3406B INDUSTRIAL AND MARINE ENGINES Caterpillar


Testing And Adjusting

Usage:

Troubleshooting

Troubleshooting can be difficult. The TROUBLESHOOTING INDEX gives a list of possible problems. To make a repair to a problem, make reference to the cause and correction on the pages that follow.

This list of problems, causes, and corrections will only give an indication of where a possible problem can be, and what repairs are needed. Normally, more or other repair work is needed beyond the recommendations in the list.

Remember that a problem is not normally caused only by one part, but by the relation of one part with other parts. This list is only a guide and cannot give all possible problems and corrections. The serviceman must find the problem and its source, then make the necessary repairs.

Troubleshooting Index

1. Engine Crankshaft Will Not Turn When Start Switch Is On.
2. Engine Will Not Start.
3. Engine Misfires or Runs Rough.
4. Stall at Low rpm.
5. Sudden Changes In Engine rpm.
6. Not Enough Power.
7. Too Much Vibration.
8. Loud Combustion Noise.
9. Valve Train Noise (Clicking).
10. Oil In Cooling System.
11. Mechanical Noise (Knock) In Engine.
12. Fuel Consumption Too High.
13. Loud Valve Train Noise.
14. Too Much Valve Lash.
15. Valve Rotocoil or Spring Lock is Free.
16. Oil at the Exhaust.
17. Little or No Valve Clearance.
18. Engine Has Early Wear.
19. Coolant in Lubrication Oil.
20. Too Much Black or Gray Smoke.
21. Too Much White or Blue Smoke.
22. Engine Has Low Oil Pressure.
23. Engine Uses Too Much Lubrication Oil.
24. Engine Coolant Is Too Hot.
25. Exhaust Temperature Is Too High.
26. Starter Motor Does Not Turn.
27. Alternator Gives No Charge.
28. Alternator Charge Rate Is Low or Not Regular.
29. Alternator Charge Is Too High.
30. Alternator Has Noise.
31. Rack Solenoid Does Not Stop Engine.

Engine Crankshaft Will Not Turn When Start Switch Is On

Engine Will Not Start

Engine Misfires Or Runs Rough

Stall At Low RPM

Sudden Changes In Engine Speed (rpm)

Not Enough Power

Too Much Vibration

Loud Combustion Noise (Sound)

Valve Train Noise (Clicking)

Oil In Cooling System

Mechanical Noise (Knock) In Engine

Fuel Consumption Too High

Loud Valve Train Noise

Too Much Valve Lash

Valve Rotocoil Or Spring Lock Is Free

Oil At the Exhaust

Little Or No Valve Clearance

Engine Has Early Wear

Coolant In Lubrication Oil

Too Much Black Or Gray Smoke

Too Much White Or Blue Smoke

Engine Has Low Oil Pressure

Engine Uses Too Much Lubrication Oil

Engine Coolant Is Too Hot

Exhaust Temperature Is Too High

Starter Motor Does Not Turn

Alternator Gives No Charge

Alternator Charge Rate Is Low Or Not Regular

Alternator Charge Is Too High

Alternator Has Noise

Rack Solenoid Does Not Stop Engine

Fuel System

Either too much fuel or not enough fuel for combustion can be the cause of a problem in the fuel system. Many times work is done on the fuel system when the problem is really with some other part of the engine. The source of the problem is difficult to find, especially when smoke comes from the exhaust. Smoke that comes from the exhaust can be caused by a bad fuel injection valve, but it can also be caused by one or more of the reasons that follow:

a. Not enough air for good combustion.
b. An overload at high altitude.
c. Oil leakage into combustion chamber.
d. Not enough compression.
e. Fuel injection timing retarded.

Fuel System Inspection

A problem with the components that send fuel to the engine can cause low fuel pressure. This can decrease engine performance.

1. Check the fuel level in the fuel tank. Look at the cap for the fuel tank to make sure the vent is not filled with dirt.

2. Check the fuel lines for fuel leakage. Be sure the fuel supply line does not have a restriction or a bad bend.

3. Install a new fuel filter. Clean the primary fuel filter.

4. Remove any air that may be in the fuel system. Use the fuel priming pump to move fuel through low pressure part of the system. Fuel with the air will return to the tank through the fuel return line.

To remove air from the fuel injection lines, loosen the fuel line nuts at the through head adapter nozzles 1/2turn. Move the governor lever to the low idle position. Crank engine with the starter motor until fuel without air comes from the fuel line connections. Tighten the fuel line nuts.

NOTE: The fuel priming pump will not give enough pressure to push fuel through the orificed reverse flow check valves in the fuel injection pumps.

Fuel Transfer Pump

With the engine operating at full load speed, the fuel transfer pump moves fuel through the secondary filter and the fuel injection pump housing at approximately 240 kPa (35 psi).

To check the fuel transfer pump pressure, disconnect the fuel line (from the filter) at the fuel injection pump housing inlet (1). Install a tee at inlet (1) and connect the fuel line to the tee. Connect a pressure gauge to the tee and start the engine.


FUEL LINES
1. Fuel inlet.

Minimum fuel pressures must be 70 kPa (10 psi) at low idle and 170 kPa (25 psi) at full load speed (and engine under full load).

If the fuel pressure is not above the minimum specifications, stop the engine. Make a replacement of the primary and secondary fuel filters and check to make sure the fuel lines and hoses are not plugged or damaged.

Start the engine and again check the fuel pressure. If the fuel pressure is not above the minimum specification, a repair or replacement of the fuel transfer pump is needed.

Checking Engine Cylinders Separately

An easy check can be made to find the cylinder that runs rough (misfires) and causes black smoke to come out of the exhaust pipe.

Run the engine at the speed that is the roughest. Loosen the fuel line nut at a fuel injection pump. This will stop the flow of fuel to that cylinder. Do this for each cylinder until a loosened fuel line is found that makes no difference in engine performance. Be sure to tighten each fuel line nut after the test before the next fuel line nut is loosened. Check each cylinder by this method. When a cylinder is found where the loosened fuel line nut does not make a difference in engine performance, test the injection pump and fuel injection nozzle for that cylinder.

Temperature of an exhaust manifold port, when an engine runs at low idle speed, can also be an indication of the condition of a fuel injection nozzle. Low temperature at an exhaust manifold port is an indication of no fuel to the cylinder. This can possibly be an indication of a nozzle with a defect. Extra high temperature at an exhaust manifold port can be an indication of too much fuel to the cylinder, also caused by a nozzle with a defect.

The most common defects found with the fuel injection nozzles are:

1. Steel wire brushing of nozzle tip.
2. Orifice wear.


NOTICE

Do not test nozzles unless you have the correct service tools.


Testing Fuel Injection Nozzles

5P4150 Nozzle Testing Group.
5P4244 Adapter.
8S2270 Fuel Collector.FT1384 Extension.8S2245 Cleaning Kit.
8S2258 Brass Wire Brush.6V4979 Carbon Seal Installation Tool.
1F1153 Needle Nose Pliers.6V4980 Torque Driver.*FT1743 Line Assembly.6V6068 Calibration Fluid 19 liters (5 U.S. gal.) or6V6067 Calibration Fluid 208 liters (55 U.S. gal.)

NOTE: FT1743 is a standard fuel line used between the through head adapter and the nozzle. Bend the line to position nozzle in a vertical position in the extension and collector.


*

NOTE: For more information on the 5P4150 Nozzle Testing Group, see Special Instruction Form No. SEHS7292.


5P4150 Nozzle Testing Group
1. Nozzle assembly. A. FT1743 Line Assembly. B. 5P4244 Adapter. C. 5P4721 Tube Assembly. D. 2P2324 Gauge 0 to 34 500 kPa (0 to 5000 psi). E. 5P4146 Gauge 0 to 6900 kPa (0 to 1000 psi). F. Gauge protector valve for 2P2324 Gauge. G. FT1384 Extension and 8S2270 Fuel Collector. H. Gauge protector valve for 5P4146 Gauge. J. Gauge protector valve (must be in the open position at all times).


5P4150 NOZZLE TESTING GROUP
K. Pump isolator valve. L. On-Off valve.


NOTICE

Be sure to use clean SAE J967 Calibration Fluid when tests are made. Dirty test fluid will damage components of fuel injection nozzles. The temperature of the test fluid must be 18 to 24° C (65 to 75° F) for good test results.


Nozzle Preparation for Test

Remove seal (3) and carbon dam (2) from the nozzle. Before fuel injection nozzle (1) can be tested, all loose carbon around the tip of the nozzle must be removed with the 8S2258 Brass Wire Brush (M).


REMOVING CARBON DAM
1. Fuel injection nozzle. 2. Carbon dam. 3. Seal.


NOTICE

Do not use a steel brush or a wire wheel to clean the nozzle body or the nozzle tip. Use of these tools can cause a large reduction in engine horsepower. Too much use of the 8S2258 Brass Wire Brush will also remove the coating that is on the nozzle for protection.



8S2245 CLEANING KIT
M. 8S2258 Brass Wire Brush. N. 6V4979 Carbon Seal Tool. P. 8S2250 Nozzle Holding Tool.

Clean the groove for carbon seal dam (2) and the body of the nozzle below the groove with the 8S2258 Brass Wire Brush (M). Remove the carbon, but be sure not to use the brush enough to cause damage to the body of the nozzle.

NOTE: A change in color in the area below the groove is normal and does not effect the body of the nozzle.


FUEL INJECTION NOZZLE SHOWN
4. Bleed screw and seal.

Remove bleed screw and seal (4) from the nozzle.

NOTE: The bleed screw and seal must be removed for all tests except test V; Bleed Screw Leakage Test.

Test Sequenc

NOTE: It is necessary to have an accurate record of the test results for each nozzle that is tested. Make a record of the result for each nozzle test procedure on Form No. SEHS8144, NOZZLE TEST RECORD. These test sheets are available in a pad of 50 sheets, order one Form SEHS8144.

The fuel injection nozzle cannot be disassembled for cleaning or adjustment. Do the tests that follow to determine if the nozzle performance is acceptable.

I. Valve Opening Pressure Test.
II. Flush the Nozzle.
III. Tip Leakage Test.
IV. Orifice Restriction Test.
V. Bleedscrew Leakage Test.

------ WARNING! ------

When fuel injection nozzles are tested, be sure to wear eye protection. Test fluid comes from the orifices in the nozzle tip with high pressure. The test fluid can pierce (go through) the skin and cause serious injury to the operator. Keep the tip of the nozzle pointed away from the operator and into the 8S2270 Collector and FT1384 Extension.

--------WARNING!------

I. Valve Opening Pressure Test (VOP)

1. Install 5P4721 Tube Assembly (C), 5P4244 Adapter and FT1743 Line Assembly on the tester.

2. Install the fuel injection nozzle on tube (A). Be sure the nozzle is inside FT1384 Extension (G) and 8S2270 Fuel Collector.


NOZZLE READY FOR TEST
F. Gauge protector valve. L. On-off valve. K. Pump isolator valve.


NOTICE

Put a shop towel around the upper part of the nozzle to take in any fuel leakage.


3. Close on-off valve (L). Open pump isolator valve (K).

4. Open gauge protector valve (F). Operate the pump to make a slow increase in pressure until the valve in the fuel injection nozzle just starts to open. Read the maximum gauge pressure at the instant fluid flows from the tip.

NOTE: It is possible for the pressure reading of the gauge to go down fast if the valve makes a noise (chatters) when it opens. It is also possible for the pressure reading of the gauge to be almost constant when the valve in the fuel injection nozzle opens.

NOTE: The valve in the fuel injection nozzle can be good and still not make noise (chatter), or not have a very fine vapor (spray) from the orifices in the tip of the fuel injection nozzle during Step 4.

If the opening pressure is not within specifications, do not use the fuel injection nozzle again.

II. Flush The Nozzle

1. Close gauge protector valve (F). Close on-off valve (L). Open pump isolator valve (K).

NOTE: Make sure nozzle extends inside and below the top of FT1384 Extension (G).

2. Operate the pump rapidly for three full strokes.

III. Tip Leakage Test

1. Remove all fuel from the nozzle tip and body with a clean cloth.

2. Put a clean cloth around the body of the nozzle to take in any leakage from the bleed screw hole and prevent any fuel leakage to drain down to the tip of the nozzle.


NOZZLE READY FOR TEST
F. Gauge protector valve. L. On-off valve. K. Pump isolator valve.

3. Open gauge protector valve (F). Close on-off valve (L). Open pump isolator valve (K).

4. Make and hold for 15 seconds a pressure of 1380 kPa (200 psi) less than the opening pressure measured in VOP Test 1 and make a note of the number of drops that fall.

5. If the nozzle is not within specifications, DO NOT USE THE NOZZLE.

IV. Orifice Restriction Test

1. Close gauge protector valve (F) and on-off valve (L). Open pump isolator valve (K).

2. Point the tip of the fuel injection nozzle into the 8S2270 Fuel Collector and FT1384 Extension (G).

3. Make a rapid increase in pressure and look at the orifice discharge (shape of discharge).

The discharge must be the same through all six orifices. Any change either vertically or horizontally, is an indication of a bad nozzle.


GOOD NOZZLE (USE AGAIN)


TYPICAL DISCHARGE FOR ORIFICE WITH A RESTRICTION (REPLACEMENT NECESSARY)


TYPICAL DISCHARGE WITH HORIZONTAL DISTORTION (REPLACEMENT NECESSARY)


TYPICAL DISCHARGE WITH VERTICAL DISTORTION (REPLACEMENT NECESSARY)


BLEED SCREWS FOR FUEL INJECTION NOZZLE

V. Bleed Screw Leakage Test

1. Install bleed screw and seal (4) in fuel injection nozzle. Tighten type (A) bleed screws to 0.9 ± 0.1 N·m (8 ± 1 lb.in.). Tighten type (B) or (C) bleed screw to 1.8 ± 0.2 N·m (16 ± 2 lb.in.). Use the 6V4980 Torque Screwdriver to tighten the bleed screws to the correct torque.


NOTICE

Do not tighten the bleed screw more than the torque shown. The bleed screw or seal can be damaged.


2. Put the tip of the fuel injection nozzle down inside the 8S2270 Fuel Collector and FT1384 Extension (G).

3. Close on-off valve (L). Open gauge protector valve (F) and pump isolator valve (K).

4. Pump the tester until fuel injection nozzle is full of fluid and the pressure on the gauge is 20 700 kPa (3000 psi).

NOTE: 15 or 20 strokes of the pump can be necessary for the pressure to get to 20 700 kPa (3000 psi).

5. If there is leakage, replace the sealing washer. Inspect the washer face of the bleed screw for damage, install a new screw if necessary. Test the nozzle again. If there is still leakage, the fuel injection nozzle must be replaced.


INSTALLING CARBON DAM
2. Carbon dam. 3. Seal. N. 6V4979 Carbon Seal Tool.

6. If no fuel leakage is found, the fuel injection nozzle is acceptable. Put a new seal (3) on the nozzle. Install a new carbon dam (2) in nozzle groove with 6V4979 Carbon Seal Tool (N).

Fuel Injection Lines

Fuel from the fuel injection pumps goes to the fuel injection nozzles through the fuel injection lines.

When fuel injection lines are disconnected or removed, always put caps or plugs on the ends to keep dirt out of the lines. When fuel injection lines are installed, be sure all clamps and dampers are installed in their original location.

------ WARNING! ------

Fuel injection lines which are bent, damaged or rubbing can leak and cause a fire. Replace any lines which have damage or leaks that cannot be corrected when tightened to the correct torque.

