- Engine:
- 3456 (S/N: 9BZ1-399)
Introduction
This procedure is for a replacement of the front drive gears on the 3456 engine (S/N: 9BZ1-399). When the installation is complete on all of the engines, discard all of the special tools and the special instruction. This procedure will be used only for the 3456 (S/N: 9BZ) in order to change the front drive gears.
You will want to run the Troubleshooting, "Engine Speed/Timing Sensor - Calibrate" in order to ensure correct timing when you complete the following procedure and when the engine is installed.
Tools, Special Tools, and Parts that are Required
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Name | Qty |
| A | 1P-2328 (1) | Screw | 1 |
| 1P-2327 (1) | Head | 1 | |
| 3H-0464 (1) | Bolt | 2 | |
| 4S-5415 (1) | Arm - Puller | 2 | |
| A | 214-7340 | Ratchet Wrench Gp | 1 |
| B | 9S-9082 | Engine Turning Tool | 1 |
| C | 1P-2321 | Combination Puller | 1 |
| D | - | Guide Bolt (5/8 inch - 18 NF by 7 inch) | 1 |
| E | 4C-5593 | Anti-Seize Compound | 1 |
| F | 1U-7600 | Slide Hammer Puller Gp | 1 |
| G | 5P-1733 | Seal Locator | 1 |
| H | 5P-1737 | Bolt | 3 |
| J | 9S-8858 | Nut (Seal Installer) | 1 |
| K | 6V-6142 | Seal Installer | 1 |
| L | 1P-0510 | Driver Group | 1 |
| M | 9S-3263 | Thread Lock Compound | 1 |
| N | 8T-2998 | Lubricant | 1 |
| P | 8T-9022 | Silicone Gasket | 1 |
| Q | 9U-7255 | Gear Gauge | 1 |
| R | 9U-7324 | Indicator Bracket (2) | 1 |
| 7H-1942 | Dial Indicator (2) | 1 | |
| 3S-3268 | Indicator Contact Point (2) | 1 | |
| 7H-1940 | Universal Attachment (2) | 1 | |
| S | FT-2996 | Refer to Illustration 1. | 1 |
| T | 9U-6896 | Guide Bolt | 1 |
| ( 1 ) | Part is from 1P-2322 Combination Puller . |
| ( 2 ) | Part is from 9U-7530 Engine Tool Group . |
 | |
| Illustration 1 | g01051617 |
Tooling (S) for installation of the crankshaft gear | |
| Required Parts | ||
|---|---|---|
| Qty | Part Number | Part Name |
| 1 | 166-9944 | Gasket |
| 1 | 4N-3661 | Oil Pan Gasket |
| 1 | 2W-1733 | Crankshaft Seal Gp |
| 1 | 248-3008 | Stub shaft |
| 1 | 244-1640 | Cam Gear Gp |
| 12 | 0S-1585 | Bolt |
| 6 | 1A-3203 | Bolt |
| 1 | 6N-7654 | Spacer |
| 1 | 167-8130 | Damper |
| 1 | 227-3704 | Damper Adapter |
| 1 | 187-8981 | Crankshaft Gear |
| 1 | 187-8979 | Gear |
| 1 | 149-9110 | Oil Pump Drive Gear |
| 1 | 153-9023 | Gear |
Front Drive Gears - Remove
Front Support Bracket - Remove
- Use a suitable lifting device in order to support the front of the engine.
- Remove the tubing from the lower part of the water pump.
- Remove the bolts that hold the support bracket on the frame.
- Remove the bolts that hold the support bracket on to the housing (front).
Vibration Damper - Remove
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
- Remove two bolts (1). Install Tooling (D) .
 | |
| Illustration 2 | g01052829 |
Typical example | |
- Remove remaining bolts (1). Remove plate (2). Remove vibration damper (3) from adapter (4). The weight of the vibration damper is approximately 15 kg (33 lb).
- Remove Tooling (D) from the crankshaft.
Crankshaft Front Seal - Remove
Note: The crankshaft front seal and the wear sleeve must be replaced at the same time. Once the crankshaft front seal and the wear sleeve are separated, these components can not be used again.
