GM Service Manual Online
For 1990-2009 cars only

Oil Filter Adapter Cleaning and Inspection without Oil Cooler

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.

Oil Filter Adapter Cleaning and Inspection with Oil Cooler

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: 655231  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 following:
       - Oil pressure switch (3)
       - Oil cooler line connector fittings (4)
       - Oil cooler bypass valve (5)
    • Damage to the mounting holes (1)

    Object Number: 655233  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.