--------WARNING!------

The nuts that hold a fuel injection line to an injection nozzle and injection pump must be tightened to the correct torque. If the nut is loose, fuel will leak from the connection. If the nut is tightened too tight, the inside diameter of the line will become smaller and cause a restriction to the flow of fuel in the line. Use a torque wrench and a 5P144 Fuel Line Socket to tighten the fuel injection line nuts to 40 ± 7 N·m (30 ± 5 lb.ft.)

------ WARNING! ------

Be sure the fuel injection line clamps are installed in the correct location. Incorrectly installed clamps may allow the fuel injection lines to vibrate and become damaged. The damaged lines may leak and cause a fire.

--------WARNING!------


FUEL INJECTION LINES
1. A vertical line through the number one injection pump.

Checking The Plunger And Lifter Of An Injection Pump

NOTE: There are no different size spacers available to adjust the timing dimension of the fuel injection pumps. If the pump plunger or the lifter is worn, they must be replaced. Because there is no adjustment to the timing dimension possible, there is NO OFF ENGINE LIFTER SETTING PROCEDURE.

When there is too much wear on the fuel injection pump plunger, the lifter may also be worn and there will not be good contact between the two parts. To stop fast wear on the end of a new plunger, install new lifters in the place of the lifters that have wear.


WEAR BETWEEN LIFTER AND PLUNGER
Fig. A. Illustrates the contact surfaces of a new pump plunger and a new lifter. In Fig. B the pump plunger and lifter have worn considerably. Fig. C shows how the flat end of a new plunger makes poor contact with a worn lifter, resulting in rapid wear to both parts.

An injection pump can have a good fuel flow coming from it but not be a good pump because of slow timing that is caused by wear on the bottom end of the plunger. When making a test on a pump that has been used for a long time, use a micrometer and measure the length of the plunger. If the length of the plunger is shorter than the minimum length (worn) dimension given in the chart, install a new pump.

Look for wear at the top part of the plunger. Check the operation of the plunger according to the instructions for the Fuel Injection Test Bench.

Removal And Installation Of Fuel Injection Pumps

8T5287 Wrench.8S2244 Extractor.6V4186 Timing Pin.6V7050 Compressor Group.

Before the 6V7050 Compressor Group is used for the first time, or if the group has been disassembled, make the following adjustment:

1. An injection pump that is to be used for this adjustment (or one that is to be removed or installed) must have another injection pump installed next to it. The second injection pump serves as the compressor mounting stud. If there are not two injection pumps next to each other, install two injection pumps without the lifter springs. See INSTALLATION OF FUEL INJECTION PUMPS for the correct alignment of the pump at assembly.


ADJUSTMENT OF 6V7050 COMPRESSOR GROUP
A. 6V7015 Clamp. B. Bracket assembly. C. 4B2046 Nut. D. 5M7418 Nut. E. 2N3476 Screw.

2. Put bracket assembly (B) over one of the pump bonnets.

3. Put the clamp ram on the center of the other injection pump bonnet with screw (E) in contact with the fuel line seat.

NOTE: The 6V7015 Clamp (A) should not be locked down.

4. Install and tighten nut (D).

5. Adjust screw in or out until the top of bracket assembly (B) just starts to move when the clamp ram is locked down.

6. Tighten nut (C) to hold screw (E) in position.

Removal of Fuel Injection Pumps


NOTICE

Before any parts are removed from the fuel injection pump housing, thoroughly clean all dirt from the housing. Dirt that gets inside the pump housing will cause much damage.


NOTE: The fuel rack must be in the center position before the fuel injection pumps can be removed or installed. Follow Steps 1 through 3.

1. Remove the plug from the injection pump housing timing pin hole.


FUEL INJECTION PUMP HOUSING
1. 6V4186 Timing Pin. 2. 8T5287 Wrench. 3. 6V7050 Compressor Group. 4. Retainer housing.

2. Move the governor lever to the SHUTOFF position and install timing pin (1) as shown.

3. With the timing pin in position, move the governor lever to the high idle position. The fuel rack makes contact with the timing pin. The fuel rack is now in the center position. Fasten the governor lever in the HIGH IDLE position.

4. Remove the fuel injection line from the pump to be removed and also the fuel injection lines on each side of the pump to be removed.

------ WARNING! ------

There is spring force on the fuel injection pump plunger and barrel assembly. Removal of retainer bushing (4) without the 6V7050 Compressor Group correctly installed can cause bodily injury.

--------WARNING!------

5. Use 8T5287 Wrench (2) to loosen bushing (4) one quarter turn. Do not remove the bushing at this time.

6. Install 6V7050 Compressor Group (3) on the pump housing over 8T5287 Wrench (2). Lower the screw in the compressor ram to the fuel line seat before the nut is tightened to hold the compressor group in position. This centers the compressor group.


FUEL INJECTION PUMP HOUSING
1. 6V4186 Timing Pin. 2. 8T5287 Wrench. 3. 6V7050 Compressor Group. 4. Retainer housing.

7. Use 8T5287 Wrench (2) to loosen retainer bushing (4) until it is out of the threads. Slowly raise the compressor tool handle to release the spring force.


FUEL INJECTION PUMP HOUSING
5. 8S2244 Extractor.

8. Remove the 6V7050 Compressor Group and the 8T5287 Wrench. Install 8S2244 Extractor (5) on the injection pump threads. Carefully pull the pump straight up and out of the pump housing bore. Remove the spacer from the pump housing bore.

Be careful when an injection pump is disassembled. Do not damage the surface on the plunger. The plunger and barrel are made as a set. Do not put the plunger of one pump in the barrel of another pump. If one part is worn, install a complete new pump assembly. Be careful when the plunger is put into the bore of the barrel. When injection pumps are removed from the fuel injection pump housing, keep the parts together so they can be installed in the same location in the housing.

Installation of Fuel Injection Pumps


NOTICE

The fuel rack MUST BE IN THE CENTER POSITION before the correct installation of an injection pump is possible.


1. Put the fuel rack in the center position. Make reference to Removal of Fuel Injection Pumps.


FUEL INJECTION PUMP INSTALLATION
1. 8S2244 Extractor. 2. Pump barrel. 3. Gear segment.

2. Put 8S2244 Extractor (1) on the threads of the fuel injection pump.

3. Make sure the lifter for the pump to be installed is at the bottom of its travel (cam lobe is at its lowest point).

4. Put the groove in barrel (2) in alignment with the slot (groove) in gear segment (3).

5. Be sure the spacer is in position in the pump housing bore.


FUEL INJECTION PUMP HOUSING (TOP VIEW)
4. Pin. 5. Dowel

6. Carefully install the pump straight down into the pump housing bore.

NOTE: The slot (groove) in gear segment (3) must be in alignment with pin (4) in the side of the lifter and the groove in barrel (2) must be in alignment with dowel (5) in the housing bore.


FUEL INJECTION PUMP HOUSING
6. 6V4186 Timing Pin. 7. 8T5287 Wrench. 8. 6V7050 Compressor Group. 9. Retainer bushing.

7. Remove the 8S2244 Extractor. Put the O-ring seal, retainer bushing (9) and 8T5287 Wrench (7) in position on the top of the injection pump. Install 6V7050 Compressor Group (8).

8. Slowly move the handle of the 6V7050 Compressor Group down to push the injection pump into the bore.


NOTICE

The handle of the 6V7050 Compressor Group must move smoothly down to the lock position. Do not force the handle if it stops. If the handle does not move smoothly down to the lock position, raise the handle, remove the 6V7050 Compressor Group, and repeat Steps 3 through 8.


9. Put the O-ring seal in position in the pump housing bore. Use the 8T5287 Wrench to install the retainer bushing.

10. Remove the 6V7050 Compressor Group. Tighten the retainer bushing to 215 ± 15 N·m (160 ± 11 lb.ft.).


NOTICE

The bushing must be tightened to the correct torque. Damage to the housing will be the result if the bushing is too tight. If the bushing is not tight enough, the pump will have leakage.


11. Install the fuel injection lines to the pump and tighten to 40 ± 7 N·m (30 ± 5 lb.ft.). See Fuel Injection Lines in this section.

------ WARNING! ------

Be sure the fuel injection line clamps are installed in the correc locations. Incorrectly installed clamps may allow the fuel injection lines to vibrate and become damaged. The damaged lines may leak and cause a fire.

--------WARNING!------

12. Remove 6V4186 Timing Pin (6) from the fuel injection pump housing and install the plug.


NOTICE

If one or more of the fuel injection pumps have been installed wrong, it is possible for the engine to run out of control when started. When any of the fuel injection pumps have been removed and installed with the fuel injection pump housing on the engine, take the precautions (steps) that follow to stop the engine if it starts to overspeed (run out of control).


a. Remove the air cleaner pipe from the turbocharger leaving the air inlet open as shown.


TURBOCHARGER AIR INLET OPENING

b. Set the governor control at low idle.

------ WARNING! ------

Be careful when plate is put against air inlet opening. Due to excessive suction, the plate can be pulled quickly against air inlet opening. To avoid crushed fingers, do not put fingers between plate and air inlet opening.

--------WARNING!------

c. Start the engine, and if engine starts to overspeed (run out of control), put a steel plate over the air inlet as shown to stop the engine.


STOPPING THE ENGINE

Finding Top Center Compression Position For No. 1 Piston

9S9082 Turning Tool.

No. 1 piston at top center (TC) on the compression stroke is the starting point of all timing procedures.

NOTE: On some engines there are two threaded holes in the flywheel. These holes are in alignment with the holes with plugs in the left and right front of the flywheel housing. The two holes in the flywheel are at a different distance from the center of the flywheel so the timing bolt cannot be put in the wrong hole.


LOCATING TOP CENTER (LEFT SIDE OF ENGINE)
1. Timing bolt. 2. Timing bolt location. 3. Storage location.

1. The timing bolt (1) is kept in storage at location (3) and can be installed in either the left side of the engine at location (2) or in the right side of the engine at location (4). Remove bolts and cover from flywheel housing. Remove the plug from the timing hole in the flywheel housing.


LOCATING TOP CENTER (RIGHT SIDE OF ENGINE)
4. Timing bolt location.

2. Put timing bolt (1) [long bolt that holds cover on the flywheel housing] through the timing hole in the flywheel housing. Use the 9S9082 Engine Turning Tool and 1/2" drive ratchet wrench to turn the engine flywheel in the direction of normal engine rotation until the timing bolt engages with the threaded hole in the flywheel.


USING 9S9082 ENGINE TURNING TOOL
1. Timing bolt. 5. 9S9082 Engine Turning tool.

NOTE: If the flywheel is turned beyond the point that the timing bolt engages in the threaded hole, the flywheel must be turned opposite normal engine rotation approximately 30 degrees. Then turn the flywheel in the direction of normal rotation until the timing bolt engages with the threaded hole. The reason for this procedure is to make sure the play is removed from the gears when the No. 1 piston is put on top center.

3. Remove the front valve cover from the engine.


CHECKING NO. 1 INTAKE AND EXHAUST VALVES

4. The intake and exhaust valves for the No. 1 cylinder are closed if No. 1 piston is on the compression stroke and the rocker arms can be moved by hand. If the rocker arms cannot be moved and the valves are slightly open the flywheel must be turned again. Remove the timing bolt and turn the flywheel in the direction of normal engine rotation 360 degrees until the timing bolt can be installed. The No. 1 piston is now in the top center compression position.

Checking Engine Timing And Timing Advance With 6V3100 Engine Timing Indicator Group

6V3100 Engine Timing Indicator Group.6V6070 Governor Adjusting Tool Group.


6V3100 Engine Timing Indicator Group
1. Engine timing indicator. 2. TDC magnetic transducer. 3. Transducer adapter (6V3093-1/4" NPTF or 6V2199-1/8" NPTF). 4. Injection transducer. 5. 5P7437 Adapter. 6. 5P7435 Tee Adapter. 7. 5P7436 Adapter.

When checking the dynamic timing on an engine that has a mechanical advance, Caterpillar recommends that the serviceman calculate and plot the dynamic timing specifications first on a worksheet like Form No. SEHS8140. These worksheets are available in pads of 50 sheets, order one Form No. SEHS8140. See Special Instruction, Form No. SEHS7742 for information required to calculate the timing curve. For the correct timing specifications to use, see the ENGINE INFORMATION PLATE for the performance specification (OT) number and make reference to the FUEL SETTING AND RELATED INFORMATION FICHE.

NOTE: For more information on acceptable tolerances for dynamic fuel injection timing, see Service Magazines dated 4-1-85 and 10-28-85.

After the timing values are calculated and plotted, the dynamic timing should be checked with the 6V3100 Engine Timing Indicator Group. To do this, the serviceman must operate the engine from 1000 rpm (base rpm) to high idle and from high idle to 1000 rpm (base rpm). Unstable readings are often obtained below 1000 rpm. He must record the dynamic timing at each 100 rpm and at the specified speeds during both acceleration and deceleration. Then he should plot the results on the worksheet.

Inspection of the plotted values will show if the fuel injection timing is within specification and if it is advancing correctly.

1. Make reference to Operation Instructions inside the lid of the 6V3100 Engine Timing Indicator (1) or Special Instruction Form No. SEHS7742 for complete instructions and calibration.

------ WARNING! ------

A high pressure fuel line must be disconnected. To avoid personal injury or fire from fuel spray, the engine must be stopped before the fuel line is disconnected.

--------WARNING!------


TRANSDUCER IN POSITION
4. Injection transducer. 8. Fuel injection line for No. 6 cylinder.

2. Loosen all fuel line clamps that hold No. 1 or No. 6 fuel injection line and disconnect the fuel injection line for the No. 1 or No. 6 cylinder at the fuel injection pump. Slide the nut up and out of the way. Put 5P7436 Adapter (7) in its place and turn adapter (7) onto the fuel pump bonnet until the top of the bonnet threads are approximately even with the bottom of the "window" in the adapter.

3. Put the 5P7435 Tee Adapter (6) on the injection transducer (4) and put the end of the 5P7435 Tee Adapter (6) on the "window" of the 5P7436 Adapter (7).

4. Put fuel injection line (8) on top of 5P7435 Tee Adapter (6). Install 5P7437 Adapter (5) and tighten to 40 N·m (30 lb.ft.).

5. Remove the plug from timing hole in the flywheel housing. Install transducer adapter (3) into the hole the plug was removed from. Tighten only a small amount.


TRANSDUCER IN POSITION
2. TDC magnetic transducer.

6. Push TDC magnetic transducer (2) into the transducer adapter (3) until it makes contact with the flywheel. Pull it back out 1.6 mm (.06 in.) and lightly tighten the knurled locknut.

7. Connect the cables from the transducers to the Engine Timing Indicator. Make a calibration check of the indicator. For calibration procedure, make reference to Special Instruction Form No. SEHS7742.

8. Start the engine and let it reach operating temperature. Then run the engine at approximately one-half throttle for eight to ten minutes before measuring timing.

9. Run the engine at 100 rpm speed increments between 1000 rpm (base rpm) and high idle. (Smaller increments may be needed to define the point where timing advance starts and stops). Record and plot the engine timing indicator readings on the worksheet (on which the calculated timing has been plotted).

10. No adjustment or repair is needed under the following conditions:

a. If the measured timing is within the tolerance zone of the calculated timing.
b. If the timing advance begins and ends within the START and STOP rpm windows.
c. If the advance curve is smooth.

11. An adjustment or repair is needed under the following conditions.

a. If measured timing is not within the tolerance zone.
b. If the advance curve is not smooth.

12. If the dynamic timing at 1000 rpm (base rpm) is outside the tolerance zone, check static timing. Make reference to CHECKING ENGINE BY TIMING PIN METHOD for static adjustment of the fuel injection pump drive. If the timing advance is not correct, do the steps that follow to make an adjustment.