- Use Tooling (F) or a punch and hammer in order to puncture three or more holes in wear sleeve (6) and crankshaft front seal (5) .
 | |
| Illustration 3 | g01052404 |
- Use Tooling (F) to remove the wear sleeve and the crankshaft front seal.
Oil Pan - Remove
- Remove the left dipstick and the right dipstick.
- Drain the oil from the engine oil pan into a suitable container for storage or disposal.
- Remove the bolts that fasten the oil pan to the engine block or the housing (front).
- Remove engine oil pan.
Front Cover - Remove
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
- Remove screws (9), bolts (7), and nuts (10) .
 | |
| Illustration 4 | g01052408 |
- Remove front cover (8) .
Finding the Top Center Position for No. 1 Piston
The No. 1 piston at top center (TC) on the compression stroke is the starting point of all timing procedures.
Note: Some engines have 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.
 | |
| Illustration 5 | g01052409 |
Locating Top Center (11) Timing bolt (12) Timing bolt location (13) Cover | |
- Timing bolt (11) is a cover bolt. The timing bolt can be installed in either the left side of the engine at location (12) or in the right side of the engine at timing bolt location (12). Remove both bolts (11) and cover (13) from the flywheel housing. Remove the plug from the timing hole in the flywheel housing.
- Put timing bolt (11) (long bolt that holds the cover on the flywheel housing) through the timing hole in the flywheel housing. Tooling (B) and a 1/2 inch ratchet are used in order to turn the engine flywheel. Normal engine rotation is counterclockwise. Turn the engine flywheel until the timing bolt engages with the threaded hole in the flywheel.
- Remove the front valve mechanism cover from the engine.
 | |
| Illustration 6 | g01052410 |
Using 9S-9082 Engine Turning Tool (11) Timing bolt (B) Tooling | |
Note: If the flywheel is turned beyond the point of engagement, the flywheel must be turned in the opposite direction of normal engine rotation approximately 45 degrees. Then turn the flywheel in the direction of normal rotation until the timing bolt engages with the threaded hole. The procedure will eliminate the backlash that will occur when the No. 1 piston is put on the top center.
- The inlet and exhaust valves for the No. 1 cylinder are fully closed if the No. 1 piston is on the compression stroke and the rocker arms can be moved by hand. If the rocker arms can not be moved and the valves are slightly open the No. 1 piston is on the exhaust stroke.
Note: After the actual stroke position is identified, and the other stroke position is needed, remove the timing bolt from the flywheel. The flywheel is turned 360 degrees in a counterclockwise direction. The timing bolt is reinstalled.
Camshaft Gear - Remove
- Verify that the timing mark on camshaft gear (14) is aligned with Timing Mark (X) on front housing (16) .
 | |
| Illustration 7 | g01052412 |
- Remove top bolt (15) from camshaft gear (14). Install Tooling (T) in place of the bolt.
- Remove remaining bolts (15) and remove camshaft gear (14) .
 | |
| Illustration 8 | g01052413 |
- Remove Tooling (T) .
| NOTICE |
|---|
Do not turn the crankshaft or the camshaft while the camshaft gear is removed. If the front gear group is not correctly timed during installation, interference can occur between the pistons and the valves, resulting in damage to the engine. |
Inspect the Adapter for the Camshaft gear
- Remove the thrust plate.
 | |
| Illustration 9 | g01076163 |
- Remove the adapter for the cam gear.
- Remove the seal plate.
- Check the part number for the adapter. The part number should be 115-9549 Adapter . Replace the adapter if the adapter is not the 115-9549 Adapter .
Note: 115-9549 Adapter is a part of the 128-8853 Adapter As . 128-8853 Adapter As is the 115-9549 Adapter and 6V-3677 Dowel .
- Check the thickness of the adapter. Replace the adapter if the adapter is not 18.59 mm (0.740 inch) thick.
- Check the part number for the seal plate. The part number should be 117-8557 Seal Plate .
- Check the thickness of the seal plate. Replace the seal plate if the seal plate is not 7.5 mm (0.30 inch) thick.
- If all of the inspected parts are correct, replace all of the parts that are required to be replaced in the above steps. Go to ""Housing (Front) - Remove" ".
Note: The camshaft will be to far forward in the engine if the incorrect adapter or the incorrect seal plate is found.
