3306C Truck Engine Caterpillar

Fuel Setting Procedure

The static fuel setting can be determined with the fuel injection pump on the engine or with the fuel injection pump off the engine. For more information, see Special Instruction, SEHS8024.

Illustration 1	g00319835
Fuel Injection Pump and Governor (1) Cover.

1. Remove cover (1) from the side of the fuel injection pump housing.

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Illustration 2	g00319836
Installed Bracket Assembly (2) 5P-4814 Collet. (3) 6V-2014 Bracket assembly .

2. Install 5P-4814 Collet (2) onto 6V-2014 Bracket Assembly (3) .

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Illustration 3	g00319837
Removed Cover (4) Slot on the fuel rack.

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Illustration 4	g00319838
6V-2014 Bracket Assembly (5) Lever. (6) Shaft.

3. Install 6V-2014 Bracket Assembly (3) onto the fuel injection pump housing. Make sure that lever (5) on the bracket assembly fits slot (4) on the fuel rack.

   After the 6V-2014 Bracket Assembly (3) is tightened to the fuel injection pump housing, shaft (6) must have axial movement. Axial movement alternates between a clockwise movement and a counterclockwise movement.

   If there is no axial movement, make sure of these conditions:

   • Lever (5) fits correctly in the slot (4) on the fuel rack.

   • The bracket assembly is attached correctly.

   • Lever (5) is not bent.

   Remember that lever (5) must be at a right angle (perpendicular) to the mounting face of the bracket assembly.

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Illustration 5	g00319839
Installed Dial Indicator (7) 6V-3075 Dial Indicator .

4. 9S-0229 Contact Point measures 9.7 mm (0.38 inch) long. Attach this contact point onto 6V-3075 Dial Indicator (7). Also install the dial indicator in 5P-4814 Collet (2) .

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Illustration 6	g00319925
Governor (8) Fuel air ratio control.

5. Remove fuel air ratio control (8) from the rear of the governor housing.

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Illustration 7	g00321104
Rear of Governor Housing (9) Plug.

6. Remove plug (9) from the rear of the governor housing.

7. Move the governor control lever to the FUEL-OFF position. This can be done by rotating the governor shaft clockwise.

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Illustration 8	g00319943
Installed Timing Pin (10) 6V-4186 Fuel Pump Timing Pin .

8. Install 6V-4186 Fuel Pump Timing Pin (10) into the hole in the bracket assembly.

   1. Push in fuel pump timing pin (10) until this timing pin contacts the fuel rack.

   2. Hold the fuel pump timing pin (10) gently against the fuel rack for Steps 9 and 11.

      If too much force is used to hold the fuel pump timing pin (10), the fuel rack can stick. This sticking can produce an incorrect zero reading.

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Illustration 9	g00319963
Using 6V-7942 Hook (11) 6V-7942 Hook .

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Illustration 10	g00320023
Cutaway View of Governor (11) 6V-7942 Hook. (12) Collar.

9. Hold the governor control lever in the HIGH IDLE position. Rotate the governor shaft counterclockwise.

10. Insert 6V-7942 Hook (11) into the hole that is left from the removal of plug (9) .

    1. Engage the end of 6V-7942 Hook (11) with collar (12) .

    2. Pull these two components toward the rear of the governor housing until the collar stops moving.

       This ensures that the fuel rack stops against fuel pump timing pin (10). The rack will then be in zero rack position.

11. With hook (11) that is pulled toward the rear of the governor housing, loosen collet (2).

    1. Then, adjust the revolution counter on the dial indicator to zero.

    2. Tighten collet (2) enough to hold the indicator in this position.

    3. Move the indicator's dial to zero.

12. Remove 6V-4186 Fuel Pump Timing Pin (10) .

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Illustration 11	g00320183
6V-7941 Compressor Assembly (13) Rod. (14) Knob.

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Illustration 12	g00320203
Installed Compressor Assembly (15) 6V-7942 Compressor assembly.

13. Turn rod (13) out of 6V-7941 Compressor Assembly (15) until knob (14) is 25.4 mm (1.00 inch) from the compressor body. Install this assembly into the hole that is left from the removal of plug (9) .

    Note: The procedure for checking the fuel setting is different from the procedure for adjusting the fuel setting. Use Steps 14 through 17 to check the fuel setting. Use Steps 19 through 21 to adjust the fuel setting.

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Illustration 13	g00320505
Checking the Static Fuel Setting (16) 8T-0500 Continuity Tester. (17) Rack contact screw. (18) Adjustment screw cover.