FRONT OF ENGINE
9. Access cover for automatic timing advance (governor and fuel pump drive group).

13. Stop the engine and remove cover (9).


AUTOMATIC TIMING ADVANCE UNIT (GOVERNOR AND FUEL PUMP DRIVE GROUP)
10. Locknut. 11. Screw. 12. Locknut. 13. Setscrew.

14. To adjust the speed where the fuel injection timing starts to advance, loosen locknut (10) and turn screw (11). Turn screw (11) clockwise to increase the speed where the timing advance starts. One turn of screw (11) will change START speed approximately 50 rpm. Tighten locknut (10) to a torque of 70 ± 15 N·m (50 ± 11 lb.ft.).


ADJUST SPEED WHERE ADVANCE STOPS
14. 6V2106 Tool Group.

NOTE: If the speed where timing advance starts is adjusted, the speed where the automatic timing advance stops should also be adjusted.

15. To adjust the speed where the fuel injection automatic timing advance stops, loosen locknut (12) and turn setscrew (13). Turn setscrew (13) clockwise to decrease the stop speed. One turn of setscrew (13) will change STOP speed approximately 30 rpm. Tighten locknut (12) to a torque of 2.25 ± 0.25 N·m (20 ± 2 lb.in.). 6V2106 Tool Group (14) [part of 6V6070 Governor Adjusting Tool Group] can be used to make this adjustment.

16. After each adjustment, install cover (9) and recheck the automatic timing advance with the 6V3100 Timing Indicator Group.

17. If the automatic timing advance unit cannot be adjusted to operate within the correct range, or the operation of the unit is not smooth, repair or replace the automatic timing and advance unit (governor and fuel pump drive group).

Checking Engine Timing By Timing Pin Method

9S9082 Engine Turning Tool.6V4186 Timing Pin.

1. Put No. 1 piston at top center on the compression stroke. Make reference to FINDING TOP CENTER COMPRESSION POSITION FOR NO. 1 PISTON. Remove the timing bolt from the flywheel and use 9S9082 Engine Turning Tool to rotate the crankshaft clockwise 45° as seen from the flywheel end of the engine.


FUEL INJECTION PUMP
1. Plug (timing pin hole).

2. Remove plug (1) from the fuel injection pump housing.


TIMING PIN INSTALLED
2. 6V4186 Timing Pin.

3. Install 6V4186 Timing Pin (2) in the fuel injection pump housing as shown. Slowly rotate the crankshaft counterclockwise (as seen from the flywheel end of the engine) until timing pin (2) goes into the slot in the fuel pump camshaft.


NOTICE

Too much pressure on the timing pin can damage the fuel injection pump or the timing pin.


4. Put the timing bolt in the timing hole in the flywheel housing. Rotate the crankshaft counterclockwise (as seen from the flywheel end of the engine) until the fuel pump camshaft is tight against timing pin (2). This removes gear clearance from the drive train. If the bolt can be installed in the timing hole in the flywheel, the timing of the fuel injection pump is correct.

5. If the timing bolt does not go into the timing hole in the flywheel, the timing is not correct. Do the steps that follow to adjust the fuel injection pump timing.


FRONT OF ENGINE
3. Access cover for automatic timing advance (governor and fuel pump drive group).

a. Remove cover (3).


AUTOMATIC TIMING ADVANCE UNIT (GOVERNOR AND FUEL PUMP DRIVE GROUP)
4. Bolts.

b. Loosen four bolts (4). With timing pin (2) installed and the timing bolt removed, turn the flywheel clockwise (opposite the direction of engine rotation) a minimum of 45°. The reason for this step is to remove play from the timing gears when the engine is put on top center (TC).

c. Tighten two bolts (4) 180° apart, evenly to a torque of 3 N·m (27 lb.in.). This puts a slight clamping force on the gear for the next step.

d. Turn the flywheel slowly in the direction of engine rotation until the timing bolt can be installed in the flywheel. The number one piston of the engine is now at top center (TC).

e. Tighten four bolts (4) to a torque of 55 ± 7 N·m (41 ± 5 lb.ft.). Remove the timing bolt from the flywheel and timing pin (2) from the fuel injection pump housing.

6. Turn the flywheel clockwise (opposite the direction of normal engine rotation) a minimum of 45°. Now, turn the flywheel in the direction of engine rotation until timing pin (2) drops into slot of pump camshaft. Now turn the flywheel more, in the direction of normal engine rotation, until all gear clearance is removed from the drive train. Check to see that the timing bolt will go into the flywheel.

7. If the timing is not correct, do the procedure of Steps 5b through 5e again.

8. If the timing is correct, remove the timing bolt from the flywheel and the timing pin from the fuel injection pump housing. Install cover (3) and plug (1).

Fuel Setting Procedure

6V6070 Governor Adjusting Tool Group.8T500 Circuit Tester.


6V6070 GOVERNOR ADJUSTING TOOL GROUP

The fuel setting procedure can be used with the fuel injection pump and governor on or off the engine.


FUEL INJECTION PUMP AND GOVERNOR
1. Cover (rack position indicator). 2. Plug (rack centering pin).

1. Remove plug (2) and cover (1) from the fuel injection pump housing.


INDICATOR AND CENTERING PIN INSTALLED
3. 6V4186 Timing Pin. 4. 6V6109 Bracket Assembly. 5. 2A0762 Bolt [1/4-20 NC × 15.88 mm long (.625 in. long)]. 6. 8H9178 Ground Body Bolt [1/4-20 NC × 25.4 mm long (1.00 in. long)]. 7. 5P4814 Collet. 8. 6V6106 Dial Indicator.

2. Install the rack position indicator as follows:

a. Install the 5P4814 Collet (7) on the 6V6109 Bracket Assembly (4).

b. Position the indicator arm in approximately the middle of its travel to make sure that it will engage in slot (9) in the rack. Put 6V6109 Bracket Assembly (4) in position on the fuel injection pump housing.


SLOT IN FUEL INJECTION PUMP RACK
9. Slot.

c. Install 8H9178 Ground Body Bolt (6) first. Then install 2A0762 Bolt (5).

d. Be sure the indicator arm moves freely.

e. Put indicator (8) in position in collet (7).

f. Put the 9S8903 Contact Point on the 6V2030 Extension and install on indicator (8).

NOTE: The 9S8903 Contact Point will not go through the collet and must be assembled after the indicator stem has passed through the collet.

g. Tighten collet (7) just enough to hold the dial indicator.

3. Remove the shutoff solenoid, if so equipped, or cover and install the 6V6151 Adapter (10).


POSITION FUEL INJECTION PUMP RACK
10. 6V6151 Adapter. 11. 6V7942 Hook.

4. Move the governor control lever to the "LOW IDLE" position (rotate governor shaft counterclockwise).

5. Install the 6V4186 Timing Pin (3) in the top of the fuel injection pump housing. Push the timing pin in until contact with the fuel rack is made.

6. Use 6V7942 Hook (11) through 6V6151 Adapter (10) to push the sleeve and rack to the "SHUTOFF" position. Make sure timing pin (3) engages in slot (9).


PUSH RACK TO SHUTOFF
11. 6V7942 Hook. 12. Servo valve.

7. Move the governor control lever to the "FULL LOAD" position (rotate governor shaft clockwise) and fasten it in this position.


PULL RACK AGAINST TIMING PIN
11. 6V7942 Hook. 12. Servo valve.

8. Use the 6V7942 Hook (11) to pull the sleeve and rack [through servo (12)] against the timing pin.


FUEL RACK AGAINST TIMING PIN

9. Adjust the 6V6106 Dial Indicator (8) in the collet to zero and tighten the collet. Make sure all needles of the indicator are on zero.

10. Remove the 6V4186 Timing Pin (3), 6V7942 Hook and release the governor control lever.


6V7941 COMPRESSOR ASSEMBLY
13. Rod.

11. Turn rod (13) in the 6V7941 Compressor Assembly until the knob is approximately 25.4 mm (1.00 in.) away from the compressor body.

NOTE: The 6V7941 Compressor Assembly is used to compress the overfueling spring through the linkage. The overfueling spring must be compressed to get an accurate fuel setting measurement.


INSTALL THE 6V7941 COMPRESSOR ASSEMBLY
10. 6V6151 Adapter. 14. 6V7941 Compressor Assembly.

12. Install compressor assembly (14) in adapter (10) as shown.


STATIC FUEL SETTING
13. Rod (part of 6V7941 Compressor Assembly). 15. 8T500 Circuit Tester. 16. Insulated terminal.

NOTE: Some engines have a torque spring and some do not. Because of this difference, separate procedures are needed to check and adjust the fuel setting. Be sure to use the correct procedure for the fuel system that is being worked on. The FUEL SETTING AND RELATED INFORMATION FICHE has the information needed to determine which type of fuel system is on the engine.

Fuel System With a Torque Spring

1. Fasten the clip end of the 8T500 Circuit Tester (15) to insulated terminal (16) and put the other end to a good electrical ground.

2. Hold the governor control lever in the "FULL LOAD" postion (rotate governor shaft clockwise).

3. Turn rod (13) of compressor assembly in (clockwise) until the light in circuit tester (15) goes off and the dial indicator hands move an additional 2 mm in the negative (-) direction after the light goes out (2 complete revolutions of the large needle on the dial indicator).


NOTICE

DO NOT turn the rod any further in if the rod begins to tighten. Damage to the governor can occur if the rod is turned in further.


NOTE: The static fuel setting (Step 5) and the static full torque setting (Step 6) must be within ± .25 mm of the setting on the Engine Information Plate. If the setting is within ± .25 mm an adjustment is not necessary. If the Engine Information Plate is gone or the FULL TORQUE SETTING is not on the Engine Information Plate, see FUEL SETTING AND RELATED INFORMATION FICHE for the correct settings.

4. Remove adjustment screw cover (17) from the rear of the governor housing.

5. Slowly turn rod (13) out (counterclockwise) until the circuit tester light just comes on. This is the static fuel setting. See the Engine Information Plate or the FUEL SETTING AND RELATED INFORMATION FICHE for the correct static fuel setting.

NOTE: When the rod is turned out, there can be a small initial movement of the dial indicator hands, then, they will stop moving while the rod is turned out for approximately another 1 1/2 turns. Now the indicator hands will begin to move again and will follow the turning of the rod until the setting is reached. It is important that the rod be turned slowly so that the rack can follow the governor components.

NOTE: If rod (13) is turned out too fast, a wrong measurement can be read on the dial indicator as the light comes on. Repeat Steps 3 and 5 to make sure the correct measurement is taken.

6. Continue to turn the rod out until the indicator hand stops moving. Then turn the rod out two additional turns. Push in on the rack stop collar to make sure it is in the correct position. The new reading on the indicator is the full torque static setting.

Example: Static Fuel Setting = 2.18 mm

Example: Full Torque = 3.18 mm

This means the torque rise setting is 1.00 mm. An addition of the fuel setting and the torque rise setting is not necessary.

7. See the FUEL SETTING AND RELATED INFORMATION FICHE for the correct static full torque setting. On later engines the full torque static setting is on the Engine Information Plate.

8. Determine how much the settings will have to be changed (see examples). Use the chart that follows to determine how far the adjusting screws must be turned.


ADJUSTMENT OF GOVERNOR
17. Adjustment screw cover.

Example #1

Since "desired setting" is higher than "actual reading," turn adjusting screw out (counterclockwise) approximately 1/4 turn. Recheck the new setting and readjust if necessary.

Example #2

Since "desired setting" is lower than "actual reading," turn the adjusting screw in (clockwise) approximately 1 1/8 turns. Recheck the new setting and readjust if necessary.

Example #3

Negative numbers work differently than positive numbers. If one number (-1.25) has a larger digital value than another one (-1.05), the first number (-1.25) is actually less than the other one. Therefore, in this example the 'desired setting" is lower than the "actual reading." Turn the adjusting screw in (clockwise) approximately 1/4 turn. Recheck the new setting and readjust if necessary.

Example #4

The "desired setting" is higher than the "actual reading." Turn the adjusting screw out (counterclockwise) approximately 1 1/8 turns. Recheck the new setting and readjust if necessary.

Example #5

The "desired setting" is lower than the "actual reading." Turn the adjusting screw in approximately 2 7/8turns.

Example #6

The "desired setting" is higher than the "actual reading." Turn the adjusting screw out approximately 2 7/8turns.


ADJUSTMENT OF FUEL SETTING
18. Fuel setting screw. 19. 6V2106 Rack Adjustment Tool Group.


ADJUSTMENT OF FULL TORQUE SETTING
19. 6V2106 Rack Adjustment Tool Group. 20. Torque rise setting screw.

NOTE: If you are working from the side of the engine and cannot see the adjusting screws, use the outer edge of the opening in the governor housing to guide the 6V2106 Tool Group onto the fuel setting screw. Use the inner edge of the opening to guide the 6V2106 Tool Group onto the full torque setting adjustment screw.

9. If both settings are to be increased, turn torque rise adjustment screw (20) out (counterclockwise) the same number of turns as fuel setting adjustment screw (18) is going to be changed. If the static fuel setting is going to be decreased, it is not necessary to change the full torque setting at this time.

10. Use 6V2106 Rack Adjustment Tool Group (19) to loosen the locknuts for adjustment screws and to turn the adjustment screws.

11. Adjust the fuel setting screws the number of turns determined in Step 8. Always recheck the setting after each adjustment and adjust again if needed.

NOTE: There is a zero tolerance for the fuel setting and full torque setting when an adjustment is made.

12. After the static fuel setting is correct, adjust the torque rise adjustment screw the number of turns determined in Step 8. Always recheck the setting after each adjustment and adjust again if needed.

Fuel System Without a Torque Spring

1. Fasten the clip end of the 8T500 Circuit Tester (15) to insulated terminal (16) and put the other end to a good electrical ground.

2. Hold the governor control lever in the "FULL LOAD" position (rotate governor shaft clockwise).

3. Turn rod (13) of compressor assembly in (clockwise) until the light in circuit tester (15) goes off and the dial indicator hands move an additional 2 mm in the negative (-) direction after the light goes out (2 complete revolutions of the large needle on the dial indicator).


NOTICE

DO NOT turn the rod any further in if the rod begins to tighten. Damage to the governor can occur if the rod is turned in further.


NOTE: The static fuel setting (Step 4) must be within ± .25 mm of the setting on the Engine Information Plate. If the setting is within ± .25 mm an adjustment is not necessary. If the Engine Information Plate is gone or the STATIC FUEL SETTING is not on the Engine Information Plate, see FUEL SETTING AND RELATED INFORMATION FICHE for the correct setting.

4. Slowly turn rod (13) out (counterclockwise) until the circuit tester light just comes on. This is the static fuel setting. See the Engine Information Plate or the FUEL SETTING AND RELATED INFORMATION FICHE for the correct static fuel setting.

NOTE: When the rod is turned out, there can be a small initial movement of the dial indicator hands, then, they will stop moving while the rod is turned out for approximately another 1 1/2 turns. Now the indicator hands will begin to move again and will follow the turning of the rod until the setting is reached. It is important that the rod be turned slowly so that the rack can follow the governor components.

NOTE: If rod (13) is turned out too fast, a wrong measurement can be read on the dial indicator as the light comes on. Repeat Steps 3 and 4 to make sure the correct measurement is taken.


ADJUSTMENT OF GOVERNOR
17. Adjustment screw cover.

