GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 4WD 🢒 Engine 🢒 Engine Electrical 🢒 Oil Filter Adapter and Bypass Valve Assembly Replacement

Removal Procedure

    Object Number: 188050 Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Position a suitable container to catch the engine oil.
  3. Remove the oil filter.
  4. Disconnect the engine oil cooler pipes from the oil filter adapter. Refer to Engine Oil Cooler Hose/Pipe Replacement in Engine Cooling.

    5. Object Number: 4554 Size: SH
  5. Remove the oil filter adapter bolts.

    6. Object Number: 4555 Size: SH
  6. Remove the oil filter adapter and the oil filter adapter gasket.
  7. Discard the oil filter adapter gasket.

    8. Object Number: 4556 Size: SH
  8. Remove the oil filter adapter seal (O-ring).
  9. Discard the oil filter adapter seal (O-ring).
  10. Clean all sealing surfaces.

    11. Object Number: 188026 Size: SH
  11. Remove the oil filter bypass valve.
  12. Clean and inspect valve bore for damage.

Installation Procedure

    Object Number: 188023 Size: SH

    Caution: Wear safety glasses in order to avoid eye damage.

  1. Install a NEW oil filter bypass valve.
    2. 1.1. Install the bypass valve into the oil gallery bore until slightly below flush with the surface of the engine block.
    1.2. Using a pointed punch, stake the engine block area around the oil filter bypass valve.

    Stake in three locations 120 degrees apart.


    Object Number: 4556 Size: SH
  2. Install a NEW seal (O-ring) into the groove in the oil filter adapter.

    3. Object Number: 4555 Size: SH
  3. Install the oil filter adapter with a NEW gasket.

    4. Object Number: 4554 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the oil filter adapter bolts.

    5. Tighten
    Tighten the oil filter adapter bolts to 21 N·m (15 lb ft).

  5. Connect the engine oil cooler pipes to the oil filter adapter. Refer to Engine Oil Cooler Hose/Pipe Replacement in Engine Cooling.

    6. Object Number: 188050 Size: SH
  6. Install the engine oil filter.
  7. Lower the vehicle.