- If the incorrect adapter is found or if the incorrect seal plate is found, remove the tension from the camshaft before you install the correct seal plate and the correct adapter.
- Remove the valve mechanism covers.
Note: When the engine is reassembled you will need to check the engine valve lash. Refer to ""Check the Engine Valve Lash" ".
- Loosen the four bolts for each rocker arm shaft. This will release the tension on the camshaft in order to slide the camshaft back into the correct position.
- When the inspection is complete, install the following parts: seal plate, adapter for the camshaft gear and thrust plate.
Note: Do not tighten the bolts for the rocker arm shaft until the following items are installed: seal plate, adapter for the camshaft gear and thrust plate.
Housing (Front) - Remove
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
| NOTICE |
|---|
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
- Remove bolts (18) that fasten front plate (17) to front housing (16) .
| NOTICE |
|---|
Do not turn the crankshaft or the camshaft while the camshaft gear is removed. If the front gear group is not correctly timed during installation, interference can occur between the pistons and the valves, resulting in damage to the engine. |
 | |
| Illustration 10 | g01052414 |
Typical example | |
- Remove bolts (19), nut (21), and nuts (20) from front housing (16) .
 | |
| Illustration 11 | g01052417 |
Typical example | |
- Remove front housing (16) .
 | |
| Illustration 12 | g01052418 |
Typical example | |
- Remove gasket (22) from front plate (17) .
 | |
| Illustration 13 | g01052419 |
Typical example | |
Gear Group (Front) and Water Pump - Remove
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
| NOTICE |
|---|
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
- Loosen the Bolt for the water pump.
- Install Tooling (C) onto the water pump gear and remove the water pump gear.
 | |
| Illustration 14 | g01052420 |
- Remove bolts (24), plate (25), and adjustable idler gear (23) .
 | |
| Illustration 15 | g01052424 |
Typical example | |
- Remove bolts (27), plate (28), and idler gear (26) .
 | |
| Illustration 16 | g01052440 |
Typical example | |
- Remove bolts (30), plate (31), and cluster gear (29) .
 | |
| Illustration 17 | g01052425 |
Typical example | |
- Remove bolts (32) and stub shaft (33) from the engine block.
 | |
| Illustration 18 | g01052427 |
Typical example | |
Oil Pump, 1 Main Bearing Cap, and Bearing - Remove
- Install Tooling (C) onto the gear for the engine oil pump. Remove the gear for the engine oil pump with Tooling (C) .
 | |
| Illustration 19 | g01052224 |
- Remove the oil supply tube.
- Remove the suction bell and tube assembly.
- Remove the bolts that hold the oil pump on the cylinder block.
- Remove the bolts that hold the main bearing cap and remove the 1 main bearing (both pieces).
 | |
| Illustration 20 | g01052277 |
Crankshaft Gear - Remove
- Assemble the puller group and install the puller on the crankshaft gear.
Note: You may need to grind approximately 2 mm (0.08 inch) off of the end of a jaw. This will help to clear the block. The rated capacity for the jaw will be decreased, if you grind the jaw. When the job is complete on all engines that require the replacement of the front drive train discard the jaw.
 | |
| Illustration 21 | g01052283 |
- Tighten the forcing screw until you have moderate pressure on the forcing screw.
- Reinstall two of the front damper bolts in order to catch the gear.
- In order to avoid damaging the gasket for the plate to the engine block, raise the temperature of the crankshaft gear inside the arrows that is shown in Illustration 22. Use a torch to raise the temperature of the gear to 107 °C (225 °F).
 | |
| Illustration 22 | g01052959 |
Locations for heating the crankshaft gear | |
- Continue to add pressure as you raise the temperature of the gear. The gear should pop off the shaft.
- Allow gear to cool.
Installation of the Front Drive Gears
New Crankshaft Gear - Install
- Raise the temperature of the gear to a maximum temperature of 177 °C (350 °F). Install the gear on the crankshaft with the keyway in alignment with the dowel. The gear must be evenly heated.
| NOTICE |
|---|
Do not use a torch to heat the gear. A torch can unevenly heat the gear causing warpage. The hardness of the gear may also be changed with the use of a torch. |
Note: Do not apply heat to the crankshaft for more than one hour.