5. If the fuel setting is not correct, remove adjustment screw cover (17) from the rear of the governor housing.

6. Determine how much the setting will have to be changed (see examples). Use the chart that follows to determine how far the adjusting screw must be turned.

Example #1

Since "desired setting" is higher than "actual reading," turn adjusting screw out (counterclockwise) approximately 1/4 turn. Recheck the new setting and readjust if necessary.

Example #2

Since "desired setting" is lower than "actual reading," turn the adjusting screw in (clockwise) approximately 1 1/8 turns. Recheck the new setting and readjust if necessary.

Example #3

Negative numbers work differently than positive numbers. If one number (-1.25) has a larger digital value than another one (-1.05), the first number (-1.25) is actually less than other one. Therefore, in this example the "desired setting" is lower than the "actual reading." Turn the adjusting screw in (clockwise) approximately 1/4 turn. Recheck the new setting and readjust if necessary.

Example #4

The "desired setting" is higher than the "actual reading." Turn the adjusting screw out (counterclockwise) approximately 1 1/8 turns. Recheck the new setting and readjust if necessary.

Example #5

The "desired setting" is lower than the "actual reading." Turn the adjusting screw in approximately 2 7/8turns.

Example #6

The "desired setting" is higher than the "actual reading." Turn the adjusting screw out approximately 2 7/8turns.


ADJUSTMENT OF FUEL SETTING
18. Fuel setting screw. 19. 6V2106 Rack Adjustment Tool Group.

NOTE: If you are working from the side of the engine and cannot see the adjusting screws, use the outer edge of the opening in the governor housing to guide the 6V2106 Tool Group onto the fuel setting screw. Use the inner edge of the opening to guide the 6V2106 Tool Group onto the full torque setting adjustment screw.

7. Use 6V2106 Rack Adjustment Tool Group (19) to loosen the locknut for the adjustment screw and to turn the adjustment screw.

8. Adjust the fuel setting screw the number of turns determined in Step 6. Always recheck the setting after each adjustment and adjust again if needed.

NOTE: There is a zero tolerance for the fuel setting when an adjustment is made.

Fuel Ratio Control And Governor Check

2W9161 Manual Shutoff Group.6V4186 Timing Pin.6V6070 Governor Adjusting Tool Group.
6V6106 Dial Indicator (metric).6V2030 Extension 12.7 mm (.50 in.) long.9S8903 Contact Point 2.4 mm (.094 in.) long.5P4814 Collet.6V6109 Bracket Assembly.2A0762 Bolt [1/4-20 NC × 15.88 mm (.625 in.) long].8H9178 Ground Body Bolt [1/4-20 NC × 25.4 mm (1.00 in.) long].

NOTE: The governor seals do not have to be cut or removed for the procedure that follows.

1. Install the rack position indicator to measure fuel rack movement. See Steps 1 and 2 in the FUEL SETTING PROCEDURE for the correct installation of the tooling.

2. Turn the engine start key "ON" to activate the shutoff solenoid. Do not start the engine at this time.

3. Move the governor control linkage to the full "FUEL ON" position and hold or fasten it in this position.

4. Install the 6V4186 Timing Pin in the rack zeroing hole near the front of the fuel injection pump housing.

5. With the governor control lever in the full "FUEL ON" position, use a 1N9954 lever and move the manual shutoff shaft slowly to the "FUEL OFF" position (counterclockwise). Watch and make sure the timing pin drops and engages with the slot in the fuel rack.

6. Release the manual shutoff shaft and zero the dial indicator. Move the dial indicator in the collet to zero and tighten the collet. Make sure all three needles of the indicator are on zero.

7. Remove the 6V4186 Timing Pin and watch the dial indicator movement. The indicator should show movement in the fuel "ON" direction. If no movement occurs, repeat Steps 4, 5 and 6 to zero the indicator.

8. Release the governor control shaft and linkage.


REMOVE BOOST LINE
1. Air line.

9. Remove air line (1) from the engine. Put plugs over the openings to keep dirt out of the system.

------ WARNING! ------

To help prevent an accident caused by parts in rotation, work carefully around an engine that has been started.

--------WARNING!------

10. Start the engine and operate it for a minimum of five minutes to get the governor and engine up to normal operating temperatures.

11. Check the leak down rate of the fuel ratio control (with the engine operating at low idle) as follows:

a. Connect a pressure gauge, a shutoff valve, a pressure regulator and an air supply to fitting (2).

b. Apply 70 kPa (10 psi) air pressure to the fuel ratio control.

c. Turn the shutoff valve "OFF" and check the leak down rate. Leakage of 20 kPa (3 psi) in 30 seconds is acceptable.

d. If leakage is more than 20 kPa (3 psi) in 30 seconds, the fuel ratio control must be repaired before Steps 13 and 14 are done.

e. Keep 70 kPa (10 psi) air pressure from the fuel ratio control for Step 12.

NOTE: Step 11 also activates the fuel ratio control for Step 12.


APPLY AIR PRESSURE
2. Fitting. 3. Cover.

NOTE: Full Rack Travel is:

a. Fuel setting on engines without a torque spring.
b. Full torque setting on engines with a torque spring.

12. From low idle, rapidly move the governor control shaft to the full "FUEL ON" position and read the measurement on the dial indicator. Read the indicator carefully because this reading will be a maximum for only a moment. Make a record of the maximum dial indicator reading. If full rack travel is not reached, increase the air pressure to make sure there is full fuel ratio control movement.

NOTE: The fuel ratio control is activated and the maximum dial indicator reading is the dynamic full rack travel of the engine. This setting of 0.5 mm (.02 in.) greater than the static settings given on the Engine Information Plate of later engines or in the FUEL SETTING AND RELATED INFORMATION FICHE.

NOTE: If the fuel ratio control is out of adjustment, the fuel ratio control can activate shortly after engine startup. At this time the dial indicator reading can be the dynamic fuel ratio control setting. Continue the checking procedure to find the dynamic full rack travel at Step 16.

13. Release all air pressure from the fuel ratio control. Start at 900 rpm and rapidly move the governor control shaft to the full "FUEL ON" position and read the measurement on the dial indicator. Read the dial indicator carefully because this reading will be a maximum for only a moment. Make a record of the maximum dial indicator reading. This is the dynamic fuel ratio control setting of the engine.

14. If the dynamic fuel ratio control setting is within ± 0.25 mm of the specification given on the Engine Information Plate or in the FUEL SETTING AND RELATED INFORMATION FICHE, an adjustment is not necessary.

15. For adjustment of the control see FUEL RATIO CONTROL ADJUSTMENT.

16. Check boost pressure that gives full rack travel, as follows:

a. Connect a pressure gauge, a pressure regulator and an air supply to fitting (2).

b. Apply 25 kPa (4 psi) air pressure to the fuel ratio control.

c. Start at 900 rpm and rapidly move the governor control shaft to the full "FUEL ON" position and make a record of the maximum dial indicator reading.

d. Repeat this procedure several times, each time increase the air pressure 5 kPa (.5 psi).

e. Make a record of the first air pressure setting that giveslfull rack travel. Full track travel was measured in Step 12.

f. This is the boost pressure that moves the fuel ratio control out of the rack control position. This pressure gives dynamic full rack travel.

Fuel Ratio Control Adjustment

2W9161 Manual Shutoff Group.6V4186 Timing Pin.6V6070 Governor Adjusting Tool Group.
6V6106 Dial Indicator (metric).6V2030 Extension 12.7 mm (.50 in.) long.9S8903 Contact Point 2.4 mm (.094 in.) long.5P4814 Collet.6V6109 Bracket Assembly.2A0762 Bolt [1/4-20 NC × 15.88 mm (.625 in.) long].8H9178 Ground Body Bolt [1/4-20 NC × 25.4 mm 1.00 in.) long].

NOTE: Before the governor seals are cut or removed, see FUEL RATIO CONTROL AND GOVERNOR CHECK to make sure an adjustment is needed.

1. See the Engine Information Plate or the FUEL SETTING AND RELATED INFORMATION FICHE for the correct dynamic fuel ratio control setting specification before an adjustment is made.

2. Install and "zero" the rack position indicator group. See FUEL RATIO CONTROL AND GOVERNOR CHECK for this procedure.


REMOVE BOOST LINE
1. Air line.

3. Remove air line (1) and cover (3) from the engine.


REMOVE COVER
2. Fitting. 3. Cover.

NOTE: Step 4 must be done to make sure that step 5 does not contact retainer (8).


ADJUSTMENT COMPONENTS
4. Nut. 5. Stop. 6. Nut. 7. Valve extension. 8. Retainer.

4. Loosen nut (4) and turn stop (5) in (clockwise) until the stop makes contact with the shoulder on retainer (8). Now turn the stop out (counterclockwise) two complete turns and tighten nut (4).

------ WARNING! ------

To help prevent an accident caused by parts in rotation, work carefully around an engine that has been started.

--------WARNING!------

5. Start the engine and operate it for a minimum of five minutes to get the governor and engine up to normal operating temperature.

6. Activate the fuel ratio control by pushing in on valve extension (7).


HOLD RETAINER IN POSITION

7. Hold retainer (8) in position and loosen nut (6). This keeps the fuel ratio control diaphragm from turning when nut (6) is loosened or tightened.


ADJUSTMENT OF FUEL RATIO CONTROL

8. Turn valve extension (7) to get the correct setting. A clockwise direction gives a more positive setting. The counterclockwise direction will give a more negative setting. Several adjustments of valve extension (7) can be needed to get the correct dynamic fuel ratio control setting.

9. After each adjustment is made, check the dynamic fuel ratio control setting. Start at 900 rpm and rapidly move the governor control shaft to the full "FUEL ON" position and read the measurement on the dial indicator. Read the dial indicator carefully because this reading will be a maximum for only a moment. Make a record of the maximum dial indicator reading.

NOTE: If the correct dynamic fuel ratio control setting cannot be made with this adjustment, the internal governor linkage must be checked and adjusted or the fuel ratio control needs repair or replacement. See CHECK AND ADJUSTMENT OF THE FUEL RATIO CONTROL LINKAGE for the governor linkage procedure.

10. After the correct adjustment has been made, tighten nut (6). Check the dynamic fuel ratio control setting again.

11. Install the gasket and cover (3) on the fuel ratio control. Tighten the bolts to a torque of 9 ± 3 N·m (7 ± 2 lb.ft.).

12. Apply 70 kPa (10 psi) air pressure to the fuel ratio control at fitting (2). This will fully extend the fuel ratio control to get dynamic full rack travel.

13. Check the dynamic full rack travel. Start at 900 rpm and rapidly move the governor control shaft to the full "FUEL ON" position and read the maximum measurement on the dial indicator.

NOTE: If the dynamic full rack travel cannot be reached, a repair or replacement of the fuel ratio control is needed.

14. Stop the engine.

15. Install the wire and seal on the fuel ratio control.

16. Install air line (1) on the engine.

17. Remove the rack position indicator tooling.

Check And Adjustment Of The Fuel Ratio Control Linkage

6V6070 Governor Adjusting Tool Group.


6V6070 GOVERNOR ADJUSTING TOOL GROUP

The check and adjustment of the fuel ratio control linkage can be used with the fuel injection pump and governor on or off the engine.

NOTE: Start with Step 13 of this procedure if the governor adjusting tools have already been installed to check the fuel setting.


FUEL INJECTION PUMP AND GOVERNOR
1. Cover (rack position indicator). 2. Plug (rack centering pin).

1. Remove plug (2) and cover (1) from the fuel injection pump housing.


INDICATOR AND CENTERING PIN INSTALLED
3. 6V4186 Timing Pin. 4. 6V6109 Bracket Assembly. 5. 2A0762 Bolt [1/4-20 NC × 15.88 mm long (.625 in. long)]. 6. 8H9178 Ground Body Bolt [1/4-20 NC × 25.4 mm long (1.00 in. long)]. 7. 5P4814 Collet. 8. 6V6106 Dial Indicator.

2. Install the rack position indicator as follows:

a. Install the 5P4814 Collet (7) on the 6V5109 Bracket Assembly (4).


SLOT IN FUEL INJECTION PUMP RACK
9. Slot.

b. Position the indicator arm in approximately the middle of its travel to make sure that it will engage in slot (9) in the rack. Put 6V6109 Bracket Assembly (4) in position on the fuel injection pump housing.

c. Install 8H9178 Ground Body Bolt (6) first. Then install 2A0762 Bolt (5).

d. Be sure the indicator arm moves freely.

e. Put indicator (8) in position in collet (7).

f. Put the 9S8903 Contact Point on the 6V2030 Extension and install on indicator (8).

NOTE: The 9S8903 Contact Point will not go through the collet and must be assembled after the indicator stem has passed through the collet.

g. Tighten collet (7) just enough to hold the dial indicator.

3. Remove the shutoff solenoid, if so equipped, or cover and install the 6V6151 Adapter (10).


POSITION FUEL INJECTION PUMP RACK
10. 6V6151 Adapter. 11. 6V7942 Hook.

4. Move the governor control lever to the "LOW IDLE" position (rotate governor shaft counterclockwise).

5. Install the 6V4186 Timing Pin (3) in the top of the fuel injection pump housing. Push the timing pin in until contact with th fuel rack is made.

6. Use 6V7942 Hook (11) through 6V6151 Adapter (10) to push the sleeve and rack to the "SHUTOFF" position. Make sure timing pin (3) engages in slot (9).


PUSH RACK TO SHUTOFF
11. 6V7942 Hook. 12. Servo valve.

7. Move the governor control lever to the "FULL LOAD" position (rotate governor shaft clockwise) and fasten it in this position.


PULL RACK AGAINST TIMING PIN
11. 6V7942 Hook. 12. Servo valve.

8. Use the 6V7942 Hook (11) to pull the sleeve and rack [through servo (12)] against the timing pin.


FUEL RACK AGAINST TIMING PIN

9. Adjust the 6V6106 Dial Indicator (8) in the collet to zero and tighten the collet. Make sure all three needles of the dial indicator are on zero.

10. Remove the 6V4186 Timing Pin (3), 6V7942 Hook and release the governor lever.


6V7941 COMPRESSOR ASSEMBLY
13. Rod.

11. Turn rod (13) in the 6V7941 Compressor Assembly until the knob is approximately 25.4 mm (1.00 in.) away from the compressor body.

NOTE: The 6V7941 Compressor Assembly is used to remove clearance in the governor linkage to get accurate fuel setting measurements.


INSTALL THE 6V7941 COMPRESSOR ASSEMBLY
10. 6V6151 Adapter. 14. 6V7941 Compressor Assembly.

12. Install 6V7941 Compressor Assembly (14) in 6V6151 Adapter (10) as shown.


REMOVE FUEL RATIO CONTROL
15. Air supply line. 16. Fuel ratio control.

13. Remove air supply line (15) and fuel ratio control (16).


REMOVE ORIFICE SCREEN ASSEMBLY
A. Location for screen assembly.

14. Remove the orifice screen assembly from the governor housing at location (A). This screen must be removed so 6V2017 Governor Adjusting Tool (17) can fit square against the governor housing.

NOTE: If it is thought that it will be necessary to change linkage adjustment, install the outer part of 6V2106 Rack Adjusting Tool (18) along the left side of the governor, before bolts for tool (17) are tightened.

15. Move the governor control lever to the "LOW IDLE" position, and install 6V2017 Governor Adjusting Tool (17) as shown.

16. Move the governor control lever to "FULL LOAD" position and hold there.


FUEL RATIO GOVERNOR ADJUSTMENT CHECK
17. 6V2017 Governor Adjusting Tool. 18. 6V2106 Rack Adjusting Tool (outer part).


CHECKING FUEL RATIO CONTROL SETTING
14. 6V7941 Compressor Assembly.

