GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure

  1. Clean the oil filter adapter in solvent.
  2. Caution: Wear safety glasses in order to avoid eye damage.

  3. Dry the oil filter adapter with compressed air.

Inspection Procedure


    Object Number: 655223  Size: SH
  1. Inspect the oil filter adapter for the following:
  2. • Damage to the wiring harness retaining tab (2)
    • Damage to the threads for the oil pressure switch (3)
    • Damage to the threads for the bypass valve hole plug (4)
    • Damage to the mounting holes (1)

    Object Number: 655228  Size: SH
  3. Inspect the oil filter adapter for the following:
  4. • Damage to the oil filter bypass valve (2)
    • Damage to the mounting surface (3)
    • Damage to the O-ring sealing surface (4)
    • Damage to the threads for the oil filter fitting (5)
    • Damage to the oil filter sealing surface (1)
  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.