14. Fasten the clip end of 8T-0500 Continuity Tester (16) to rack contact screw (17). Connect the other end to an electrical ground.

15. Hold the governor control lever in the FUEL-ON position. Fully rotate the governor control lever in a counterclockwise direction.

16. Turn rod (13) on 6V-7941 Compressor Assembly (15) clockwise until the light in the continuity tester (16) goes out.

    After the light goes out, the hands on the dial indicator will move for an additional 2 mm in the negative direction.

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NOTICE
Do not turn the rod any further inward if the rod begins to tighten. Damage to the governor can occur if the rod is turned further inward.

17. Slowly turn rod (13) counterclockwise until the circuit tester light just turns on. This is the static fuel setting.

    Note: See the TMI for more information on the correct static fuel setting.

    Note: There will be a small, initial amount of movement by the indicator hands. Then, the indicator hands will stop moving while the rod is turned out for another 1 1/2 turns. Now, the indicator hands will begin to move again. The indicator hands will follow the turning of the rod until the setting is reached. Remember to turn the rod slowly so the rack can follow the governor components.

18. If the static fuel setting is not correct, remove adjustment screw cover (18) from the rear of the governor housing.

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Illustration 14	g00320507
Adjustment Screw Cover after Removal (19) Fuel setting screw.

19. Determine the amount of change that is required for the static fuel setting. Use Table 2 for turning measurements. Also, review the following examples carefully.
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    Table 2

    Adjustment Screw Chart
    Amount of Change	Turns of Adjustment Screw
    3.0 mm (.118 inch)	3 3/4
    2.8 mm (.110 inch)	3 1/2
    2.6 mm (.102 inch)	3 1/4
    2.4 mm (.094 inch)	3
    2.2 mm (.087 inch)	2 3/4
    2.0 mm (.079 inch)	2 1/2
    1.8 mm (.071 inch)	2 1/4
    1.6 mm (.063 inch)	2
    1.4 mm (.055 inch)	1 3/4
    1.2 mm (.047 inch)	1 1/2
    1.0 mm (.039 inch)	1 1/4
    .08 mm (.031 inch)	1
    .06 mm ( .024 inch)	3/4
    .04 mm (.016 inch)	1/2
    .02 mm (.008 inch)	1/4

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    Table 3

    Example #1
    Actual Reading	(1.05 mm)
    Desired Reading	(1.25 mm)
    Difference	(0.20 mm)

    Since the desired setting is higher than the actual reading, turn the adjusting screw counterclockwise by approximately 1/4 of a turn. Recheck the new setting, and readjust the setting, if necessary.

    Please, review the remaining examples:

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    Table 4

    Example #2
    Actual Reading	(2.77 mm)
    Desired Reading	(1.85 mm)
    Difference	(0.92 mm)

    Since the desired setting is lower than the actual reading, turn the adjusting screw clockwise by approximately 1 1/8 of a turn. Recheck the new setting, and readjust the setting, if necessary.

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    Table 5

    Example #3
    Actual Reading	(-1.05 mm)
    Desired Reading	(-1.25 mm)
    Difference	(0.20 mm)

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

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    Table 6

    Example #4
    Actual Reading	(-2.77 mm)
    Desired Reading	(-1.85 mm)
    Difference	(0.92 mm)

    Since the desired setting is higher than the actual reading, turn the adjusting screw counterclockwise by approximately 1 1/8 of a turn. Recheck the new setting, and readjust the setting, if necessary.

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    Table 7

    Example #5
    Actual Reading	(+1.05mm)
    Desired Reading	(-1.25 mm)
    Difference	(2.30 mm)

    The desired setting is lower than the actual reading. Therefore, turn the adjusting screw clockwise by approximately 2 7/8 of a turn. Recheck the new setting, and readjust the setting, if necessary.

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    Table 8

    Example #6
    Actual Reading	(-1.05mm)
    Desired Reading	(+1.25 mm)
    Difference	(2.30 mm)

    The desired setting is higher than the actual reading. Turn the adjusting screw counterclockwise by approximately 2 7/8 of a turn. Recheck the new setting, and readjust the setting, if necessary.

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Illustration 15	g00320508
Adjusting the Fuel Setting (20) 6V-2105 Rack Adjustment Tool

20. Use 6V-2105 Rack Adjustment Tool (20) to loosen the locknut for the adjusting screw. Also use this tool group to turn the locknut.

21. Adjust the fuel setting screw by the number of turns that were determined in Step 19. Always recheck the fuel setting after you adjust the setting. Adjust the setting again, if necessary.