17. Turn the knob so the rod moves in 6V7941 Compressor Assembly (14) until the needles of the dial indicator move approximately 1 mm (one revolution of the large needle).

18. Slowly turn the knob to move the rod out of 6V7941 Compressor Assembly (14) until the needles of the dial indicator stop movement. This is the STATIC FUEL RATIO CONTROL LEVER SETTING.

NOTE: When the rod is turned OUT, there may be a small initial movement of the dial indicator needles, then they will stop moving while the rod is turned OUT for approximately 1 1/2 turns more. Now the indicator needles will begin to move again, and will follow the turning of the knob until the setting is reached. It is important that the rod be turned slowly, so the fuel rack can follow the movement of the governor components.

19. See the FUEL SETTING AND RELATED INFORMATION FICHE for the correct STATIC FUEL RATIO CONTROL (lever) setting dimension, and compare it to the dial indicator reading. The dial indicator reading must be within ± .25 mm of the dimension given in the FUEL SETTING AND RELATED INFORMATION FICHE or an adjustment is needed.


TOOLS FOR LINKAGE ADJUSTMENT
18. 6V2106 Rack Adjusting Tool (outer part). 19. 6V2104 Hex Wrench.

20. If an adjustment is necessary, use outer part (18) of 6V2106 Rack Adjusting Tool to loosen the locknut and then use the 6V2104 Hex Wrench (19) (part of the 6V2106 Rack Adjusting Tool) to turn the adjustment screw. Turn the screw OUT [counterclockwise (CCW)] to make the setting more positive, or IN [clockwise (CW)] to make the setting more negative. Be sure to tighten the locknut after adjustment is complete. There is a zero tolerance for the linkage setting if an adjustment is made.

NOTE: The needles of the dial indicator will not follow the turning of the adjustment screw. It will be necessary to do Steps 15 through 17 until the adjustment is correct.


ADJUSTMENT OF FUEL RATIO CONTROL LINKAGE


LOCATION OF LINKAGE ADJUSTMENT
20. Adjustment screw. 21. Locknut.

Engine Speed Measurement

6V3121 Multitach Group or6V4950 Injection Line Speed Pickup Group.

The 6V3121 Multitach Group can measure engine speed from a tachometer drive on the engine. It also has the ability to measure engine speed from visual engine parts in rotation.

Special Instruction Form No. SEHS7807 is with the 6V3121 Multitach Group and gives instructions for the test procedure.


6V3121 MULTITACH GROUP
1. Carrying case. 2. Power cable. 3. Tachometer generator. 4. Tachometer drive group. 5. Multitach.

The 6V4950 Injection Line Speed Pickup Group is another diagnostic tool accessory that can be used with the 6V2100 Multitach. It can be used on all Caterpillar Diesel Engines equipped with 6 mm (.25 in.) single wall fuel injection lines. With this pickup group, engine speed can be measured quickly, automatically and with an accuracy of ± 1 rpm.


6V4950 INJECTION LINE SPEED PICKUP GROUP
6. 6V6114 Pickup. 7. 6V6113 Amplifier.

Special Instruction Form No. SEHS8029 is with the group and gives instructions for use of the 6V4950 Injection Line Speed Pickup Group.

Governor Adjustments


NOTICE

A mechanic with training in governor adjustments is the only one to make the adjustment to the set point rpm.


Engine rpm must be checked with an accurate tachometer. Make reference to ENGINE SPEED MEASUREMENT.

Low Idle Adjustment

NOTE: The correct LOW IDLE rpm is given in the FUEL SETTING AND RELATED INFORMATION FICHE.

------ WARNING! ------

To help prevent an accident caused by parts in rotation, work carefully around an engine that has been started.

--------WARNING!------

Start the engine and run until the temperature of normal operation is reached. Check low idle rpm with no load on the engine. If an adjustment is necessary, use the procedure that follows:


LOW IDLE ADJUSTMENT
1. Low idle stop screw.

1. To adjust the LOW IDLE rpm, start the engine and run with the governor control lever in the low idle position. Loosen the locknut for low idle screw (1). Turn the low idle screw to get the correct low idle rpm. Increase engine speed and return to low idle and check low idle speed again. Tighten the locknut.

Checking Set Point (Balance Point)

The engine set point is an adjusted specification and is important to the correct operation of the engine. High idle rpm is NOT an adjusted specification. Set point (formerly balance point) is full load rpm plus an additional 20 rpm. Set point is the rpm at which the fuel setting adjustment screw and stop or first torque spring just start to make contact. At this rpm, the fuel setting adjustment screw and stop or first torque spring still have movement between them. When additional load is put on the engine, the fuel setting adjustment screw and stop or first torque spring will become stable against each other. Set point is controlled by the fuel setting and the high idle adjustment screw.

There is a new and more accurate method for checking the "set point," formerly called the balance point, of the engine. If the tools for the new method are not available, there is an alternate method for checking the "set point."

6V4060 Engine Set Point Indicator Group.

The 6V4060 Engine Set Point Indicator Group with the 6V2100 Multitach can be used to check the set point. Special Instruction Form No. SEHS7931 gives instructions for installation and use of this tool group.


6V4060 ENGINE SET POINT INDICATOR GROUP

8T500 Circuit Tester.6V3121 Multitach Group.

NOTE: Do not use the vehicle tachometer unless its accuracy is known to be within ± 1 rpm.

If the set point is correct and the high idle speed is within specifications, the fuel system operation of the engine is correct. The set point for the engine is:

A. At 20 rpm greater than full load speed.
B. The rpm where the fuel setting adjustment screw stop or first torque spring just make contact.

Use the procedure that follows to check the set point. Make reference to TECHNIQUES FOR LOADING ENGINES in Special Instruction Form No. SEHS7050.

1. Connect a tachometer which has good accuracy to the tachometer drive.


TERMINAL LOCATION
2. Brass terminal screw.

2. Connect the clip end of the 8T500 Circuit Tester to the brass terminal screw (2) on the governor housing. Connect the other end of the tester to a place on the fuel system which is a good ground connection.

------ WARNING! ------

Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.

--------WARNING!------

3. Start the engine.

4. With the engine at normal conditions for operation, run the engine at high idle.

5. Make a record of the speed of the engine at high idle.

6. Add load on the engine slowly until the circuit tester light just comes on (minimum light output). This is the set point.

7. Make a record of the speed (rpm) at the set point.

8. Repeat Step 6 several times to make sure that the reading is correct.

9. Stop the engine. Make a comparison of the records from Steps 5 and 7 with Full Load Speed from the ENGINE INFORMATION PLATE. If the ENGINE INFORMATION PLATE is not available, see the FUEL SETTING AND RELATED INFORMATION FICHE. The tolerance for the set point is ± 10 rpm. The tolerance for the high idle rpm is ± 50 rpm in chassis and ± 30 rpm on a bare engine. If the readings from Steps 5 and 7 are within the tolerance, no adjustment is needed.

NOTE: Later model engines have the actual Dyno High Idle stamped on the ENGINE INFORMATION PLATE. It is possible, in some applications that the high idle rpm will be less than the actual lower limit. This can be caused by high parasitic loads such as hydraulic pumps, compressors, etc.

Adjusting Set Point (Balance Point)

1. If the set point and the high idle rpm are within tolerance, no adjustment is to be made.

2. If the set point rpm is not correct, remove cover (3).


REMOVE COVER
3. Cover.


SET POINT ADJUSTMENT
4. Locknut. 5. Adjustment screw.

3. Loosen locknut (4) and turn adjustment screw (5) to adjust the set point to the midpoint of the tolerance.

4. When the set point is correct, check the high idle rpm. The high idle rpm must not be more than the high limit of the tolerance.

If the high idle rpm is more than the high limit of the tolerance, check the governor spring and flyweights. If the high idle rpm is less than the low limit of the tolerance, check for excess parasitic loads and then the governor spring and flyweights.

Dashpot Adjustment


ADJUSTMENT OF DASHPOT
1. Needle valve.

This adjustment controls the amount of restriction to oil flow into and out of the dashpot chamber. Too much oil flow will cause the governor to hunt, and too little oil flow will cause a slow governor action.

1. Turn needle valve (1) in (clockwise) until it stops. Now, open needle valve (1) two full turns (counterclockwise). The exact point of adjustment is where the governor gives the best performance.

NOTE: Do not keep needle valve (1) fully closed. This can cause excessive overshoot on start up or load rejection.

2. Check governor operation.

With the engine running at medium (mid) speed, load the engine (at least one-quarter load) to find the stability of the setting. Quickly remove the load. A slight overshoot of speed is desired, as it reduces response time. The engine speed should return to smooth steady operation. If it does not have a slight overshoot and return to a smooth steady operation, adjust the needle valve and repeat the above procedure.

Air Inlet And Exhaust System

Restriction Of Air Inlet And Exhaust

There will be a reduction of horsepower and efficiency of the engine if there is a restriction in the air inlet or exhaust system.

Air flow through the air cleaner must not have a restriction (negative pressure difference measurement between atmospheric air and air that has gone through air cleaner) of more than 635 mm (25 in.) of water.

Back pressure from the exhaust (pressure difference measurements between exhaust at outlet elbow and atmospheric air) must not be more than 1016 mm (40 in.) of water.

Measurement Of Pressure In Inlet Manifold

The efficiency of an engine can be checked by making a comparison of the pressure in the inlet manifold with the information given in the FUEL SETTING AND RELATED INFORMATION FICHE. This test is used when there is a decrease of horsepower from the engine, yet there is no real sign of a problem with the engine.

The correct pressure for the inlet manifold is given in the FUEL SETTING AND RELATED INFORMATION FICHE. Development of this information is done with these conditions:

a. 737 mm (29 in.) of mercury (DRY) barometric pressure.
b. 29°C (85°F) outside air temperature.
c. 35 API rated fuel.

On a turbocharged and aftercooled engine, a change in fuel rating will also change horsepower and the pressure in the inlet manifold. If the fuel is rated above 35 API, pressure in the inlet manifold can be less than given in the FUEL SETTING AND RELATED INFORMATION FICHE. If the fuel is rated below 35 API, the pressure in the inlet manifold can be more than given in the FUEL SETTING AND RELATED INFORMATION FICHE. BE SURE THAT THE AIR INLET AND EXHAUST DO NOT HAVE A RESTRICTION WHEN MAKING A CHECK OF PRESSURE IN THE INLET MANIFOLD.


PRESSURE TEST LOCATION
A. Plugs (1/4" Std. pipe tap) for aftercooler air chamber pressure.

Use the 6V9450 Engine Pressure Group to check the pressure in the inlet manifold.


6V9450 ENGINE PRESSURE GROUP

This tool group has a gauge to read pressure in the inlet manifold. Special Instruction Form No. SEHS8524 is with the tool group and gives instructions for its use.


6V3121 MULTITACH GROUP
1. Carrying case. 2. Power cable. 3. Tachometer generator. 4. Tachometer drive group. 5. Multitach.

The 6V3121 Multitach Group can measure engine speed from a tachometer drive on the engine. It also has the ability to measure engine speed from visual engine parts in rotation.

Special Instruction Form No. SEHS7807 is with the 6V3121 Multitach Group and gives instructions fr the test procedure.

Turbocharger

Every 7200 hours or if any unusual sound or vibration in the turbocharger is noticed, a quick check of bearing condition can be made without disassembling the turbocharger. This can be done by removing the piping from the turbocharger and inspecting the compressor impeller, turbine wheel and compressor cover. Rotate the compressor and turbine wheel assembly by hand and observe by feeling excess end play and radial clearance. The rotating assembly should rotate freely with no rubbing or binding. If there is any indication of the impeller rubbing the compressor cover or the turbine wheel rubbing the turbine housing, recondition the turbocharger or replace with a new or rebuilt one.

End clearance is best checked with a dial indicator. Attach a dial indicator with the indicator point on the end of the shaft. Move the shaft from end to end making note of the total indicator reading.

End play for the turbocharger should be 0.08 to 0.25 mm (.003 to .010 in.) Maximum permissible end play for the S4A Turbocharger is 0.20 mm (.008 in.). If end play is more than the maximum end play, rebuild or replace the turbocharger. End play less than the minimum end play could indicate carbon build up on the turbine wheel and the turbocharger should be disassembled for cleaning and inspection.


CHECKING TURBOCHARGER ROTATING ASSEMBLY END PLAY (Typical Example)

A more reliable check of bearing conditions can be made only when the turbocharger is disassembled and the bearings, shaft journal and housing bore diameters can actually be measured.

Exhaust Temperature


6V5000 INFRARED THERMOMETER GROUP

Use the 6V5000 Infrared Thermometer Group to check exhaust temperature. Special Instruction Form No. SEHS8149 is with the tool group and gives instructions for the test procedure.

Crankcase (Crankshaft Compartment) Pressure

Pistons or rings that have damage can be the cause of too much pressure in the crankcase. This condition will cause the engine to run rough. There will also be more than the normal amount of fumes coming from the crankcase breather. This crankcase pressure can also cause the element for the crankcase breather to have a restriction in a very short time. It can also be the cause of oil leakage at gaskets and seals that would not normally have leakage.

Compression

An engine that runs rough can have a leak at the valves, or have valves that need adjustment. Removal of the head and inspection of the valves and valve seats is necessary to find those small defects that do not normally cause a problem. Repair of these problems is normally done when reconditioning the engine.

Cylinder Head

The cylinder head has valve seat inserts, valve guides and bridge dowels that can be removed when they are worn or have damage. Replacement of these components can be made with the tools that follow.

Valves

Valve removal and installation is easier with use of the 5S1330 Valve Spring Compressor Assembly and 5S1322 Valve Keeper Inserter.

Valve Seat Inserts

Tools needed to remove and install valve seat inserts are in the 6V4805 Valve Insert Puller Group. Special Instruction Form No. SMHS7935 gives an explanation for the procedure to remove the valve seat inserts. For easier installation, lower the temperature of the insert before it is installed in the head.

Valve Guides

Tools needed to remove and install valve guides are the 5P2396 Driver Bushing and 7S8859 Driver. The counterbore in the drive bushing installs the guide to the correct height. Use a 1P7451 Valve Guide Honing Group to make a finished bore in the valve guide after installation of the guide in the head. Special Instruction Form No. SMHS7526 gives an explanation for this procedure. Grind the valves after the new valve guides are installed.

Checking Valve Guide Bores

Use the 5P3536 Valve Guide Gauge Group to check the bore of the valve guides. Special Instruction Form No. GMG02562 gives complete and detailed instructions for use of the 5P3536 Valve Guide Gauge Group.


5P3536 VALVE GUIDE GAUGE GROUP

Bridge Dowel

Use a 5P944 Dowel Puller Group with a 5P942 Extractor to remove the bridge dowels. Install a new bridge dowel with a 5P2406 Dowel Driver. This dowel driver installs the bridge dowel to the correct height.

Bridge Adjustment

When the head is disassembled, keep the bridges with their respective cylinders. Adjustment of the bridge will be necessary after the valves are ground or other reconditioning of the cylinder head is done. The bridge should be checked and/or adjusted each time the valves are adjusted. Use the procedure that follows to make an adjustment to the bridge.

NOTE: Valves must be fully closed.


BRIDGE ADJUSTMENT

1. Put engine oil on the bridge dowel in the cylinder head and in the bore in the bridge.

2. Install the bridge with the adjustment screw toward the exhaust manifold.

3. Loosen the locknut for the adjustment screw and loosen the adjustment screw several turns.

4. Put a force on the bridge with a finger to keep the bridge in contact with the valve stem opposite the adjustment screw.

