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Home >> Buick >> 2005 >> Century Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle - Introduction & Repair Instructions >> Repair Instructions >> Oil Pan Replacement >> Removal Procedure

Removal Procedure

    Fig 1: View Of Transaxle Oil Pan And Gasket
    GM164804Courtesy of GENERAL MOTORS CORP.
    NOTE: Do NOT use any type of grease to retain parts during the assembly of this unit. Using greases other than the recommended assembly lube changes the transaxle fluid characteristics. Using greases other than the recommended assembly lube causes undesirable shift conditions and/or filter clogging. Use TRANSJEL™ J 36850 or equivalent during the assembly of this unit.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Place a drain pan under the transaxle oil pan.
  3. Remove the transaxle oil pan bolts (23) from the front and the sides of the oil pan.
  4. Loosen the rear transaxle oil pan bolts.
    5. NOTE: Ensure care is taken NOT to damage the mating surfaces of the oil pan and of the case or oil leaks may occur.
  5. Use a rubber mallet to lightly tap the oil pan or use a screwdriver to pry the oil pan loose.
  6. Allow the fluid to drain.
  7. Remove the remaining transaxle bolts (23).
  8. Remove the oil pan (24) from the automatic transmission.
  9. Remove the oil pan gasket (25).
  10. Inspect the oil pan and the filter for the following foreign material:
    • Metal particles
    • Clutch facing material
    • Rubber particles
    • Engine coolant
  11. Determine the source of the contamination.
  12. Correct the source of the contamination.
    13. Fig 2: Inspecting Oil Pan Flange
    GM164780Courtesy of GENERAL MOTORS CORP.
  13. Inspect the oil pan flange (1) for distortion.
  14. Replace the oil pan (1) if bent or distorted. Do not attempt to straighten.
    15. Fig 3: View Of Oil Pan Bolt
    GM164805Courtesy of GENERAL MOTORS CORP.
  15. When service requires the removal of the bottom oil, inspect the washers on the oil pan bolts.
    16. Fig 4: Identifying Inverted Oil Pan Washer
    GM164806Courtesy of GENERAL MOTORS CORP.
  16. If the washer is inverted, replace the bolt and the washer.
    17. NOTE: Ensure the oil pan and the case flanges are dry and are free of any oil film or leakage may result.
  17. Use solvent to clean the case.
  18. Air dry the case.
  19. Use solvent to clean the oil pan gasket surfaces.
  20. Air dry the oil pan gasket surfaces.
  21. Remove all traces of the old gasket material.
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