- Place the gear onto the crankshaft. Hold the gear in place with Tooling (S). Use two bolts from the damper in order to install Tooling (S) in place.
 | |
| Illustration 23 | g01052453 |
Note: Tooling (S) is recommended in order to install the crankshaft. You may not get the gear on with the allowed temperature.
- Continue to apply pressure until the gear is fully installed.
- Allow the gear to cool.
Oil Pump, 1 Main Bearing Cap, and Bearing - Install
- Install the 1 main bearing.
- Install the main bearing cap and the bolts for the main bearing.
| | |
| Illustration 24 | g01052277 |
- Tighten the bolts for the 1 main bearing cap, as follows:
- Tighten the bolt first on the bearing tab side of the main bearing cap to a torque of 260 ± 14 N·m (190 ± 10 lb ft).
- Tighten the bolt opposite the bearing tab side to a torque of 260 ± 14 N·m (190 ± 10 lb ft).
- Put a mark on each bolt and on each main bearing cap.
- Tighten the bolt opposite the bearing tab side for an additional 120 ± 5 degrees (2 flats).
- Tighten the bolt on the bearing tab side for an additional 120 ± 5 degrees (2 flats).
- Position the oil pump on the dowels in the cylinder block. Install the bolts for the engine oil pump.
Note: Ensure that the engine oil pump is seated on the dowels before the bolts for the oil pump are tightened.
- Install the oil supply tube assembly.
- Install suction bell and tube assembly.
- Install the key on the shaft of the oil pump.
- Install the drive gear for the oil pump. Install the bolt for the drive gear. Tighten the drive gear to a torque of 55 ± 10 N·m (40.6 ± 7.4 lb ft).
Gear Group (Front) - Install
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
- Clean the front of the gear plate.
- Apply Tooling (M) to bolts (32).
| | |
| Illustration 25 | g01052427 |
Typical example | |
 | |
| Illustration 26 | g00537659 |
Bolt tightening sequence for stub shaft (33) | |
- Install 248-3008 Stub shaft (33). Tighten bolts (32) to a torque of 55 ± 10 N·m (41 ± 7 lb ft) in a sequence (1, 3, 4, 5, 2, 1, 2, 3, 4, 5, 1). Refer to illustration 26.
- Put 187-8979 Cluster Gear (29) on stub shaft (33). Ensure that timing Marks (V) are aligned on cluster gear and the crankshaft gear. Apply Tooling (M) to bolts (30). Install plate (31) and bolts (30). Tighten bolts (30) to a torque of 30 ± 7 N·m (22 ± 5 lb ft).
| | |
| Illustration 27 | g01052425 |
Typical example | |
 | |
| Illustration 28 | g00516404 |
Typical example | |
- Check the backlash for the camshaft gear and the adjustable idler gear. ""Gear Group (Front) - Time" "
- Put idler gear (26) on the fixed idler stub shaft. Apply Tooling (P) to bolts (27). Install plate (28) with the oil groove toward the gear face. Install bolts (27) and tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft).
| | |
| Illustration 29 | g01052440 |
Typical example | |
- Install water pump gear. Install the washer and the bolt for the water pump gear. Tighten the bolt to a torque of 215 ± 40 N·m (159 ± 30 lb ft).
Housing (Front) - Install
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
- Thoroughly clean the old gasket material from front plate (17). Install a new gasket (22) on front plate (17) .
| NOTICE |
|---|
Do not turn the crankshaft or the camshaft while the camshaft gear is removed. If the front gear group is not correctly timed during installation, interference can occur between the pistons and the valves, resulting in damage to the engine. |
| | |
| Illustration 30 | g01052419 |
Typical example | |
- Thoroughly clean the old gasket material from front housing (16) and install front housing (16) on the two dowel pins.
| | |
| Illustration 31 | g01052418 |
Typical example | |
- Install bolts (19), nut (20), and nuts (21) on front housing (16) .
| | |
| Illustration 32 | g01052417 |
Typical example | |
- Install bolts (18) that fasten front plate (17) to front housing (16) .
| | |
| Illustration 33 | g01052414 |
Typical example | |
Static Check Of The Timing Gear Position
 | |
| Illustration 34 | g01052479 |
Front gear group (V) Timing mark (X) Timing mark (14) Camshaft gear (23) Adjustable idler gear (26) Idler gear (29) Cluster gear (34) Crankshaft gear (35) Oil pump gear | |
The basis for the correct fuel injection timing and the valve mechanism operation is determined by the alignment of the timing marks for the front gear group. Timing marks (X) and timing marks (V) are aligned in order to provide the correct relationship between the piston movement and the valve movement.
