GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Yukon - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Oil Pump Cleaning and Inspection

    Important: 

       • The internal parts of the oil pump assembly are not serviced separately, excluding the spring. If the oil pump components are worn or damaged, replace the oil pump as an assembly.
       • The oil pump pipe and screen are to be serviced as an assembly. Do not attempt to repair the wire mesh portion of the pump and screen assembly.

  1. Clean the parts in solvent.

    2. Caution: Wear safety glasses in order to avoid eye damage.

  2. Dry the parts with compressed air.

    3. Object Number: 65060 Size: SH
  3. Inspect the oil pump housing and the cover for cracks, excessive wear, scoring, or casting imperfections.
  4. Inspect the oil pump housing-to-engine block oil gallery surface for scratches or gouging.
  5. Inspect the oil pump housing for damaged bolt hole threads.

    6. Object Number: 65064 Size: SH
  6. Inspect the relief valve plug and plug bore for damaged threads.
  7. Inspect the oil pump internal oil passages for restrictions.

    8. Object Number: 65060 Size: SH
  8. Inspect the drive gear and driven gear for chipping, galling or wear.

    9. Minor burrs or imperfections on the gears may be removed with a fine oil stone.


    Object Number: 65058 Size: SH
  9. Inspect the drive gear splines for excessive wear.

    10. Object Number: 65076 Size: SH
  10. Inspect the pressure relief valve and bore for scoring or wear.

    11. The valve must move freely in the bore with no restrictions.


    Object Number: 64268 Size: SH
  11. Inspect the oil pump screen for debris or restrictions.
  12. Inspect the oil pump screen for broken or loose wire mesh.