Usage:
Introduction
The 6V6070 Governor Adjusting Tool Group is needed to make fuel system adjustments on 3204, 3300 and 3406 Engines that are equipped with the New Scroll Fuel System. This instruction gives the information needed for tool use during the adjustment procedure.
6V6070 Governor Adjusting Tool Group
1. 6V6151 Adapter. 2. 8H9178 Bolt. 3. 0S1614 Bolt. 4. 8H3128 Bolt. 5. 5P4814 Collet. 6. 6V2014 Bracket Assembly. 7. 5B5689 Gasket. 8. 217956 Bolt. 9. 6V2017 Tool. 10. 2P8264 Socket. 11. 2P8265 Socket. 12. 2A0762 Bolt. 13. 6V7941 Compressor Assembly. 14. 6V4186 Pin. 15. 6V7942 Hook. 16. 6V2105 Tool Group (Includes 6V2104 Wrench). 17. 8T3222 Governor Adjusting Tool Group*. 18. 8T9198 Bracket Racket Assembly. 19. 6V3075 Indicator (Includes 9S0229 Point). 20. 6V6106 Indicator (Includes 6V2030 Extension and 9S8903 Point). 21. 0S1615 Bolt. 22. 6V3072 Case (Not Shown). 23. 6V6105 Block-Top (Not Shown). 24. 6V6104 Block-Bottom (Not Shown). 25. NEEG2119 Case Label (Not Shown).
*The 8T3222 Governor Adjusting Tool Group is used to adjust the high idle screw during an in-vehicle set point adjustment procedure. Refer to the Service Manual for procedure.
Fuel Setting Procedure - 3204 and 3300 Engines
| NOTICE |
|---|
The static fuel setting procedure can be done with the fuel injection pump and governor either on or off the engine. If the governor has a shutoff detent, move the control lever SLOWLY past the detent. Any rapid movement of the governor control lever to either SHUTOFF position or FULL LOAD position, can cause damage to the dial indicator. |
The revolution counter of the 6V3075 Dial Indicator must be adjusted to an approximate negative seven (-7) reading with the stem fully extended. If the dial indicator is not adjusted to this reading with the stem extended, the indicator will be difficult or impossible to zero, or the needle can slip further during use, and give an incorrect rack position reading.
Before using the tool group check the dial indicator, and either repair or replace it as necessary. After the check and/or adjustment of governor settings, use the rack centering pin to again check the zero setting. If the indicator zero setting has changed, the earlier readings obtained are not correct.
1. Remove cover (1) from the side of the fuel injection pump housing.
3. Install bracket assembly (3) on the fuel injection pump housing. Lever (A) must be in slot (B) in the fuel rack. Push up on bracket assembly (3) while the bolts are tightened.
4. After the bracket assembly is tightened to the pump housing, shaft (C) must have axial (in and out) movement. If there is no axial movement of shaft (C), check to be sure that lever (A) is in the slot (A) and is straight. It must be perpendicular (at right angles) to the base.
NOTE: If needed, an 8T3166 Bracket Assembly Repair Kit is available for replacement of lever (A) and/or shaft (C).
5. Put 9S0229 Contact Point, 9.5 mm (.375 in) long, on 6V3075 Dial Indicator (4), then install indicator (4) through collet (2) of bracket assembly (3). Remove fuel ratio control (5) and shutoff solenoid (6), if so equipped.
6. Remove plug (7) from the rear of the governor housing.
7. Move the governor control lever to the SHUTOFF position.
8. Install 6V4186 Timing Pin (8) in the hole in bracket assembly (3). Push the timing pin in until it comes into contact with the fuel rack. Hold the timing pin gently against the fuel rack for Steps 9 and 10.
| NOTICE |
|---|
Do not use more force than necessary to hold the timing pin against the fuel rack. If too much force is used to hold the timing pin, the fuel rack can stick and cause an incorrect zero reading. |
NOTE: Put the end of 6V7942 Hook (9) through the hole where plug (7) was removed. Use the end of the hook to push the fuel rack to the SHUT-OFF position.
9. Move the governor control lever to FULL LOAD and either hold or fasten it in this position.
10. Put 6V7942 Hook (9) through the hole where plug (7) was removed. Put the end of hook (9) over sleeve (10) as shown, and pull toward the rear of the governor housing until the sleeve stops moving. This will make sure the fuel rack stops against the timing pin. This is rack 0 (zero) position.