Cam Gear - Install
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
- Install Tooling (T) in the top hole in the camshaft.
| | |
| Illustration 35 | g01052413 |
| NOTICE |
|---|
Do not turn the crankshaft or the camshaft while the camshaft gear is removed. If the front gear group is not correctly timed during installation, interference can occur between the pistons and the valves, resulting in damage to the engine. |
- Align the hole in the back of camshaft gear (14) with the dowel in the adapter. Install 244-1640 Cam Gear (14) over Tooling (T) .
- Verify that the timing mark on camshaft gear (14) is aligned with timing mark (X) on front housing (16) .
| | |
| Illustration 36 | g01052412 |
Note: Camshaft timing is critical. The timing mark on the camshaft gear must be aligned with the timing mark on the front cover when the No. 1 piston is at the top center of the compression stroke. Refer to Testing and Adjusting, "Gear Group (Front) - Time".
- Install bolts (15). Remove Tooling (T) and install remaining bolt (15) .
- Tighten bolts (15) in a numeric sequence 1, 4, 2, 5, 3, 6, 1, 4 to a torque of 240 ± 40 N·m (180 ± 30 lb ft). Refer to illustration 37.
 | |
| Illustration 37 | g00593987 |
- Check the backlash between the camshaft gear and the adjustable idler gear. The backlash should be 0.216 ± 0.114 mm (0.0085 ± 0.0045 inch). Refer to Testing and Adjusting, "Gear Group (Front) - Time" for the backlash adjustment procedure.
Gear Group (Front) - Time
Setting Backlash For Camshaft And Adjustable Idler Gear
- Remove the adjustable idler gear from stub shaft (37). Stub shaft (37) is held in position with five nuts (36) and bolt (36). Loosen five nuts (36) and loosen bolt (38) .
 | |
| Illustration 38 | g01053460 |
Loosen stub shaft assembly. (36) Nuts (37) Stub shaft | |
- Refer to Illustration 39 in order to position Tooling (Q). Move Tooling (Q) to the left and to the right. Lightly tighten nuts (36) and bolt (38). Once the nuts and the bolt are tightened, lightly tap Tooling (Q) with a rubber mallet on the sides. This will ensure that the tool is properly seated. Tooling (Q) should be free to move in and out without any binding. Tighten the nuts and the bolt to a torque of 55 ± 10 N·m (41 ± 7 lb ft).
 | |
| Illustration 39 | g01084023 |
Installation of the adjustable idler assembly (Q) Gear gauge (36) Nuts (38) Bolt | |
- Install Tooling (R) on the timing gear housing. When idler gear assembly (23) is held stationary, the backlash between the camshaft gear (14) and the idler gear (23) is 0.216 ± 0.114 mm (0.0085 ± 0.0045 inch).
 | |
| Illustration 40 | g01084022 |
Checking backlash (R) Indicator assembly (14) Camshaft gear (23) Idler gear assembly | |
- If necessary, repeat step 1 through step 3 in order to obtain the proper backlash.
Cover (Front) - Install
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
- Inspect seal (39). If seal (39) is worn or damaged, replace the seal. Install seal (39) in front cover (8) .
 | |
| Illustration 41 | g01053160 |
- Install front cover (8), screws (9), bolts (7), and nuts (10) .
| | |
| Illustration 42 | g01052408 |
Typical example | |
- Tighten bolts (7) and nuts (10) .
Note: Do not tighten screws (9) until bolts (7) and nuts (10) have been properly tightened.
- Tighten button head screw (9) in the numerical sequence that is shown in Illustration 43 to the torque of 13 ± 3 N·m (10 ± 2 lb ft).
 | |
| Illustration 43 | g00563307 |
Tightening sequence for screws | |
Crankshaft Seal (Front) - Install
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
Note: The crankshaft front seal and the wear sleeve must be replaced at the same time. Once the crankshaft front seal and the wear sleeve are separated, these components cannot be used again.
