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Home >> GMC >> 1990 >> Forward Control 7.4 N, Automatic, 400/M40 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Injection Pump Timing (Diesel) >> 6.2L (VIN C & J)

6.2L (VIN C & J)

  1. Original factory injection pump timing is marked with a static timing mark (straight line scribed across both the pump flange and front housing). Injection pump timing is dynamically checked and marked with a dynamic timing mark (a circle scribed across both the pump flange and the front housing).
  2. To properly time engine, the 2 halves of the dynamic timing mark (circle between pump flange and front housing) must be aligned. Engine must be off while timing is being set. Service pump is not marked with dynamic timing mark (circle) and should be timed using static timing mark.
  3. Check alignment of injection pump timing marks on top of engine front cover and injection pump flange. If timing marks are not aligned, loosen 3 retaining nuts and align mark on injection pump with mark on front cover. Tighten nuts to 30 ft. lbs. (41 N.m). Adjust throttle linkage.
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