11. Loosen collet (2) and adjust the revolution counter on the dial indicator to 0 (zero). Tighten the collet just enough to hold the indicator in position. Move the dial of the indicator to get alignment of the pointer and 0 (zero).
12. Remove timing pin (8) and hook (9), then release the governor control lever.
NOTE: The 6V7941 Compressor Assembly is used to compress the overfueling spring. The overfueling spring must be compressed to get an accurate fuel setting measurement.
13. Turn rod (11) out of 6V7941 Compressor Assembly (12) until knob (13) is approximately 25 mm (1.0 in), dimension (D), from the end of the compressor body. Install 6V7941 Compressor Assembly (12) in the hole for plug (7).
NOTE: According to engine application, some fuel systems have a torque spring, and some do not. This difference in fuel systems makes it necessary to have a separate procedure for the fuel setting check and/or adjustment. Be sure to use the correct procedure (one of the two that follow) to check and/or adjust the fuel setting for your specific fuel system.
NOTE: The fuel setting can be checked without removal of the governor seals. For fuel systems with a torque spring, it will be necessary to make a dynamic check of the Full Torque Setting instead of a static check, as given in this instruction. Use the correct tools and the procedure as given in Fuel Ratio Control and Governor Check section in the Service Manual.. SEBR0544, 3406B Truck Engine.
Check and Adjustment of Fuel Setting - Fuel System WITHOUT a Torque Spring
14. Fasten the clip end of 8S4627 Circuit Tester (14) to rack contact screw (15) and the remaining end to a good ground.
15. Move the governor control lever to FULL LOAD and either hold or fasten it in this position.
16. Turn knob (13) [rod (11)] of compressor assembly (12) IN (clockwise) until the light in circuit tester (14) goes OFF, and the dial indicator needles move an additional 2 mm (.080 in) in the negative (-) direction after the light goes out (two revolutions of the large needle).
| NOTICE |
|---|
If the rod begins to tighten, DO NOT turn it in any further. Damage to the governor can occur if the rod is turned in further. |
17. Slowly turn knob (13) OUT (counterclockwise) until the light just comes on. The reading shown on the dial indicator is the Static Fuel Setting. This setting must be within ± .25 mm of the dimension given on the Engine Information Plate. If the setting is more than ± .25 mm of the dimension given on the Engine Information Plate, an adjustment is necessary. If the Engine Information Plate is missing, refer to the FUEL SETTING INFORMATION or the FUEL SETTING AND RELATED INFORMATION microfiche for the correct static fuel setting.
NOTE: When the knob (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. The indicator needles will then begin to move again, and will follow the turning of the knob until the setting is reached. It is important that the knob be turned slowly, so the fuel rack can follow the movement of the governor components.
If knob (13) is turned out too fast, it is possible to misinterpret the reading on the dial indicator as the light comes on. Do Steps 16 and 17 again to verify the reading on the dial indicator.
18. If the fuel setting is not correct, remove adjustment screw cover (16) from the rear of the governor housing.
19. To find how far the actual fuel setting is from the specified setting, see the examples that follow, and also the Adjustment Screw Chart, to decide how far adjustment screw (17) must be turned to get the correct fuel setting.
Example No. 1
Actual Reading ... 1.05 mm
Desired Setting ... 1.25 mm
Difference ... 0.20 mm
The Desired Setting is GREATER than Actual Reading:
- * Turn adjusting screw OUT (counterclockwise) 1/4 turn.
- * Check the new setting and make any adjustments that are necessary.
Example No. 2
Actual Reading ... 2.77 mm
Desired Setting ... 1.85 mm
Difference ... 0.92 mm
Desired Setting is LESS than Actual Reading:
- * Turn adjusting screw IN (clockwise) approximately 1 1/8 turn.
- * Check the new setting and make any adjustments that are necessary.
Example No. 3
Actual Reading ... -1.05 mm
Desired Setting ... -1.25 mm
Difference ... 0.20 mm
NOTE: Negative numbers work different 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.
- * Check the new setting and make any adjustments that are necessary.
Example No. 4
Actual Reading ... -2.77 mm
Desired Setting ... -1.85 mm
Difference ... 0.92 mm
The Desired Setting is GREATER than the Actual Reading:
- * Turn the adjusting screw OUT (counterclockwise) approximately 1 1/8 turns.
