GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure


    Object Number: 71393  Size: SH
  1. Clean the oil pump components (1-8) with non-corrosive solvent.
  2. Caution: Wear safety glasses in order to avoid eye damage.

  3. Dry the oil pump components with compressed air.

Inspection Procedure


    Object Number: 71393  Size: SH

    Important: The internal parts of the oil pump are not serviced separately. If wear or damage is noted, replace the entire pump assembly.

  1. Clean the oil pump components with non-corrosive solvent.
  2. Inspect the housing (1) and the cover (6) for cracks, scoring, casting imperfections and damaged threads.
  3. Inspect the gerotor gears (5) for chipping, galling or wear.
  4. Inspect the pressure relief valve (2) for embedded particles and/or damage.