5. Turn the adjustment screw clockwise until it just makes contact with the valve stem. Then turn the adjustment screw 30° more in a clockwise direction to make the bridge straight on the dowel, and to make compensation for the clearance in the threads of the adjustment screw.

6. Hold the adjustment screw in this position and tighten the locknut to 30 ± 4 N·m (22 ± 3 lb.ft.).

7. Put engine oil at the point where the rocker arm makes contact with the bridge.

Valve Clearance Setting

NOTE: Valve clearance is measured between the rocker arm and the bridge for the valves.

NOTE: Intake and exhaust valve lash adjustments should be made at the first recommended oil change.


VALVE CLEARANCE

To make an adjustment to the valve clearance, turn the adjustment screw in the rocker arm. Valve clearance adjustments can be made by using the procedure that follows:

1. Put No. 1 piston at top center (TC) on the compression stroke. Make reference to FINDING TOP CENTER COMPRESSION POSITION FOR NO. 1 PISTON.

2. Make an adjustment to the valve clearance on the intake valves for cylinders 1, 2, and 4. Make an adjustment to the valve clearance on the exhaust valves for cylinders 1, 3, and 5.


VALVE ADJUSTMENT

3. After each adjustment, tighten the nut for valve adjustment screw to 30 ± 4 N·m (22 ± 3 lb.ft.), and check the adjustment again.

4. Remove the timing bolt and turn the flywheel 360° in the direction of engine rotation. This will put No. 6 piston at top center (TC) on the compression stroke. Install the timing bolt in the flywheel.

5. Make an adjustment to the valve clearance on the intake valves for cylinders 3, 5, and 6. Make an adjustment to the valve clearance on the exhaust valves for cylinders 2, 4, and 6.

6. Remove the timing bolt from the flywheel when all adjustments to the valve clearances have been made.


CYLINDER AND VALVE LOCATION

Lubrication System

One of the problems in the list that follows will generally be an indication of a problem in the lubrication system for the engine.

Too Much Oil Consumption

OIL PRESSURE IS LOWOIL PRESSURE IS HIGHTOO MUCH BEARING WEARINCREASED OIL TEMPERATURETOO MUCH OIL CONSUMPTION

Oil Leakage on Outside of Engine

Check for leakage at the seals at each end of the crankshaft. Look for leakage at the oil pan gasket and all lubrication system connections. Check to see if oil comes out of the crankcase breather. This can be caused by combustion gas leakage around the pistons. A dirty crankcase breather will cause high pressure in the crankcase, and this will cause gasket and seal leakage.

Oil Leakage Into Combustion Area of Cylinders

Oil leakage into the combustion area of the cylinders can be the cause of blue smoke. There are four possible ways for oil leakage into the combustion area of the cylinders.

1. Oil leakage between worn valve guides and valve stems.
2. Worn or damaged piston rings, or dirty oil return holes.
3. Compression ring and/or intermediate ring not installed correctly.
4. Oil leakage past the seal rings in the impeller end of the turbocharger shaft.

Too much oil consumption can also be the result if oil with the wrong viscosity is used. Oil with a thin viscosity can be caused by fuel leakage into the crankcase, or by increased engine temperature.

Measuring Engine Oil Pressure

6V9450 Engine Pressure Group.

An oil pressure gauge that has a defect can give an indication of low oil pressure.

The 6V9450 Engine Pressure Group can be used to check engine oil pressure.


6V9450 ENGINE PRESSURE GROUP

This tool group has a gauge to read oil pressure in the engine. Special Instruction Form No. SEHS8524 is with the tool group and gives instructions for the test procedure.

1. Be sure that the engine is filled to the correct level with SAE 10W-30 oil. If any other viscosity of oil is used, the information in the Engine Oil Pressure Graph does not apply.

2. Connect the 6V9450 Engine Pressure Group to the main oil manifold at location (1) or location (2).

3. Operate the engine to get it up to normal operating temperature.


OIL MANIFOLD (Right Side of Engine)
1. Pressure test location.


OIL PRESSURE GAUGE CONNECTION (Left Side of Engine)
2. Pressure test location.

4. Keep the oil temperature constant with the engine at its rated rpm, and read the pressure gauge.

NOTE: Make sure engine oil temperature does not go above 115°C (239°F).

5. On the Engine Oil Pressure Graph, find the point that the lines for engine rpm and oil pressure intersect (connect).


ENGINE OIL PRESSURE GRAPH

6. If the results do not fall within the "ACCEPTABLE" pressure range given in the graph, find the cause and correct it. Engine failure or a reduction in engine life can be the result if engine operation is continued with oil manifold pressure outside this range.

NOTE: A record of engine oil pressure, kept at regular intervals, can be used as an indication of possible engine problems or damage. If there is a sudden increase or decrease of 70 kPa (10 psi) in oil pressure, even through the pressure is in the "ACCEPTABLE" range on the graph, the engine should be inspected and the problem corrected.

Oil Pressure Is Low

Crankcase Oil Level

Check the level of the oil in the crankcase. Add oil if needed. It is possible for the oil level to be too far below the oil pump supply tube. This will cause the oil pump to not have the ability to supply enough lubrication to the engine components.

Oil Pump Does Not Work Correctly

The inlet screen of the supply tube for the oil pump can have a restriction. This will cause cavitation (low pressure bubbles suddenly made in liquids by mechanical forces) and a loss of oil pressure. Air leakage in the supply side of the oil pump will also cause cavitation and loss of oil pressure. If the bypass valve for the oil pump is held in the open (unseated) position, the lubrication system cannot get to a maximum pressure. Oil pump gears that have too much wear will cause a reduction in oil pressure.

Oil Filter Bypass Valves

If the bypass valve for the oil filter is held in the open position (unseated) because the oil filter has a restriction, a reduction in oil pressure can result. To correct this problem, remove and clean the bypass valve and bypass valve bore. Install a new Caterpillar oil filter to be sure that no more debris makes the bypass valve stay open.

Too Much Clearance at Engine Bearings or Open Lubrication System (Broken or Disconnected Oil Line or Passage)

Components that are worn and have too much bearing clearance can cause oil pressure to be low. Low oil pressure can also be cause by an oil line or oil passage that is open, broken or disconnected.

Piston Cooling Tubes (Jets)

When engine is operated, cooling jets direct oil toward the bottom of the piston to lower piston and ring temperatures. If there is a failure of one of the jets, or it is bent in the wrong direction, seizure of the piston will be caused in a very short time.

Use the 5P8709 Piston Tool Group to check and adjust the alignment of piston cooling jets.

Oil Pressure Is High

Oil pressure will be high if the bypass valve for the oil pump cannot move from the closed position.

Too Much Bearing Wear

When some components of the engine show bearing wear in a short time, the cause can be a restriction in an oil passage. A broken oil passage can also be the cause.

If the gauge for oil pressure shows enough oil pressure, but a component is worn because it can not get enough lubrication, look at the passage for oil supply to the component. A restriction in a supply passage will not let enough lubrication get to a component, and this will cause early wear.

Increased Oil Temperature

Look for a restriction in the oil passages of the oil cooler. If the oil cooler has a restriction, the oil temperature will be higher than normal when the engine is operated. The oil pressure of the engine will not get low just because the oil cooler has a restriction.

Also check the oil cooler bypass valve to see if it is held in the open position (unseated). This condition will let the oil through the valve instead of the oil cooler, and oil temperature will increase.

Cooling System

This engine has a pressure type cooling system. A pressure type cooling system gives two advantages. The first advantage is that the cooling system can have safe operation at a temperature that is higher than the normal boiling (steam) point of water. The second advantage is that this type system prevents cavitation (low pressure bubbles suddenly made in liquids by mechanical forces) in the water pump. With this type system, it is more difficult for an air or steam pocket to be made in the cooling system.

The cause for increased engine temperature is generally because regular inspections of the cooling system were not made. Make a visual inspection of the cooling system before a test is made with test equipment.

Visual Inspection Of The Cooling System

1. Check coolant level in the cooling system.

2. Look for leaks in the system.

NOTE: Water pump seals. A small amount of coolant leakage across the surface of the "face-type" seals is normal, and required, to provide lubrication for this type of seal. A hole is provided in the water pump housing to allow this coolant/seal lubricant to drain from the pump housing. Intermittent leakage of small amounts of coolant from this hole is not an indication of water pump seal failure. Replace the water pump seals only if a large amount of leakage, or a constant flow of coolant is observed draining from the water pump housing.

3. Look for bent radiator fins. Be sure that air flow through the radiator does not have a restriction.

4. Inspect the drive belts for the fan.

5. Check for damage to the fan blades.

6. Look for air or combustion gas in the cooling system.

7. Inspect the filler cap and the surface that seals the cap. This surface must be clean.

Testing The Cooling System

Remember that temperature and pressure work together. When a diagnosis is made of a cooling system problem, temperature and pressure must both be checked. Cooling system pressure will have an effect on cooling system temperatures. For an example, look at the chart to see the effect of pressure and height above sea level on the boiling (steam) point of water.

Test Tools for Cooling System

8T470 Thermistor Thermometer Group.8T2700 Blowby/Air Flow Indicator Group.6V3121 Multitach Group.9S8140 Cooling System Pressurizing Pump Group.

The 8T470 Thermistor Thermometer Group is used in the diagnosis of overheating (engine hotter than normal) or overcooling (engine cooler than normal) problems. This group can be used to check temperatures in several different parts of the cooling system. The testing procedure is in Special Instruction Form No. SEHS8446.


8T470 THERMISTOR THERMOMETER GROUP

The 8T2700 Blowby/Air Flow Indicator Group is used to check the air flow through the radiator core. The test procedure is in Special Instruction Form No. SMHS7063.


8T2700 BLOWBY/AIR FLOW INDICATOR GROUP

The 6V3121 Multitach Group is used to check the fan speed. The testing procedure is in Special Instruction Form No. SEHS7807.


6V3121 MULTITACH GROUP

Checking Pressure Cap

9S8140 Cooling System Pressurizing Pump Group.

One cause for a pressure loss in the cooling system can be a bad seal on the radiator pressure cap.

------ WARNING! ------

DO NOT loosen the filler or pressure cap on a hot engine. Steam or hot coolant can cause severe burns.

--------WARNING!------

After the engine is cool, loosen the pressure cap and let the pressure out of the cooling system. Then remove the pressure cap.


TYPICAL SCHEMATIC OF PRESSUE CAP
A. Sealing surface of cap and radiator.

Inspect the pressure cap carefully. Look for damage to the seal or to the surface that seals. Any foreign material or deposits on the cap, seal or surface that seals, must be removed.

The 9S8140 Cooling System Pressurizing Pump Group is used to test pressure caps and to pressure check the cooling system for leaks.

------ WARNING! ------

NO NOT loosen the filler or pressure cap on a hot engine. Steam or hot coolant can cause severe burns.

--------WARNING!------

To check the pressure cap for the pressure that makes the pressure cap open, use the procedure that follows:

1. Remove the pressure cap from the radiator.

2. Put the pressure cap on the 9S8140 Cooling System Pressurizing Pump Group.

3. Look at the gauge for the exact pressure that makes the pressure cap open.

4. Make a comparison of the reading on the gauge with the correct pressure at which the pressure cap must open.

NOTE: The correct pressure that makes the pressure cap open is on the pressure cap and is also in the SPECIFICATIONS section.

5. If the pressure cap is bad, install a new pressure cap.

Testing Radiator and Cooling System for Leaks

9S8140 Cooling System Pressurizing Pump Group.

To test the radiator and cooling system for leaks, use the procedure that follows:

------ WARNING! ------

DO NOT loosen the filler or pressure cap on a hot engine. Steam or hot coolant can cause severe burns.

--------WARNING!------

1. Remove the pressure cap from the radiator.

2. Make sure the coolant is over the top of the radiator core.

3. Put the 9S8140 Cooling System Pressurizing Pump Group on the radiator.

4. Get the pressure reading on the gauge to 20 kPa (3 psi) more than the pressure on the pressure cap.

5. Check the radiator for outside leakage.

6. Check all connections and hoses for the cooling system for outside leakage.

7. If you do not see any outside leakage and the pressure reading on the gauge is still the same after 5 minutes, the radiator and cooling system does not have leakage. If the reading on the gauge goes down and you do not see any outside leakage, there is leakage on the inside of the cooling system. Make repairs as necessary.

------ WARNING! ------

If a pressure indication is shown on the gauge, to avoid personal injury push release valve (A) to release all pressure in the system before removal of hose (C) from radiator.

--------WARNING!------


9S8140 COOLING SYSTEM PRESSURIZING PUMP GROUP
A. Release valve. B. Adapter. C. Hose.

Gauge for Water Temperature

8T470 Thermistor Thermometer Group.

or 2F7112 Thermometer and 6B5072 Bushing.


WATER TEMPERATURE CONNECTION
1. Water temperature regulator housing. 2. Plug (four-1/2"-14 NPTF Thd). 3. Plug (one-3/8"-18 NPTF Thd.).

If the engine gets too hot and a loss of coolant is a problem, a pressure loss in the cooling system could be the cause. If the gauge for water temperature shows that the engine is getting too hot, look for coolant leakage. If a place cannot be found where there is coolant leakage, check the accuracy of the gauge for water temperature. A temperature gauge of known accuracy can be connected at the location for plug (1) to make this check. Also, the 8T470 Thermistor Thermometer Group or the 2F7112 Thermometer and 6B5072 Bushing can be used.

------ WARNING! ------

Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.

--------WARNING!------


WATER TEMPERATURE GAUGE

Start the engine and run it until the temperature is at the desired range according to the test gauge or thermometer. If necessary, put a cover over part of the radiator or cause a restriction of the coolant flow. The reading on the gauge for water temperature must be the same as the test gauge or thermometer within the tolerance range in the chart.

Water Temperature Regulators

1. Remove the regulator from the engine.

2. Heat water in a pan until the temperature is 92°C (197°F). Move the water around in the pan to make it all the same temperature.

3. Hang the regulator in the pan of water. The regulator must be below the surface of the water and it must be away from the sides and bottom of the pan.

4. Keep the water at the correct temperature for 10 minutes.

5. After ten minutes, remove the regulator and immediately measure the distance the regulator has opened. The distance must be a minimum of 9.53 mm (.375 in.).

6. If the distance is less than 9.53 mm (.375 in.), make a replacement of the regulator.

Basic Block

Piston Rings

This engine has piston grooves and rings of the KEYSTONE (taper) design. The 8T3150 Keystone Piston Ring Groove Gauge Group is available to check the top two ring grooves in the piston. For correct use of the gauge group see the instruction card that is with the gauge group.


INSTRUCTIONS FOR 8T3150 KEYSTONE PISTON RING GROOVE GAUGE GROUP

Connecting Rods And Pistons

Use the 7M3978 Piston Ring Expander to remove or install piston rings.

Use the 5P3526 Piston Ring Compressor to install pistons into cylinder block.

Tighten the connecting rod nuts in the step sequence that follows:

1. Put 2P2506 Thread Lubricant on bolt threads and contact surfaces of nut and cap.

2. Tighten all nuts to 80 ± 8 N·m (60 ± 6 lb.ft.).

3. Put a mark on each nut and end of bolt.

4. Tighten each nut 120° from the mark.

The connecting rod bearings fit tightly in the bore in the rod. If bearing joints or backs are worn (fretted), check bore size. This can be an indication of wear because of a loose fit.

Connecting Rod And Main Bearings

Connecting rod bearings are available with 0.63 mm (.025 in.) and 1.27 mm (.050 in.) smaller inside diameter than the original size bearings. These bearings are for crankshafts that have been "ground" (made smaller than the original size).

