GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure

  1. Clean the oil pump components with non-corrosive solvent.
  2. Warning: Refer to Safety Glasses and Compressed Air Warning in the Preface section.

  3. Dry the oil pump components with compressed air.

Visual Inspection


    Object Number: 2028102  Size: SH
  1. Inspect the oil pump housing for the following:
  2. • Damage, scoring, or debris on the housing surface for the drive gear (1)
    • Damage, scoring, or debris in the oil pump relief valve bore (2)
    • Damage to the oil pump housing mounting points (3)
    • Damage to the threads in the oil pump housing for the oil pump cover bolts (4)
    • Damage, scoring, or debris on the housing surface (5)
    • Damage, scoring, or debris in the oil pump output port  (6)

    Object Number: 2028103  Size: SH
  3. Inspect the oil pump for the following conditions:
  4. • Damage to the oil pump cover mounting points (1)
    • Damage to the oil pump oil pump drive shaft gear (2)
    • Damage to the sealing surface between the oil pump and the oil pump housing (3)
    • Damage to the oil pump outer rotor (4)
    • Damage to the oil pump inner rotor (5)