- * Check the new setting and make any adjustments that are necessary.
Example No. 5
Actual Reading ... 1.05 mm
Desired Setting ... -1.25 mm
Difference ... 2.30 mm
The Desired Setting is LESS than the Actual Reading:
- * Turn the adjusting screw IN approximately 2 7/8 turns.
- * Make adjustments as necessary.
Example No. 6
Actual Reading ... -1.05 mm
Desired Setting ... 1.25 mm
Difference ... 2.30 mm
The Desired Setting is GREATER than the Actual Reading:
- * Turn the adjusting screw OUT approximately 2 7/8turns.
- * Make adjustments as necessary.
20. Use 6V2105 Rack Adjustment Tool Group (18) to loosen the locknut, and turn the adjustment screw to make the necessary adjustment for the fuel setting. Tighten the locknut. Recheck the adjustment and readjust if necessary.
NOTE: When an adjustment is made the fuel setting must be adjusted to the nominal setting that is on the Engine Information Plate. The checking tolerance must not be used when making this adjustment.
21. After adjustment is complete, remove compressor assembly (12) and install the plug. Remove adjustment tool (18) and install the cover. Remove the dial indicator and bracket and install the side cover. If the fuel injection pump and governor is equipped with a fuel ratio control, refer to Governor Linkage Adjustment For Fuel Ratio Control, to check linkage adjustment.
18. Slowly turn knob (13) (overfueling spring compressor) OUT until the indicator hands stop moving, then turn the knob OUT an additional 1 - 2 turns.
19. Push IN on rack stop collar (19). The new reading on the dial indicator is the Full Torque Setting. Refer to the FUEL SETTING AND RELATED INFORMATION microfiche for the correct Full Torque Static Setting.
NOTE: On later engines, the dimensions for the Full Torque Setting is given on the Engine Information Plate. The Full Torque Setting is a direct reading on the dial indicator.
Example:
Static Fuel Setting ... 2.18 mm
Static Full Torque Setting ... 3.18 mm
Torque Rise Differential ... 1.0 mm
Previously, the Fuel Setting Information gave the torque rise differential, and it was necessary to add the fuel setting and the torque rise differential to get the setting that was to be checked.
20. If either the Static Fuel Setting or the Full Torque Setting is not correct, or if both are not correct, do the procedure that follows:
A. Determine how far the actual fuel setting and the Full Torque Setting are from the specified settings. Refer to the Adjustment Screw Chart and the examples given to determine how much each adjustment screw is to be turned.
B. Use 6V2105 Rack Adjustment Tool Group (18) to loosen the locknut and turn fuel setting adjustment screw (17) and/or full torque adjustment screw (20) the amount necessary to get the correct adjustment dimension. Be sure to tighten the locknut for each adjustment screw, after adjustment is complete.
C. Make reference to Step 16 to check each adjustment that was made. Make any corrective adjustments that are necessary. If adjustments are made, there is a zero tolerance for both the Fuel Setting dimension and the Full Torque Setting dimension.
21. If the fuel injection pump and governor is equipped with a fuel ratio control, refer to Governor Linkage Adjustment For Fuel Ratio Control to check linkage adjustment. After adjustment is complete, remove compressor assembly (12) and install the plug, remove adjustment tool (18) and install the cover. Remove the dial indicator and bracket and install the side cover.
Governor Linkage Adjustment for Fuel Ratio Control - 3204 and 3300 Engines
Governor adjustment for fuel ratio control can be done with the fuel injection pump and governor either on, or off the engine.
NOTE: Adjustment of the fuel ratio control is done dynamically. Refer to the Service Manual for the correct procedure. If the correct dynamic adjustment cannot be obtained, use the following procedure to do a check/adjust of the internal governor linkage.
If the governor adjustment tools are already installed on the fuel injection pump and governor, start with the procedure in Step 15. If it is necessary to install the governor adjustment tools, start with Step 1 that follows.
1. Remove cover (1) from the side of the fuel injection pump housing.
3. Install the bracket assembly on the fuel pump housing.
4. Lever (5) on the bracket assembly must be in slot (4) on the fuel rack. Push up on the bracket assembly while the bolts are tightened.
5. After the bracket assembly is tightened to the injection pump housing, shaft (6) must have axial (in and out) movement. If there is no axial movement of shaft (6), check to be sure lever (5) is in the slot on the fuel rack and that the bracket assembly is installed correctly. Check to make sure that lever (5) is not bent. Lever (5) must be perpendicular (at right angle) to the mounting face of the bracket assembly.
