GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Skylark 🢒 Engine 🢒 Engine Controls - 3.1L 🢒 Oil Pan Replacement

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Remove the drive belt. Refer to Drive Belt Replacement .

    3. Object Number: 63663 Size: SH
  3. Loosen the upper A/C compressor bolts, if equipped. Do not remove the bolts.
  4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Drain the crankcase.
  6. Remove the right front tire and wheel assembly. Refer to Wheel Removal in Tires and Wheels.
  7. Remove the right splash shield.
  8. Remove the engine mount strut from the suspension support. Refer to Engine Mount Strut Replacement .
  9. Remove the right front ABS wheel speed sensor harness from the right suspension support.
  10. Remove the right front ball joint. Refer to Lower Control Arm Ball Joint Replacement in Front Suspension.
  11. Remove the right side stabilizer link. Refer to Stabilizer Shaft Link Replacement in Front Suspension.
  12. Remove the right side suspension support. Refer to Front Suspension Crossmember Replacement in Front Suspension.

    13. Object Number: 63664 Size: SH
  13. Remove the lower A/C compressor bolts.
  14. Position the compressor aside. Support the compressor. Refer to Air Conditioning Compressor Replacement in HVAC System - Manual.
  15. Remove the engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement .
  16. Remove the engine to transmission brace. Refer to Transmission Mount Replacement in Automatic Transaxle - 4T60 - E.
  17. Remove the oil filter.
  18. Remove the starter. Refer to Starter Motor Replacement in Engine Electrical.
  19. Remove the flywheel inspection cover.

    20. Object Number: 54394 Size: SH
  20. Remove the oil pan side bolts.
  21. Remove the oil pan bolts.
  22. Remove the oil pan.
  23. Remove the oil pan gasket.
  24. Clean the following items:
    25. • Oil pan flanges
    • Oil pan rail
    • Front cover
    • Rear main bearing cap
    • Threaded holes

Installation Procedure

    Object Number: 61840 Size: SH
  1. Apply sealer GM P/N 1234579 or equivalent to both sides of the crankshaft rear main bearing cap. Press the sealer into the gap using a puddy knife or its equivalent.
  2. Install a new oil pan gasket.
  3. Install oil pan.

    4. 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 pan bolts.

    5. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  5. Install the oil pan side bolts.

    6. Tighten
    Tighten the side bolts to 50 N·m (37 lb ft).

  6. Install the transmission converter cover.
  7. Install the starter. Refer to Starter Motor Replacement in Engine Electrical.
  8. Install the oil filter.
  9. Install the engine to transmission brace. Refer to Transmission Mount Replacement in Automatic Transmission.
  10. Install the engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement .

    11. Object Number: 63663 Size: SH
  11. Loosely assemble the A/C compressor spacer and the upper bolts. Secure the spacer and the bolts in place.
  12. Install the A/C compressor to the engine. Refer to Air Conditioning Compressor Replacement in HVAC System - Manual.
  13. Install the right side suspension support. Refer to Front Suspension Crossmember Replacement in Front Suspension.
  14. Install the right side stabilizer bar. Refer to Stabilizer Shaft Link Replacement in Front Suspension.
  15. Install the right side ball joint. Refer to Lower Control Arm Ball Joint Replacement in Front Suspension.
  16. Connect the right front ABS wheel speed sensor harness.
  17. Install the engine mount strut to the suspension support. Refer to Engine Mount Strut Replacement .
  18. Install the right splash shield.
  19. Install the right front tire and wheel assembly. Refer to Wheel Installation in Tires and Wheels.
  20. Lower the vehicle.
  21. Install the drive belt. Refer to Drive Belt Replacement .
  22. Fill the crankcase.
  23. Connect the negative battery cable.