GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Engine 🢒 Engine Mechanical - 4.6L 🢒 Oil Pump Cleaning and Inspection

Cleaning Procedure

    Object Number: 71393 Size: SH
  1. Clean the oil pump components (1-8) with non-corrosive solvent.

    2. Warning: Refer to Safety Glasses Warning in the Preface section.

  2. Dry the oil pump components with compressed air.

Inspection Procedure

    Object Number: 71393 Size: SH

    Note: 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.