6. Put a 9S0229 Contact Point, 9.5 mm (.375 in) long on 6V3075 Dial Indicator (7), and install the dial indicator in collet (2).
7. Remove fuel ratio control (8) and shutoff solenoid from the rear of the governor housing.
8. Remove plug (9) from the rear of the governor housing.
9. Move the governor control lever to the SHUTOFF position.
10. Install 6V4186 Timing Pin (10) in the hole in the bracket assembly. Push the timing pin IN until it comes in contact with the fuel rack. Hold the timing pin gently against the fuel rack for steps 10 and 11.
| NOTICE |
|---|
Do not use more force than necessary to hold the timing pin against the fuel rack. If too much force is used to hold the timing pin, the fuel rack can stick and cause an incorrect zero reading. |
NOTE: Put the end of 6V7942 Hook (11) through the hole where plug (9) was removed. Use the end of the hook to push the fuel rack to the SHUTOFF position.
11. Move the governor control lever to FULL LOAD and either hold or fasten it in this position.
12. Put 6V7942 Hook (11) through the hole where plug (9) was removed.
13. Put the end of hook (11) over sleeve (12) as shown, and PULL toward the rear of the governor housing until the sleeve stops moving. This will make sure the fuel rack stops against the timing pin. This is the zero rack position.
14. Loosen collet (2) and adjust the revolution counter on the dial indicator to zero. Tighten the collet just enough to hold the indicator in this position. Move the dial of the indicator to get alignment of the pointer and zero.
15. Remove timing pin (10) and hook (11), then release the governor control lever.
16. Turn rod (13) out of 6V7941 Compressor Assembly (15) until knob (14) is approximately 25 mm (1.0 in), dimension (A), from the end of the compressor body.
17. Install the compressor assembly in the hole for plug (9).
18. Move the governor control lever to the FUEL OFF position. Use two 0S1614 Bolts and install 6V2017 Governor Adjustment Tool (16). Be sure the end of the tool is behind the governor linkage, and that the flange is completely against the governor housing.
NOTE: There is an orificed oil screen in the rear face of the governor housing of governors that are equipped with fuel ratio control. This screen must be removed so the 6V2017 Governor Adjustment Tool can fit flush against the housing.
Also, if it is expected that it will be necessary to change the linkage adjustment, put the outer part of 6V2105 Rack Adjustment Tool (17) along the left side of the 6V2017 Adjustment Tool (16) before the bolts are tightened.
19. Move the governor control to FULL LOAD and either hold or fasten it in this position.
20. Turn the overfueling spring compressor rod IN (clockwise), until the indicator hands move approximately 1 mm (1 revolution of the large needle).
21. Slowly turn knob (14) out [counterclockwise (CCW)] until the indicator hands stop moving. This is the Governor Linkage Setting. This setting must be within ± .25 mm of the setting in the FUEL SETTING INFORMATION or the FUEL SETTING AND RELATED INFORMATION microfiche.
NOTE: There may be a small initial movement of the dial indicator hands, then, they will stop moving while the rod is turned OUT for another 1 1/2 turns. The indicator hands will then 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 the rack can follow the movement of the governor components.
22. Refer to the FUEL SETTING INFORMATION or the FUEL SETTING AND RELATED INFORMATION microfiche setting dimension, and compare it to the dial indicator reading.
23. If the governor linkage setting is not correct, use 6V2105 Rack Adjustment Tool (17) to loosen the locknut and turn adjustment screw (18). Turn screw (18) 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 dimension when an adjustment is made.)
NOTE: One revolution of the adjustment screw will change the setting approximately 0.79 mm.
NOTE: The dial indicator hands will not follow the turning of the adjustment screw. It will be necessary to repeat Steps 19 through 23 until the correct setting is obtained.
Fuel Setting Procedure - 3406 Engines
NOTE: The Static Fuel Setting procedure can be done with the fuel injection pump and governor either on or off the engine.
| NOTICE |
|---|
If the governor has a SHUTOFF detent, move the control lever SLOWLY past the detent. Any rapid movement of the governor control lever to either SHUTOFF position or FULL LOAD position, can cause damage to the dial indicator. |
The revolution counter of the 6V6106 Dial Indicator must be adjusted to an approximate positive ten (+ 10) with the stem fully extended. If the dial indicator is not adjusted to this reading with the stem extended, the indicator will become difficult or impossible to zero, or, the needle can slip further during use, and give an incorrect rack position reading.
