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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical 6.5L Turbo Diesel - VIN [F] >> Adjustments >> Injection Pump Timing Adjustment >> Preliminary Information (Timing Marks)

Preliminary Information (Timing Marks)

Look for timing marks where injection pump flange mates with engine front cover. At the factory, a static timing mark (straight line) and a dynamic timing mark (oval) are scribed in this area.

Replacement pumps do not have a dynamic timing mark on them. Some replacement pumps have a static timing mark. If replacement pump has a static timing mark on it, align static marks during installation. If replacement pump does not have a static timing mark on it, scribe one on it (you will need it for movement reference during adjustment procedure).