Main bearings are available with a larger outside diameter than the original size bearings. These bearings are for cylinder blocks that have had the bore for the main bearings "bored" (made larger than the original size). The size available is 0.63 mm (.025 in.) larger outside diameter than the original size bearings.

Cylinder Block

The bore in the block for main bearings can be checked with the main bearing caps installed without bearings. Tighten the nuts that hold the caps to the torque shown in the SPECIFICATIONS. Alignment error in the bores must not be more than 0.08 mm (.003 in.). Special Instruction, Form No. SMHS7606 gives instructions for the use of 1P4000 Line Boring Tool Group for alignment of the main bearing bores. The 1P3537 Dial Bore Gauge Group can be used to check the size of the bores. Special Instruction Form No. GMG00981 is with the group.


1P3537 DIAL BORE GAUGE GROUP

Projection Of Cylinder Liner

8B7548 Push-Puller.
Three 3H465 Plates.
1P2396 Puller Plate.Two 3/4 in. 16 NF Bolts, 177.8 mm (7 in.) long.Four 3/4 in. 16 NF bolts, 76.2 mm (3 in.) long.Eight 2F126 Seals (Copper Washers).8T455 Liner Projection Tool Group.8S3140 Cylinder Block Counterboring Tool Arrangement.

Check liner projection above top plate as follows:

1. Make certain that top plate (4) and the cylinder liner flange are clean. Install a new top plate gasket, but do not install liner seals when this check is made.


HOLDING TOP PLATE TO CYLINDER BLOCK (Typical Example)
1. 3H465 Plate. 2. 1P2396 Puller Plate. 3. 2F126 Seals (copper washers). 4. Top plate.

2. Use 3/4-16 NF bolts, 76.2 mm (3 in.) long, with two 2F126 Seals (3) on each bolt to hold the top plate (4) to the cylinder block. Install two bolts with seals (3) on each side of the cylinder liner. Tighten the bolts evenly, in four steps; 14 N·m (10 lb.ft.), 35 N·m (25 lb.ft.), 70 N·m (50 lb.ft.) and then to 95 N·m (70 lb.ft.).

NOTE: To keep installation and removal of bolts and washers to a minimum as each liner is checked, install two bolts with washers on each side of each cylinder liner along the complete length of the top plate.

3. Use a 1P2396 Puller Plate (2), three 3H465 Plates (1), 8B7548 Push-Puller (6), and two 3/4-16 NF bolts, 177.8 mm (7 in.) long to hold the liner down.

4. Tighten the bolts evenly in four steps; 7 N·m (5 lb.ft.), 20 N·m (15 lb.ft.), 35 N·m (25 lb.ft.), and then to 70 N·m (50 lb.ft.). Distance from bottom edge of 8B7548 Push-Puller (6) to top plate must be the same on both sides of cylinder liner.

5. Use a 8T455 Liner Projection Tool Group to measure liner projection. Special Instruction Form No. SMHS7727 gives more information for the measurement procedures.

6. To zero dial indicator (5), use the back of 1P5507 Gauge with dial indicator (5) mounted in 1P2402 Gauge Body (7).

7. Liner projection must be 0.03 to 0.15 mm (.001 to .006 in.). (Make the measurement to the top of the liner flange, not the inner ring). The maximum differential between high and low measurements made at four places around each liner is 0.05 mm (.002 in.). The average projection of liners next to each other must not be more than 0.05 mm (.002 in.). The maximum difference in the average projection of the cylinder liners under one cylinder head must not be more than 0.10 mm (.004 in.)


MEASURING LINER HEIGHT PROJECTION (TYPICAL EXAMPLE)
5. Dial indicator. 6. 8B7548 Push-Puller. 7. 1P2402 Gauge Body.

NOTE: If liner projection changes from point to point around the liner, turn the liner to a new position within the bore. If still not within specifications, move liner to a different bore.

NOTE: When liner projection is correct, put a temporary mark on the liner and top plate so when seals and band are installed, the liner can be installed in the correct position.

The contact face of the cylinder block can be machined with use of the 8S3140 Cylinder Block Counterboring Tool Arrangement to adjust liner projection. Special Instruction Form No. FM055228 is part of the cylinder block counterboring tool arrangement and gives tool arrangement and information to use the tool. 2W3815 and 5N93 Stainless Steel Inserts are available for use after the cylinder block has been counterbored. Special Instruction Form No. SMHS8222 has the correct installation procedure for the inserts.

Flywheel And Flywheel Housing

8T5096 Dial Indicator Group.

Heat the ring gear to install it. Do not heat to more than 315°C (600°F). Install the ring gear so the chamfer on the gear teeth are next to the starter pinion when the flywheel is installed.

Face Run Out (axial eccentricity) of the Flywheel Housing

If any method other than given here is used, always remember bearing clearance must be removed to get correct measurements.


8T5096 DIAL INDICATOR GROUP INSTALLED


CHECKING FACE RUNOUT OF THE FLYWHEEL HOUSING
A. Bottom. B. Right side. C. Top. D. Left side.

1. Fasten a dial indicator to the crankshaft flange so the anvil of the indicator will touch the face of the flywheel housing.

2. Put a force on the crankshaft toward the rear before the indicator is read at each point.

3. With dial indicator set at 0.0 mm (.000 in.) at location (A), turn the crankshaft and read the indicator at locations (B), (C) and (D).

4. The difference between lower and higher measurements taken at all four points must not be more than 0.38 mm (.015 in.), which is the maximum permissible face run out (axial eccentricity) of the flywheel housing.

Bore Runout (radial eccentricity) of the Flywheel Housing


8T5096 DIAL INDICATOR GROUP INSTALLED

1. Fasten the dial indicator as shown so the anvil of the indicator will touch the bore of the flywheel housing.

2. With the dial indicator in position at (C), adjust the dial indicator to "0" (zero). Push the crankshaft up against the top of the bearing. Write the measurement for bearing clearance on line 1 in column (C) in the CHART FOR DIAL INDICATOR MEASUREMENTS.

NOTE: Write the dial indicator measurements with their positive (+) and negative (-) notation (signs). This notation is necessary for making the calculations in the chart correctly.

3. Divide the measurement from Step 2 by 2. Write this number on line 1 in columns (B) & (D).

4. Turn the crankshaft to put the dial indicator at (A). Adjust the dial indicator to "0" (zero).

5. Turn the crankshaft counterclockwise to put the dial indicator at (B). Write the measurements in the chart.


CHECKING BORE RUNOUT OF THE FLYWHEEL HOUSING

6. Turn the crankshaft counterclockwise to put the dial indicator at (C). Write the measurement in the chart.

7. Turn the crankshaft counterclockwise to put the dial indicator at (D). Write the measurement in the chart.

8. Add lines I and II by columns.

9. Subtract the smaller number from the larger number in line III in columns (B) & (D). The result is the horizontal eccentricity (out of round). Line III, column (C) is the vertical eccentricity.

10. On the graph for total eccentricity find the point of intersection of the lines for vertical eccentricity and horizontal eccentricity.

11. If the point of intersection is in the range marked "Acceptable" the bore is in alignment. If the point of intersection is in the ranged marked "Not Acceptable" the flywheel housing must be changed.


GRAPH FOR TOTAL ECCENTRICITY

Face Runout (axial eccentricity) of the Flywheel

1. Install the dial indicator as shown. Always put a force on the crankshaft in the same direction before the indicator is read so the crankshaft end clearance (movement) is always removed.


CHECKING FACE RUNOUT OF THE FLYWHEEL

2. Set the dial indicator to read 0.0 mm (.000 in.).

3. Turn the flywheel and read the indicator every 90°.

4. The difference between the lower and higher measurements taken at all four points must not be more than 0.15 mm (.006 in.), which is the maximum permissible face runout (axial eccentricity) of the flywheel.

Bore Runout (radial eccentricity) of the Flywheel

1. Install the dial indicator (3) and make an adjustment of the universal attachment (4) so it makes contact as shown.


CHECKING BORE RUNOUT OF THE FLYWHEEL
1. 7H1945 Holding Rod. 2. 7H1645 Holding Rod. 3. 7H1942 Indicator. 4. 7H1940 Universal Attachment.

2. Set the dial indicator to read 0.0 mm (.000 in.).

3. Turn the flywheel and read the indicator every 90°.

4. The difference between the lower and higher measurements taken at all four points must not be more than 0.15 mm (.006 in.), which is the maximum permissible bore runout (radial eccentricity) of the flywheel.

5. Runout (eccentricity) of the bore for the pilot bearing for the flywheel clutch, must not exceed 0.13 mm (.005 in.).


CHECKING FLYWHEEL CLUTCH PILOT BEARING BORE

Vibration Damper

Damage to or failure of the damper will increase vibrations and result in damage to the crankshaft. It will cause more gear train noise at variable points in the speed range.

The vibration damper has marks (1) on the hub and the ring. These marks give an indication of the condition of the vibration damper. If the marks are not in alignment, the rubber part (between the ring and the hub) of the vibration damper has had a separation from the ring and/or hub. If the marks are not in alignment, install a new vibration damper.

A used vibration damper can have a visual wobble (movement to the front and then to the rear when in rotation) on the outer ring and still not need replacement, because some wobble of the outer ring is normal. To see if the amount of wobble is acceptable, or replacement is necessary, check the damper with the procedure that follows:


VIBRATION DAMPER
1. Alignment marks.

1. Install a dial indicator, contact point and other parts as necessary to hold the dial indicator stationary. The contact point must be perpendicular (at 90° angle) to the face of the outer ring of the damper, and must make contact approximately at the center of the outer ring.

2. Push on the front end of the crankshaft so the end play (free movement on the centerline) is removed. Keep the crankshaft pushed back until the measurements are done.

3. Adjust the dial indicator to zero.

4. Turn the crankshaft 360° and watch the dial indicator. A total indicator reading of 0.00 to 2.03 mm (.000 to .080 in.) is acceptable.

Electrical System

Test Tools For Electrical System

6V4930 Battery Load Tester.8T900 AC/DC Clamp-On Ammeter.6V7070 Heavy-Duty Digital Multimeter or6V7800 Regular-Duty Digital Multimeter.

Most of the tests of the electrical system can be done on the engine. The wiring insulation must be in good condition, the wire and cable connections must be clean and tight, and the battery must be fully charged. If the on-engine test shows a defect in a component, remove the component for more testing.

The service manual TESTING AND ADJUSTING ELECTRICAL COMPONENTS, Form No. REG00636 has complete specifications and procedures for the components of the starting circuit and the charging circuit.


6V4930 BATTERY LOAD TESTER

The 6V4930 Battery Load Tester is a portable unit in a metal case for use under field conditions and high temperatures. It can be used to load test all 6, 8 and 12V batteries. This tester has two heavy-duty load cables that can easily be fastened to the battery terminals, and a load adjustment knob on the front panel permits a current range up to a maximum of 700 amperes. The tester also has a thermometer to show when the safe operating temperature limit of the unit has been reached.

NOTE: Make reference to Special Instruction Form No. SEHS8268 for more complete information for use of the 6V4930 Batter Load Tester.


8T900 AC/DC CLAMP-ON AMMETER

The 8T900 AC/DC Clamp-On Ammeter is a completely portable, self-contained instrument that allows electrical current measurements to be made without breaking the circuit or disturbing the insulation on conductors. A digital display is located on the ammeter for reading current directly in a range from 1 to 1200 amperes. If an optional 6V6014 Cable is connected between this ammeter and one of the digital multimeters, current readings of less than 1 ampere can then be read directly from the display of the multimeter.

A lever is used to open the jaws over the conductor [up to a diameter of 19 mm (.75 in.)], and the spring loaded jaws are then closed around the conductor for current measurement. A trigger switch that can be locked in the ON or OFF position is used to turn on the ammeter. When the turn-on trigger is released, the last current reading is held on the display for 5 seconds. This allows accurate measurements to be taken in limited access areas where the digital display is not visible to the operator. A zero control is provided for DC operation, and power for the ammeter is supplied by batteries located inside the handle.

NOTE: Make reference to Special Instruction Form No. SEHS8420 for more complete information for use of the 8T900 Clamp-On Ammeter.


6V7070 HEAVY-DUTY DIGITAL MULTIMETER

The 6V7070 Heavy-Duty Digital Multimeter is a completely portable, hand held instrument with a digital display. This multimeter is built with extra protection against damage in field applications, and is equipped with seven functions and 29 ranges. The 6V7070 Multimeter has an instant ohms indicator that permits continuity checks for fast circuit inspection. It also can be used for troubleshooting small value capacitors.

The 6V7800 Regular-Duty Digital Multimeter (a low cost option to the Heavy-Duty Multimeter) is also available; however, the 6V7800 Multimeter does not have the 10A range or the instant ohms feature of the 6V7070 Multimeter.

NOTE: Make reference to Special Instruction Form No. SEHS7734 for more complete information for use of the 6V7070 and 6V7800 Multimeters.

Battery

------ WARNING! ------

Never disconnect any charging unit circuit or battery circuit cable from battery when the charging unit is operated. A spark can cause an explosion from the flammable vapor mixture of hydrogen and oxygen that is released from the electrolyte through the battery outlets. Injury to personnel can be the result.

--------WARNING!------

The battery circuit is an electrical load on the charging unit. The load is variable because of the condition of the charge in the battery. Damage to the charging unit will result if the connections (either positive or negative) between the battery and charging unit are broken while the charging unit is in operation. This is because the battery load is lost and there is an increase in charging voltage. High voltage will damage, not only the charging unit, but also the regulator and other electrical components.

Load test a battery that does not hold a charge when in use. To do this, put a resistance across the main connections (terminals) of the battery. For a 6, 8 or 12V battery, use a test load of three times the ampere/hour rating (the maximum test load on any battery is 500 amperes). Let the test load remove the charge (discharge) of the battery for 15 seconds and with the test load still applied, test the battery voltage. A 6V battery in good condition will show 4.5V; and 8V battery will show 6V; a 12V battery will show 9V. Each cell of a battery in good condition must show 1.6V on either a 6, 8 or 12V battery.

Charging System

The condition of charge in the battery at each regular inspection will show if the charging system operates correctly. An adjustment is necessary when the battery is constantly in a low condition of charge or a large amount of water is needed (more than one ounce of water per cell per week or per every 50 service hours).

When it is possible, make a test of the charging unit and voltage regulator on the engine, and use wiring and components that are a permanent part of the system. Off-engine (bench) testing will give a test of the charging unit and voltage regulator operation. After repairs are made, again make a test to give proof that the units are repaired to their original condition of operation.

Before the start of on-engine testing, the charging system and battery must be checked as shown in the Steps that follow:

1. Battery must be at least 75% (1.240 Sp. Gr.) fully charged and held tightly in place. The battery holder must not put too much stress on the battery.

2. Cables between the battery, starter and engine ground must be the correct size. Wires and cables must be free of corrosion and have cable support clamps to prevent stress on battery connections (terminals).

3. Leads, junctions, switches, and panel instruments that have direct relation to the charging circuit must give correct circuit control.

4. Inspect the drive components for the charging unit to be sure they are free of grease and oil and have the ability to operate the charging unit.

Alternator Regulator Adjustment (Delco-Remy)

When an alternator is charging the battery too much or not enough, an adjustment can be made to the charging rate of the alternator. Make reference to the Specifications section to find all testing specifications for the alternators and regulators.


5N5692 ALTERNATOR
1. Ground terminal. 2. Pulley nut.

No adjustment can be made to change the rate of charge on the alternator regulators. If rate of change is not correct, a replacement of the regulator is necessary.