Before using the tool group, check the dial indicator and either repair or replace it as necessary. After the check and/or adjustment of governor settings, use the rack centering pin to again check the zero setting. If the indicator zero setting has changed, the earlier readings obtained are not correct.
1. Remove cover (1) from the side of the fuel injection pump housing
2. Install 5P4814 Collet (6) on 8T9198 Bracket Assembly (3). Install bracket assembly (3) on the pump housing so the inner lever fits into slot (A) in the fuel rack. Push up on bracket assembly (3) and install 8H9178 Ground Body Bolt (4) and 2A0762 Bolt (2). Be sure the indicator arm on bracket assembly (3) moves freely.
3. Install 6V6106 Dial Indicator (5) in collet (6). Put 9S8903 Contact Point on 6V2030 Extension, and install the extension on indicator (5).
NOTE: The 9S8903 Contact Point will not go through the collet, so it must be installed after the dial indicator stem is put through the collet.
4. Remove cover (7), or the shutoff solenoid if so equipped, and install the 6V6151 Adapter in its place. Move the governor control lever to SHUTOFF position.
NOTE: It is not necessary to remove the fuel ratio control if the fuel system is so equipped.
5. Remove the plug at location (B) and install 6V4186 Timing Pin (8). Push the timing pin IN until it comes in contact with the fuel rack.
7. Use the end of the hook as shown, to PUSH sleeve (11) and the fuel rack to the SHUTOFF position.
8. Move the governor control to FULL LOAD and either hold or fasten it in this position.
NOTE: The rack should already be against the timing pin, except in those fuel systems that use a negative rack setting.
9. Put the end of 6V7942 Hook (9) through the hole in 6V6151 Adapter (10). Put the end of hook (9) over sleeve (11) as shown, to pull the fuel rack and hold it against the timing pin.
10. Zero the dial indicator.
11. Remove timing pin (8) and hook (9), then release the governor control lever.
NOTE: The 6V7941 Compressor Assembly is used to compress the overfueling spring. The overfueling spring must be compressed to get an accurate fuel setting measurement.
12. Turn rod (12) out of 6V7941 Compressor Assembly (13) until knob (14) is approximately 25 mm (1.0 in), dimension (C), from the end of the compressor body.
NOTE: According to engine application, some fuel systems will have a torque spring, and some will not. This difference in fuel systems makes it necessary to have a separate procedure for the fuel setting check and/or adjustment. Be sure to use the correct procedure (one of the two that follow) to check and/or adjust the fuel setting for your specific fuel system.
NOTE: The fuel setting can be checked without removal of the governor seals. For fuel systems with a torque spring, it will be necessary to make a dynamic check of the Full Torque Setting instead of a static check as given in this instruction. Use the correct tools and the procedure as shown in the Fuel Ratio Control and Governor Check section of the Service Manual SEBR0544, 3406B Truck Engine.
Check and Adjustment of Fuel Setting - Fuel System WITHOUT a Torque Spring
14. Fasten the clip end of 8S4627 Circuit Tester (15) to rack contact screw (16), and the remaining end to a good ground.
15. Move the governor control lever to the FULL LOAD, and hold or fasten it in this position.
16. Turn knob (14) [rod (12)] of compressor assembly (13) IN (clockwise) until the light in circuit tester (15) goes OFF, and the dial indicator needles move an additional 2 mm in the negative (-) direction after the light goes out (two revolutions of the large needle on the dial indicator).
| NOTICE |
|---|
If the rod begins to tighten, DO NOT turn it any further. Damage to the governor can occur if the rod is turned in any further. |
17. Slowly turn knob (14) OUT (counterclockwise) until the light just comes on. The reading shown on the dial indicator is the Static Fuel Setting. This setting must be within ± .25 mm of the setting on the Engine Information Plate. If the setting is more than the ± .25 mm dimension given on the Engine Information Plate, an adjustment must be made. If the Engine Information Plate is missing, refer to the FUEL SETTING INFORMATION or the FUEL SETTING AND RELATED INFORMATION microfiche for the correct Static Fuel Setting dimension.
