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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Engine Mechanical - 3.8L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Oil Pan Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (L36)  or Fuel Injector Sight Shield Replacement (L67) .
  3. Remove the air cleaner intake duct. Refer to Air Cleaner Intake Duct Replacement In Engine Controls - 3.8L.
  4. Install the engine support fixture. Refer to Engine Support Fixture .
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
    6. Fig 1: View Of Catalytic Converter & Exhaust Manifold Pipe Stud Nuts
    GM372626Courtesy of GENERAL MOTORS CORP.
  6. Remove the right exhaust manifold pipe stud nuts from the catalytic converter.
  7. Drain the engine oil and remove the oil filter. Refer to Engine Oil and Oil Filter Replacement .
  8. Remove the power steering oil cooler pipe brackets from the frame.
  9. Disconnect the oil level sensor electrical connector.
  10. Remove the oil level sensor wiring harness bolt and reposition the oil level sensor wiring harness.
    11. Fig 2: Engine Mount Lower Nuts
    GM50411Courtesy of GENERAL MOTORS CORP.
  11. Remove the engine mount lower nuts from the engine mount.
  12. Lower the vehicle.
  13. Use the engine support fixture to raise the engine.
  14. Raise the vehicle.
    15. Fig 3: Left Engine Mount Bracket Bolts
    GM97800Courtesy of GENERAL MOTORS CORP.
  15. Remove the left engine mount bracket bolts from the engine.
    16. Fig 4: Right Engine Mount Bracket Bolts
    GM97804Courtesy of GENERAL MOTORS CORP.
  16. Remove the right engine mount bracket bolts from the engine.
  17. Remove the right stabilizer link. Refer to Stabilizer Shaft Link Replacement in Front Suspension.
  18. Remove the right ball joint from the steering knuckle. Refer to Lower Control Arm Replacement in Front Suspension.
  19. Support the frame with jack stands.
  20. Remove the right side frame bolts and loosen the left side frame bolts 5 turns. Refer to Frame Replacement in Frame and Underbody.
  21. Using the jack stands lower the frame.
  22. Remove the engine mount and the bracket from the frame.
  23. Remove the torque converter covers. Refer to Torque Converter Cover Replacement in Automatic Transaxle - 4T65 - E.
    24. NOTE: Remove the oil level sensor, located in the oil pan, before the oil pan is removed. The sensor may be damaged if the oil pan is removed first.
    Fig 5: Oil Level Sensor
    GM97768Courtesy of GENERAL MOTORS CORP.
  24. Remove the oil level sensor.
    25. Fig 6: Oil Pan & Bolt
    GM97771Courtesy of GENERAL MOTORS CORP.
  25. Remove the oil pan bolts.
  26. Remove the oil pan.
    27. Fig 7: Oil Pump Pipe Screen Assembly & Oil Pan Gasket
    GM97769Courtesy of GENERAL MOTORS CORP.
  27. Remove the oil pump pipe screen assembly and the oil pan gasket.
  28. Clean the following parts:
    • Oil pump screen mating surfaces
    • Oil pan flanges
    • Oil pan rail
    • Front cover
    • Rear main bearing cap
    • Threaded holes
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