Prestolite Alternator Regulator (Separate from Alternator)

The regulator components are sealed in an insulation of epoxy. The regulator is an electronic component with no moving parts (solid state) and has an adjustment screw (1) on the back. This voltage adjustment screw is used to meet different needs of operation at different times of the year. To increase or decrease by .5 volts from the normal (N) setting, remove the regulator and change the position of the adjustment screw and pointer. Move adjustment screw (1) and pointer to "H" position (2) to increase the voltage. Move adjustment screw (1) and pointer to "L" position (4) to decrease the voltage.


PRESTOLITE ALTERNATOR REGULATOR
1. Adjustment screw. 2. High output position. 3. Green wire to field terminal of alternator. 4. Low output position. 5. Orange wire to field supply terminal.

Motorola Alternator Regulator (Separate from Alternator)

When the alternator is either charging the battery too much or not enough, an adjustment can be made to the alternator charging rate. To make an adjustment to the voltage output, remove the cap (1) from the alternator regulator and change the regulator adjustment with a screwdriver.


ALTERNATOR REGULATOR (MOTOROLA)
1. Cap. for adjustment screw.

To increase the voltage, turn the adjustment screw clockwise. The adjustment screw under the cap (1) has five positions (number 1 is the last position clockwise).

Motorola Alternator Regulator (6T9445) Bosch Alternator Regulator (9G7567) Nippondenso Alternator Regulator (7T2793)


MOTOROLA REGULATOR (6T9445)


BOSCH REGULATOR (9G7567)


NIPPONDENSO REGULATOR (7T2793)

No adjustment can be made to change the rate of charge on these alternator regulators. If rate of charge is not correct, a replacement of the regulator is necessary.

Alternator Pulley Nut Tightening (Delco-Remy)

Tighten nut that holds the pulley to a torque of 100 ± 10 N·m (75 ± 5 lb.ft.) with the tools shown.


TOOLS TO TIGHTEN ALTERNATOR PULLEY NUT
1. 5P7425 Torque Wrench. 2. 8S1588 Adapter (1/2" female to 3/8" male). 3. FT1697 Socket. 4. 8H8517 Combination Wrench (1 1/8"). 5. FT1696 Wrench.

Starting System

Use the multimeter in the DCV range to find starting system components which do not function.

Move the start control switch to activate the starter solenoid. Starter solenoid operation can be heard as the pinion of the starter motor is engaged with the ring gear on the engine flywheel.

If the solenoid for the starter motor will not operate, it is possible that the current from the battery did not get to the solenoid. Fasten one lead of the multimeter to the connection (terminal) for the battery cable on the solenoid. Put the other lead to a good ground. A zero reading is an indication that there is a broken circuit from the battery. More testing is necessary when there is a voltage reading on the multimeter.

Make a test with one multimeter lead fastened to the connection (terminal) for the small wire at the solenoid and the other lead to the ground. Look at the multimeter and activate the starter solenoid. A voltage reading shows that the problem is in the solenoid. A zero reading is an indication that the problem is in the starter switch or the wires for the start switch.

Fasten one multimeter lead to the start switch at the connection (terminal) for the wire from the battery. Fasten the other lead to a good ground. A zero reading indicates a broken circuit from the battery. Make a check of the circuit breaker and wiring. If there is a voltage reading, the problem is in the start switch or in the wires for the start switch.

A starter motor that operates too slow can have an overload because of too much friction in the engine being started. Slow operation of the starter motor can also be caused by a short circuit, loose connections and/or dirt in the motor.

Pinion Clearance Adjustment (Delco-Remy)

When the solenoid is installed, make an adjustment of the pinion clearance. The adjustment can be made with the starter motor removed.


CONNECTION FOR CHECKING PINION CLEARANCE
1. Connector from MOTOR terminal on solenoid to motor. 2. SW terminal. 3. Ground terminal.

1. Install the solenoid without connector (1) from the MOTOR connections (terminal) on solenoid to the motor.

2. Connect a battery, of the same voltage as the solenoid, to the terminal (2), marked SW.

3. Connect the other side of the battery to ground terminal (3).

4. Connect for a moment, a wire from the solenoid connection (terminal) marked MOTOR to the ground connection (terminal). The pinion will shift to crank position and will stay there until the battery is disconnected.


PINION CLEARANCE ADJUSTMENT
4. Shaft nut. 5. Pinion. 6. Pinion clearance.

5. Push the pinion toward the commutator end to remove free movement.

6. Pinion clearance (6) must be 8.3 to 9.9 mm (.33 to .39 in.).

7. To adjust pinion clearance, remove plug and turn nut (4).

Pinion Clearance Adjustment (Prestolite)

There are two adjustments on this type motor. They are end play for the armature and pinion clearance.

End Play For The Armature

The correct end play for the armature is 0.13 to 0.76 mm (.005 to .030 in.). The adjustment is made by adding or removing thrust washers on the commutator end of the armature shaft.

Pinion Clearance Adjustment

1. To adjust the pinion distance, connect the solenoid to a 12 volt battery as shown. For a short moment, connect a wire from the "motor" stud of the solenoid to the stud at (1) in the commutator end. This moves the solenoid and drive into the cranking position.

Disconnect the wire.

NOTE: The drive is in the cranking position until the battery is disconnected.


CONNECTING FOR ADJUSTMENT OF THE PINION CLEARANCE
1. Stud.

2. Push the drive toward the commutator end of the motor to eliminate any slack movement in the linkage and measure the distance between the outside edge of the drive sleeve and the thrust washer. The distance (3) must be 0.51 to 1.27 mm (.020 to .050 in.).


PINION CLEARANCE ADJUSTMENT
2. Adjusting nut. 3. Distance.

3. Remove the plug. Turn the adjusting nut (2) in or out as necessary to get this distance.

4. Install the plug.

Air Starting System

Pressure Regulating Valve


PRESSURE REGULATING VALVE (Typical Illustration)
1. Adjustment screw. 2. Regulator inlet. 3. Regulator outlet.

To check and adjust the pressure regulating valve, use the procedure that follows:

1. Drain the line to the pressure regulating valve or drain the air storage tank.

2. Disconnect the regulator from the starter control valve.

3. Connect an 8M2885 Pressure Gauge to regulator outlet (3).

4. Put air pressure in the line or tank.

5. Check the pressure.

6. Adjust the pressure regulating valve as shown in Chart For Air Pressure Setting.

7. Remove the air pressure from the line or tank.

8. Remove the 8M2885 Pressure Gauge and connect the air pressure regulator to the line to the air starter motor.

Each engine application will have to be inspected to get the most acceptable starting results. Some of the factors that affect regulating valve pressure setting are: attachment loads pulled by engine during starting, ambient temperature conditions, oil viscosity, capacity of air reservoir, and condition of engine (new or worn).

The advantage of setting the valve at the higher pressures is increased torque for starter motor and faster rotation of engine. The advantage of setting the valve at the lower pressures is longer time of engine rotation for a given capacity of supply air.

Lubrication

Always use an air line lubricator with these air starter motors.

For temperatures above 0°C (32°F), use a good quality SAE 10 motor oil.

For temperatures below 0°C (32°F), use diesel fuel.

To maintain the efficiency of the starter motor, flush it at regular intervals. Pour approximately 0.5 liter (1 pt.) of diesel fuel into the air inlet of the starter motor and operate the motor. This will remove the dirt, water and oil mixture (gummy coating) from the vanes of the motor.

Air Starting Motor

The cylinder (12) must be assembled over the rotor (15) and on the front end plate (16) so the dowel hole (12A) and the inlet passages (12B) for the air are as shown in the rear view illustration of the cylinder and rotor. If the installation is not correct, the starter drive (42) will turn in the wrong direction.


REAR VIEW OF THE CYLINDER AND ROTOR FOR CLOCKWISE ROTATION
12. Cylinder. 12A. Air inlet passages. 12B. Dowel hole. 15. Rotor.

Ingersoll-Rand, Size 150 BMP


COMPONENTS OF THE AIR STARTER (INGERSOLL-RAND, SIZE 150 BMP, MODEL C OR E)
1. Motor housing cover. 2. Plug. 3. Plug. 3A. Plug. 6. Bolt (cap screw). 7. Lockwasher. 8. Gasket. 9. Rotor rear bearing. 10. Bearing retainer. 11. Rear end plate. 12. Cylinder. 13. Dowel. 14. Rotor vane. 15. Rotor. 16. Front end plate. 17. Rotor front bearing. 18. Motor housing. 19. Gear case gasket. 20. Rotor pinion. 21. Rotor pinion retainer. 22. Gear case. 23. Bearing rejecting washer. 24. Rear bearing for the drive shaft. 25. Drive gear. 25A. Thrust washer. 26. Key for the drive gear. 27. Front bearing for the drive shaft. 28. Gear case cover. 29. Grease seal for the drive shaft. 30. Cover seal. 31. Piston seal. 32. Bolt. 33. Lockwasher. 34. Drive shaft. 35. Drive shaft collar. 36. Piston. 36A. Piston ring. 37. Shift ring. 38. Shift ring retainer. 39. Shift ring spacer. 40. Piston return spring. 41. Return spring seat. 42. Starter drive (pinion). 43. Lockwasher. 44. Bushing or the bolts. 45. Drive housing. 46. Drive housing bushing. 47. Oiler felt for the bushing. 48. Oiler plug.

Tighten the bolts (6) of the rear cover in small increases of torque for all bolts until all bolts are tight 25 to 35 N·m (20 to 25 lb.ft.).

Put a thin layer of lubricant on the lip of the seal (29) and on the outside of the collar (35), for installation of drive shaft (34). After installation of the shaft through the cover (28) check the lip of the grease seal (29). It must be turned correctly toward the drive gear (25). If the shaft turned the seal lip in the wrong direction, remove the shaft and install again. Use a tool with a thin point to turn the seal lip in the correct direction.

Tighten the bolts (32) of the drive housing in small increases of torque for all bolts until all bolts are tight 11.3 N·m (100 lb.in.).

Check the motor for correct operation. Connect an air hose to the motor inlet (49) and make the motor turn slowly. Look at the drive pinion (42) from the front of the drive housing (45). The pinion must turn clockwise.


AIR STARTER (INGERSOLL-RAND)
6. Bolt. 12. Cylinder. 15. Rotor. 16. Front end plate. 22. Gear case. 25. Drive gear. 28. Gear case cover. 29. Grease seal. 32. Bolt. 34. Drive shaft. 35. Drive shaft collar. 42. Starter drive (pinion). 45. Drive housing. 49. Air inlet. 50. Deflector (air outlet). 51. Mounting flange on the drive housing.

Connect an air hose to the small hole with threads in the drive housing (45), nearer the gear case (22). When a little air pressure goes to the drive housing, the drive pinion (42) must move forward to the engaged position. Also, the air must get out through the other hole with threads nearer the mounting flange (51).

Ingersoll-Rand, Size SS 350


COMPONENTS OF THE AIR STARTER (INGERSOLL-RAND, SIZE SS350)
1. Motor housing cover. 2. Plug. 3. Nameplate. 4. Screw. 5. Bolt (cap screw). 6. Plug. 7. Rear end plate. 8. O-ring seal. 9. Cylinder housing kit. 10. Dowel. 11. Front end plate. 12. O-ring seal. 13. Rotor. 14. Rear rotor bearing. 15. O-ring seal. 16. Retaining nut. 17. Retaining nut cover. 18. Front rotor bearing. 19. Wave washers. 20. Rotor vanes. 21. Rotor pinion. 22. Bolts. 23. Gear case. 24. O-ring seal. 25. Drive gear. 26. Drive gear bearing. 27. Retaining ring. 28. Gear case seal. 29. Retaining ring. 31. Piston kit. 32. O-ring seal. 33. Piston bearing. 34. Retaining ring. 35. Clutch jaw kit. 36. Retaining ring. 37. Clutch springs. 38. Clutch spring cup. 39. Piston return springs. 40. Return spring seat. 41. Drive shaft. 42. Drive shaft spacer. 43. Drive shaft washer. 44. Bolt. 45. Drive shaft collar. 46. Drive pinion. 47. Bolt. 48. Drive housing kit. 49. Drive housing seal. 50. Drive housing bearing. 51. O-ring seal. 52. Drive housing washer. 53. Drive housing gasket. 54. Bolts

During assembly put two pieces of 0.10 mm (.004 in.) shim stock between rotor body and end plate (7). Tighten retaining nut (16) until there is a slight drag on the shim stock. Tighten the clamping screw in the retaining nut (16). The clearance between the rotor assembly and the endplate can be 0.05 to 0.13 mm (.002 to .005 in.).

Install four cover bolts (5), and tighten to a torque of 27 N·m (20 lb.ft.).

Tighten retaining bolt (22) to a torque of 68 N·m (50 lb.ft.).

Install gear case seal (28) lip side first, into the small bore of the gear case. Put a thin layer of lubricant on the lip type seal and all O-ring seals.

Install drive shaft bolt (44) and tighten to a torque of 75 N·m (55 lb.ft.).

Install four drive housing bolts (54). Tighten to a torque of 27 N·m (20 lb.ft.).

Tighten the drive pinion bolt (47) to a torque of 75 N·m (55 lb.ft.).


AIR STARTER (INGERSOLL-RAND)
5. Cover bolts. 7. End plate. 16. Retaining nut. 22. Retaining bolt. 28. Seal. 44. Drive shaft bolt. 47. Drive pinion bolt. 54. Drive housing bolts.

After assembly, turn the drive pinion by hand in the direction of starter rotation. The clutch should ratchet smoothly with a slight "clicking" action. Attach a hose to the "IN" port and apply 345 kPa (50 psi) air pressure. The drive pinion should move outward and air will escape from the "OUT" port. Plug the "OUT" port and apply 1034 kPa (150 psi) air pressure.

The distance measured from the face of the drive pinion to the face of the mounting flange should be 70.5 mm (2.77 in.). Remove pressure from the "IN" port. The measured distance should be 46.3 mm (1.82 in.).

Connect a 9 mm (3/8 in.) inlet hose at 620 kPa (90 psi). The starter should run smoothly. Plug the exhaust port and apply 207 kPa (30 psi) air pressure. Immerse starter in a non-flammable solvent for 30 seconds. If the starter is properly sealed, no air bubbles will appear.

Caterpillar Information System:

3406B INDUSTRIAL AND MARINE ENGINES Systems Operation
3406B INDUSTRIAL & MARINE ENGINES Pressure Regulating Valve For Air Starting Motor
3406B INDUSTRIAL & MARINE ENGINES Air Starting Motor (Ingersoll-Rand SS350)
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3406B INDUSTRIAL & MARINE ENGINES Starter Solenoids
3406B INDUSTRIAL & MARINE ENGINES Electric Starter Motors
3406B INDUSTRIAL & MARINE ENGINES Regulators
3406B INDUSTRIAL & MARINE ENGINES Alternators
3406B INDUSTRIAL & MARINE ENGINES Alternators And Regulators
3406B INDUSTRIAL & MARINE ENGINES Flywheel Housing Runout
3406B INDUSTRIAL & MARINE ENGINES Flywheel Housing Bore
3406B INDUSTRIAL & MARINE ENGINES Flywheel Runout
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Introduction
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Primary Fuel Filter
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Fuel Injection Lines (Double Walled)
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Woodward PSG Governor
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Governor Controls
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Governor Linkage
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Ether Starting Aid
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Oil Filter Group - L.H.
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Radiator
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Pressure Cap Of Cooling System
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS Belt Tightener (3N9582)
3406B INDUSTRIAL AND MARINE ENGINE ATTACHMENTS V-Belt Tension Chart
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