NOTE: When the knob (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. The indicator needles will then begin to move again, and will follow the turning of the knob until the setting is reached. It is important that the knob be turned slowly, so the fuel rack can follow the movement of the governor componets.
18. If the fuel setting is not correct, remove the adjustment screw cover from the rear of the governor housing.
19. To find how far the actual fuel setting is from the specified setting, see the examples that follow, and also the Adjustment Screw Chart, decide how far the adjustment screw must be turned to get the correct fuel setting.
NOTE: If knob (14) is turned out too fast, it is possible to misinterpret the reading on the dial indicator as the light comes on. Do Steps 16 and 17 again to verify the reading on the dial indicator.
Example No. 1
Actual Reading ... 1.05 mm
Desired Setting ... 1.25 mm
Difference ... 0.20 mm
Thee Desired Setting is GREATER than the Actual Reading:
- * Turn adjusting screw OUT (counterclockwise) 1/4 turn.
- * Check the new setting and make any adjustments that are necessary.
Example No. 2
Actual Reading ... 2.77 mm
Desired Setting ... 1.85 mm
Difference ... 0.92 mm
The Desired Setting is LESS than Actual Reading:
- * Turn adjusting screw IN (clockwise) approximately 1 1/8 turn.
- * Check the new setting and make any adjustments that are necessary.
Example No. 3
Actual Reading ... -1.05 mm
Desired Setting ... -1.25 mm
Difference ... 0.20 mm
Negative numbers work different 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.
- * Check the new setting and make any adjustments that are necessary.
Example No. 4
Actual Reading ... -2.77 mm
Desired Setting ... -1.85 mm
Difference ... 0.92 mm
The Desired Setting is GREATER than the actual reading:
- * Turn the adjusting screw OUT (counterclockwise) approximately 1 1/8 turns.
- * Check the new setting and make any adjustments that are necessary.
Example No. 5
Actual Reading ... 1.05 mm
Desired Setting ... -1.25 mm
Difference ... 2.30 mm
The Desired Setting is LESS than the Actual Reading:
- * Turn the adjusting screw IN approximately 2 7/8 turns.
- * Make adjustments as necessary.
Example No. 6
Actual Reading ... -1.05 mm
Desired Setting ... 1.25 mm
Difference ... 2.30 mm
The Desired Setting is GREATER than the Actual Reading:
- * Turn the adjusting screw OUT approximately 2 7/8turns.
- * Make adjustments as necessary.
20. Use 6V2105 Rack Adjustment Tool Group (17) to loosen the locknut, and turn the adjustment screw to make the necessary adjustment for the fuel setting. Again check the adjustment and adjust as necessary. Tighten the locknut.
NOTE: If an adjustment is made to the fuel setting, the tolerance for this dimension is zero.
21. If the fuel injection pump and governor is equipped with a fuel ratio control, refer to Governor Linkage Adjustment For Fuel Ratio Control to check linkage adjustment. After adjustment is complete, remove compressor assembly (13), adapter (10), dial indicator (5) and dial indicator bracket assembly (3). Install the plugs and covers that were removed from the pump and governor.
Check and Adjustment of Fuel Setting - Fuel System With a Torque Spring
14. Fasten the clip end of 8S4627 Circuit Tester (15) to rack contact screw (16), and the remaining end to a good ground.
15. Move the governor control lever to FULL LOAD and either hold or fasten it in this position. Remove cover (16).
16. Turn knob (14) [rod (12)] of compressor assembly (13) 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 (two revolutions of the large needle on the dial indicator).
| NOTICE |
|---|
If the rod begins to tighten, DO NOT turn it in any further. Damage to the governor can occur if the rod is turned in further |
17. Slowly turn knob (14) OUT (counterclockwise) until the light just comes on. The reading shown on the dial indicator is the Static Fuel Setting. This setting must be within ± .25 mm of the dimension given on the engine information plate. If the setting is more than ± .25 mm of the dimension given on the Engine Information Plate, an adjustment must be made. If the Engine Information Plate is missing from the engine, refer to FUEL SETTING INFORMATION or the FUEL SETTING AND RELATED INFORMATION microfiche for the correct Static Fuel Setting dimension.
NOTE: When the knob (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. The indicator needles will then begin to move again and will follow the turning of the knob until the setting is reached. It is important that the knob be turned slowly, so the fuel rack can follow the movement of the governor components.
