GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure

  1. Clean the oil filter adapter in solvent.
  2. Caution: Refer to Safety Glasses Caution in the Preface section.

  3. Dry the oil filter adapter with compressed air.

Inspection Procedure


    Object Number: 1040290  Size: SH
  1. Inspect the oil filter adapter for the following:
  2. • Damage to the threads for the oil pressure switch (2)
    • Damage to the threads for the bypass valve hole plug (3)
    • Damage to the mounting holes (1)

    Object Number: 1040400  Size: SH
  3. Inspect the oil filter adapter for the following:
  4. • Damage to the oil filter bypass valve (2)
    • Damage to the gasket sealing surface (1)
    • Damage to the threads for the oil filter fitting (4)
    • Damage to the oil filter sealing surface (3)
  5. Inspect the passages of the oil filter adapter for blockage or obstructions.
  6. Important: The oil filter bypass valve is not a replaceable component, the oil filter adapter must be replaced if the oil filter bypass valve requires replacement.

  7. Repair or replace components as necessary.