Note: Do not use any type of lubricant during the installation of the crankshaft front seal and the wear sleeve.
- Fasten Tooling (G) to the crankshaft with Tooling (H) .
 | |
| Illustration 44 | g01084021 |
- Position wear sleeve (6) and crankshaft front seal (5) on Tooling (K). Install Tooling (K) on Tooling (G). Lubricate the face of the washer on Tooling (J). Install Tooling (J) on Tooling (G) .
Note: Install the crankshaft front seal with the arrow that shows the direction of crankshaft rotation toward the front of the engine.
- Tighten Tooling (J) until Tooling (K) contacts Tooling (G) .
- Remove Tooling (J), and Tooling (K) from Tooling (G) .
- Remove Tooling (G) and Tooling (H) from the crankshaft.
Vibration Damper - Install
- Install Tooling (D) in the crankshaft.
| | |
| Illustration 45 | g01052829 |
Typical example | |
- Install 227-3704 Damper Adapter (3) on Tooling (D).
- Install 167-8131 Damper (4) on Tooling (D). The weight of the vibration damper is approximately 15 kg (33 lb).
- Install 6N-7654 Spacer (2) on Tooling (D) .
- Apply Tooling (E) to bolts (1). Install the bolts. Remove Tooling (D) and install the remaining bolts.
Check the Engine Valve Lash
| Valve Lash | |
| Valves | Gauge Dimension |
| Inlet | 0.38 mm (0.015 inch) |
| Exhaust | 0.76 mm (0.030 inch) |
- Make an adjustment to the valve lash on the inlet valves 1, 2, and 4.
- Loosen the valve adjustment locknut.
- Place the appropriate feeler gauge between the inlet rocker arm and the inlet valve bridge. Turn inlet adjustment screw while the valve adjustment locknut is being held from turning. Adjust the valve lash until the correct specification is achieved.
- After each adjustment, tighten the valve adjustment locknut while valve adjustment screw is being held from turning. Tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Recheck each adjustment.
- Make an adjustment to the valve lash on the exhaust valves 1, 3, and 5.
- Loosen the valve adjustment locknut .
- Place the appropriate feeler gauge between the exhaust rocker arm and the exhaust valve bridge. Turn exhaust adjustment screw while the valve adjustment locknut is being held from turning. Adjust the valve lash until the correct specification is achieved.
- After each adjustment, tighten the valve adjustment locknut while valve adjustment screw is being held from turning. Tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Recheck each adjustment.
- Remove the timing bolt, and turn the flywheel by 360 degrees in the direction of engine rotation. This will position the No. 6 piston at the top center on the compression stroke. Install the timing bolt in the flywheel.
- Make an adjustment to the valve lash on the inlet valves 3, 5, and 6.
- Loosen the valve adjustment locknut.
- Place the appropriate feeler gauge between the inlet rocker arm and the inlet valve bridge. Turn inlet adjustment screw while the valve adjustment locknut is being held from turning. Adjust the valve lash until the correct specification is achieved.
- After each adjustment, tighten the valve adjustment locknut while valve adjustment screw is being held from turning. Tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Recheck each adjustment.
- Make an adjustment to the valve lash on the exhaust valves 2, 4, and 6.
- Loosen the valve adjustment locknut .
- Place the appropriate feeler gauge between the exhaust rocker arm and the exhaust valve bridge. Turn exhaust adjustment screw while the valve adjustment locknut is being held from turning. Adjust the valve lash until the correct specification is achieved.
- After each adjustment, tighten the valve adjustment locknut while valve adjustment screw is being held from turning. Tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Recheck each adjustment.
Mark the Engine When the Change is Complete
 | |
| Illustration 46 | g01074567 |
Left side of the engine with the marking | |
 | |
| Illustration 47 | g01074568 |
Right side of the engine with the marking | |
Once the rework is complete use a stamp and mark the engine with a "S" on the left side of the engine and the right side of the engine. Refer to Illustration 46 and Illustration 47 for the correct location of the mark.