NOTE: If knob (14) is turned out too fast, it is possible to misinterpret the reading on the dial indicator as the light comes on. Do Steps 16 and 17 again to verify the reading on the dial indicator.
18. Slowly turn knob (14) OUT until the dial indicator needles stop moving, then turn the rod OUT an additional 1 - 2 turns. Remove adjustment screw cover at rear of governor and push IN on rack stop collar (19). The new reading on dial indicator (5) is the Static Full Torque Setting. Refer to the FUEL SETTING INFORMATION or the FUEL SETTING AND RELATED INFORMATION microfiche for the correct Static Full Torque Setting dimension.
NOTE: On later engines, the dimension for the Full Torque Setting is given on the Engine Information Plate. The Full Torque Setting is a direct reading on the dial indicator.
Example:
Static Fuel Setting ... 2.18 mm
Static Full Torque Setting ... 3.18 mm
Torque Rise Differential ... 1 mm
Previously, the Fuel Setting Information gave the torque rise differential, and it was necessary to add the fuel setting and the torque rise differential to get the setting that was to be checked.
19. If the setting is not correct, use the procedure that follows to find how far the actual Full Torque Setting and the Fuel Setting are from the dimensions given in the specifications. Refer to the Adjustment Screw Chart and the examples to decide how far the adjustment screws must be turned to get the correct fuel setting.
Example No. 1
Actual Reading ... 1.05 mm
Desired Setting ... 1.25 mm
Difference ... 0.20 mm
The Desired setting is GREATER than the actual reading:
- * Turn adjusting screw OUT (counterclockwise) 1/4 turn.
- * Check the new setting and make any adjustments that are necessary.
Example No. 2
Actual Reading ... 2.77 mm
Desired Setting ... 1.85 mm
Difference ... 0.92 mm
The Desired Setting is LESS than actual reading:
- * Turn adjusting screw IN (clockwise) approximately 1 1/8 turn.
- * Check the new setting and make any adjustments that are necessary.
Example No. 3
Actual Reading ... -1.05 mm
Desired Setting ... -1.25 mm
Difference ... 0.20 mm
Negative numbers work different 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 LESS than the Actual Reading:
- * Turn the adjusting screw IN (clockwise) approximately 1/4 turn.
- * Check the new setting and make any adjustments that are necessary.
Example No. 4
Actual Reading ... -2.77 mm
Desired Setting ... -1.85 mm
Difference ... 0.92 mm
The Desired Setting is GREATER than the Actual reading:
- * Turn the adjusting screw OUT (counterclockwise) approximately 1 1/8 turns.
- * Check the new setting and make any adjustments that are necessary.
Example No. 5
Actual Reading ... 1.05 mm
Desired Setting ... -1.25 mm
Difference ... 2.30 mm
The Desired Setting is LESS than the Actual Reading:
- * Turn the adjusting screw IN approximately 2 7/8 turns.
- * Make adjustments as necessary.
Example No. 6
Actual Reading ... -1.05 mm
Desired Setting ... 1.25 mm
Difference ... 2.30 mm
The Desired Setting is GREATER than the Actual Reading:
- * Turn the adjusting screw OUT approximately 2 7/8turns.
- * Make adjustments as necessary.
20. Use 6V2105 Rack Adjustment Tool Group (17) to turn Fuel Setting Screw (20) and/or Full Torque Adjustment Screw (21) the amount necessary to get the correct adjustment dimension. Be sure to tighten the locknut for each adjustment screw, after adjustment is complete.
21. Make reference to step (16) to check each adjustment that was made. Make any corrective adjustments that are necessary. If adjustments are made, there is a zero tolerance for both the Fuel Setting dimension and the Full Torque Setting dimension.
NOTE: If the adjustment procedure is being done with the fuel system on the engine and it is difficult to see the adjustment screws, use outer edge (D) of the opening in the governor housing as a guide to put 6V2105 Rack Adjustment Tool on the Fuel Setting Adjustment Screw. Use inner edge (E) as a guide to put the 6V2105 Rack Adjustment Tool on the Full Torque Adjustment Screw.
22. If the fuel injection pump and governor is equipped with a fuel ratio control, refer to Governor Linkage Adjustment For Fuel Ratio Control to check linkage adjustment. After adjustment is complete, remove compressor assembly (13), adapter (10), dial indicator (5) and dial indicator bracket assembly (3). Install the plugs and covers that were removed from the pump and governor.
