GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 LaCrosse 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Oil Pan Replacement

Removal Procedure

    Object Number: 1655027 Size: SH
  1. Remove the engine frame. Refer to Frame Replacement.
  2. Drain the engine oil and remove the engine oil filter.
  3. Reinstall the drain plug and oil filter until snug.
  4. Remove the transaxle converter cover bolt/stud and cover.

    5. Object Number: 1551872 Size: SH
  5. Disconnect the oil level sensor electrical connector.
  6. Remove engine harness retainer from the front of oil pan.

    7. Object Number: 1551874 Size: SH
  7. Position the drive belt tensioner aside in order to access the oil pan bolt. Refer to Drive Belt Tensioner Replacement - Accessory.
  8. Remove the oil pan bolts.
  9. Remove the oil pan.

    10. Object Number: 384699 Size: SH

    Note: DO NOT allow foreign material to enter the oil passages of the oil pan, cap or cover the openings as required.

  10. Drill (3) out the oil pan gasket retaining rivets (2), if required.
  11. Remove the gasket (1) from the pan.
  12. Discard the gasket and rivets.
  13. Clean and inspect the engine oil pan. Refer to Oil Pan Cleaning and Inspection.

Installation Procedure

Note: 

   • The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the transmission housing. To ensure the rigidity of the powertrain and correct transmission alignment, it is important that the rear of the block and the rear of the oil pan are flush, or even. The rear of the oil pan must NEVER protrude beyond the engine block and transmission housing plane.
   • Do NOT reuse the oil pan gasket.
   • It is NOT necessary to rivet the NEW gasket to the oil pan.


    Object Number: 1551873 Size: SH
  1. Apply a 5 mm (0.20 in) bead of sealant , or equivalent 20 mm (0.80 in) long to the engine block. Apply the sealant directly onto the tabs of the front/rear cover gasket that protrudes into the oil pan surface. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

    2. Object Number: 1551874 Size: SH

    Note: Be sure to align the oil gallery passages in the oil pan and engine block properly with the oil pan gasket.

  2. Pre-assemble the oil pan gasket to the pan.
    3. 2.1. Install the gasket onto the pan.
    2.2. Install the oil pan bolts to the pan and through the gasket.

    Caution: Refer to Fastener Caution in the Preface section.

  3. Install the oil pan, gasket, and bolts to the engine block.

    4. Tighten

        • Tighten the oil pan and oil pan-to-front cover bolts to 25 N·m (18 lb ft).
        • Tighten the oil pan-to-rear cover bolts to 12 N·m (106 lb in).
        • Tighten the transmission housing, converter cover, and transmission bolts/stud to 50 N·m (37 lb ft).
  4. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Accessory.

    5. Object Number: 1551872 Size: SH
  5. Install engine harness to front of oil pan.
  6. Connect the oil level sensor electrical connector.

    7. Object Number: 1655027 Size: SH
  7. Install the transaxle converter cover and bolt/stud.

    8. Tighten
    Tighten the bolt/stud to 12 N·m (106 lb in).

  8. Install new engine oil and a new oil filter. Refer to Engine Oil and Oil Filter Replacement.
  9. Install the engine frame. Refer to Frame Replacement.