Remove rear timing gear cover. Disconnect cold start device by loosening screw "1", pushing lever forward and rotating it 90°. DO NOT touch screw "2". See Fig 1 . If it is loosened, cold start device must be reset on a test bench.

Fig 1: Cold Start Device Connections DO NOT touch screw "2"
Set cylinder No. 1 at TDC on compression stroke. Both cam lobes should point up at equally large angles. Flywheel timing mark should be at "0". See Figure .
Remove inspection plug from injection pump cover. Install dial indicator holder (5194) and a 0-.12" (0-3 mm) dial indicator gauge.
Preset indicator to approximately .08" (2 mm). Turn engine counterclockwise until indicator gauge is at minimum. Set gauge to zero.

Fig 2: Fuel Injection Pump Timing

Turn engine clockwise until flywheel "0" mark aligns with arrow. Indicator gauge should now read within specifications. If not, loosen injector pump bolts and rotate pump to change setting. Repeat steps 4) and 5).

INJECTION PUMP PLUNGER LIFT

Application

In. (mm)

760 GLE with EGR ⁽¹⁾

Checking

.0288-.0320 (.72-.80)

Adjusting

.0300 (.75)

760 GLE ⁽¹⁾

Checking

.0323-.0354 (.82-.90)

Adjusting

.0335 (.85)

Checking

.0323-.0354 (.82-.90)

Adjusting

.0335 (.85)

⁽¹⁾	For high altitude operation, advance injection timing .0028" (.07 mm) for every 3300 ft. increase in altitude.

When checking pump timing, if engine is turned too far past "0" mark, it must be turned back approximately 1/4 turn and then clockwise again to "0" or settings will be incorrect.
CAUTION: If adjusting allowances are insufficient, do not tap or knock injection pump to change setting. It may be camshaft is not in proper relationship to crankshaft and/or front or rear drive belts may be improperly tensioned. Check and correct this condition and then set injection timing.
After adjusting injection pump setting, turn engine twice and recheck setting. Readjust as necessary. Remove dial indicator and holder. Install rear timing gear cover.
Connect cold start device. DO NOT turn screw "2". Push lever forward and turn sleeve 90°. Tighten screw "1".

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Fuel Injection Pump Timing

Use the Manual With the Right Hardware

When to See a Mechanic