GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure


    Object Number: 256675  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: 256675  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. Inspect the housing (1) and the cover (7) for cracks, scoring, casting imperfections, and damaged threads.
  2. Inspect the gerotor gears (5, 6) for chipping, galling or excessive wear.
  3. Inspect the pressure relief valve components (2-4) for embedded particles and/or damage.