Governor Linkage Adjustment for Fuel Ratio Control -3406 Engines
Governor adjustment for the fuel ratio control can be done with the fuel injection pump and governor either on, or off the engine.
NOTE: Adjustment of the fuel ratio control is done dynamically. Refer to the Service Manual for the correct procedure. If the correct dynamic adjustment cannot be obtained, use the following procedure to do a check/adjust of the internal governor linkage.
If the governor adjustment tools are already installed on the fuel injection pump and governor, start with the procedure in Step 13. If it is necessary to install the governor adjustment tools, start with Step 1 that follows.
1. Remove cover (1) from the side of the fuel injection pump housing. Remove plug (2) from the timing pin hole.
2. Install 5P4814 Collet (2) on 8T9198 Bracket Assembly (3). Install bracket assembly (3) on the fuel injection pump housing as shown. Install 8H9178 Ground Body Bolt (4) first, then install 2A0762 Bolt (5).
3. Install 6V6106 Dial Indicator (6) in collet (2). Put 9S8903 Contact Point on 6V2030 Extension (7), then install the extension on dial indicator (69).
NOTE: The 9S8903 Contact Point will not go through the collet, so it must be installed after the dial indicator stem is put through the collet.
4. Tighten collet (2) just enough to hold the dial indicator.
5. Remove the shutoff solenoid if so equipped, or the cover, and install 6V6151 Adapter (8) in its place. Move governor control lever to SHUTOFF position.
6. Put 6V4186 Timing Pin (9) in the hole where plug (2) was removed. Push the timing pin IN until it comes in contact with the fuel rack.
7. Put the end of 6V7942 Hook (10) through the hold in 6V66151 Adapter (8).
8. Use the end of the hook as shown, to PUSH sleeve (11) and the fuel rack to the SHUTOFF position.
9. Move the governor control to FULL LOAD and either hold or fasten it in this position.
NOTE: The rack should already be against the timing pin, except in some fuel systems that use a negative (-) rack setting.
10. Put the end of 6V7942 Hook (10) through the hole in 6V6151 Adapter (8). Put the end of hook (10) over sleeve (11) as shown, to pull the fuel rack and hold it against the timing pin.
11. Zero the dial indicator.
12. Remove timing pin (9) and hook (10), then release the governor control lever.
13. Turn rod (12) out of 6V7941 Compressor Assembly (13) until knob (14) is approximately 25.4 mm (1.0 in), dimension (B), from the end of the compressor body. Install 6V7914 Compressor Assembly (13) in 6V6151 Adapter (8) as shown.
NOTE: The 6V7941 Compressor Assembly is used to compress the overfueling spring. The overfueling spring must be compressed to get an accurate fuel setting measurement.
14. Remove air supply line (15) and fuel ratio control (16).
15. Remove the orifice screen assembly from the governor housing at location (C) This screen must be removed so 6V2017 Governor Adjustment Tool (17) can fit square against the governor housing.
16. Move the governor control lever to SHUTOFF position and install 6V2017 Governor Adjusting Tool (17).
NOTE: If it is thought that it will be necessary to change linkage adjustment, install outer part (18) of 6V2105 Rack Adjusting Tool along the left side of governor adjusting tool (17).
17. Move the governor control lever to FULL LOAD position and hold it there.
18. Turn knob (14) so the rod in overfueling spring compressor (13) goes IN until the needles of the dial indicator move approximately 1 mm (one revolution of the large needle).
19. Slowly turn knob (14) OUT until the indicator hands stop moving. This is the GOVERNOR LINKAGE SETTING. This setting must be within ± .25 mm of the setting in the Fuel Setting Information.
NOTE: When the knob (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 knob be turned slowly, so the fuel rack can follow the movement of the governor components.
20. Refer to the FUEL SETTING INFORMATION or FUEL SETTING AND RELATED INFORMATION microfiche for the correct Governor Linkage Setting dimension, and compare it to the dial indicator reading.
21. If an adjustment is necessary, use outer part (18) of 6V2105 Rack Adjusting Tool to loosen the locknut and then use the 6V2104 Hex Wrench (19) (part of the 6V2105 Rack Adjusting Tool) to turn the adjusting 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 dimension when an adjustment is made.)
NOTE: The needles of the dial indicator will not follow the turning of the adjusting screw. It will be necessary to do Steps 18-21 until the adjustment is correct.