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Oil Pump Cleaning and Inspection

WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clean all of the parts in cleaning solvent. Dry the parts with compressed air.
  2. Inspect the following areas:
    • The oil pump housing and cover for cracks, scoring (3), casting imperfections, and damaged threads.
    • The drive gear shaft (5). If the shaft is loose in the oil pump housing, replace the oil pump.
    • The pressure relief valve for scoring and sticking. Burrs may be removed with a fine oil stone.
    • The relief valve spring for loss of tension.
    • The oil pump screen for broken wire mesh or looseness. If the pipe is loose or has been removed from the screen, the oil pump screen must be replaced.
    • The gears for chipping, galling, and wear (1,2).

      Important:  If the drive gear and driveshaft are worn, replace the entire oil pump.

    • The drive gear and driveshaft for looseness and wear.
Fig 1: Inspecting Oil Pump Components
G01660826Courtesy of GENERAL MOTORS CORP.
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