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Diesel Engine Only

Engine is properly timed when marks on top of injection pump adapter and pump flange are aligned. If marks are not aligned, adjustment is necessary. Engine must be off.

  1. Loosen 3 pump retaining nuts with wrench (J-26987).
  2. Align mark on pump with mark on adapter and tighten nuts. If necessary, use a 3/4" wrench on boss at front of injection pump to aid in rotating pump to align marks. Torque to 35 ft. lbs.
  3. Adjust throttle rod. See LINKAGE ADJUSTMENT in see General Motors Diesel Fuel Injection article in FUEL SYSTEMS section.
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