GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2003 🢒 Regal 🢒 General Information 🢒 General Information 🢒 Oil Filter Adapter and Bypass Valve Assembly Replacement

Removal Procedure
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the right side wheel drive shaft. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
  4. Disconnect the oil pressure sensor electrical connector.

    5. Object Number: 153591 Size: SH
  5. Remove the oil filter and drain the engine oil. Refer to Engine Oil and Oil Filter Replacement .

    6. Object Number: 406042 Size: SH
  6. Remove the four bolts holding the oil filter adapter to the engine front cover.
  7. Remove the following components:
    8. • Oil filter adapter
    • Gasket
    • Oil pressure valve and spring
  8. Clean the parts in a suitable solvent. Dry the parts.
  9. Clean the oil filter adapter gasket mating surfaces.
  10. Inspect the following areas:
    11. • The oil pressure valve and the valve bore for burrs
    • The spring for loss of tension. Replace the spring if necessary.

    Object Number: 406041 Size: SH
  11. If replacing the oil filter adapter and valve assembly, remove the engine oil pressure sensor from the oil filter adapter and valve assembly.

Installation Procedure

    Object Number: 406041 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.

  1. If replacing the oil filter adapter and valve assembly, install the engine oil pressure sensor to the oil filter adapter and valve assembly.

    2. Tighten
    Tighten the engine oil pressure sensor to 16 N·m (12 lb ft).


    Object Number: 406042 Size: SH
  2. Install the spring into the engine front cover.
  3. Install the oil pressure valve into the engine front cover.
  4. Install the oil filter adapter and a new gasket.
  5. Install the oil filter adapter attaching bolts.

    6. Tighten
    Tighten the oil filter adapter bolts to 15 N·m (11 lb ft + 50 degrees).


    Object Number: 153591 Size: SH
  6. Install the engine oil filter and the engine oil drain plug. Refer to Engine Oil and Oil Filter Replacement .
  7. Connect the oil pressure sensor electrical connector.
  8. Install the right side wheel drive shaft. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
  9. Lower the vehicle.
  10. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  11. Fill the crankcase with engine oil. Refer to Engine Oil and Oil Filter Replacement .
  12. Inspect for proper oil pressure.
  13. Inspect for leaks.