GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2003 🢒 H2 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Oil Pan Replacement

Removal Procedure
  1. Remove the front differential. Refer to Differential Carrier Assembly Replacement .
  2. Remove the starter motor. Refer to Starter Motor Replacement .

    3. Object Number: 328107 Size: SH
  3. Remove the crossbar bolts.
  4. Remove the crossbar.

    5. Object Number: 178477 Size: SH
  5. Remove the transmission cover bolt and cover.
  6. Drain the engine oil and remove the engine oil filter.
  7. Re-install the drain plug and oil filter until snug.

    8. Object Number: 394448 Size: SH
  8. Remove the transmission bolt and stud on the right side.

    9. Object Number: 394446 Size: SH
  9. Remove the bottom bolt on the left side.

    10. Object Number: 662991 Size: SH
  10. Disconnect the oil level sensor electrical connector (6).

    11. Object Number: 662508 Size: SH
  11. Remove the battery cable channel bolt.
  12. Slide the channel pin out of the oil pan tab.

    13. Object Number: 662510 Size: SH
  13. Remove the following from the positive battery cable clip:
    14. • Engine wiring harness clip
    • Positive battery cable clip

    Object Number: 310672 Size: SH
  14. Remove the engine oil cooler lines from the positive battery cable clip.
  15. Remove the positive battery cable clip bolt and clip.

    16. Object Number: 683355 Size: SH
  16. Remove the oil pan bolts.
  17. Remove the oil pan.

    18. Object Number: 384699 Size: SH

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

  18. Drill (3) out the oil pan gasket retaining rivets (2), if required.
  19. Remove the gasket (1) from the pan.
  20. Discard the gasket and rivets.
  21. Clean and inspect the engine oil pan. Refer to Oil Pan Cleaning and Inspection .

Installation Procedure

Important: 

   • The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the transmission bellhousing. 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 must NEVER protrude beyond the engine block and transmission bellhousing plane.
   • Do not reuse the oil pan gasket.
   • It is not necessary to rivet the NEW gasket to the oil pan.


    Object Number: 451897 Size: SH
  1. Apply a 5 mm (0.20 in) bead of sealant 20 mm (0.80 in) long to the engine block. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

    2. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil pan surface.


    Object Number: 451898 Size: SH
  2. Apply a 5 mm (0.20 in) bead of sealant 20 mm (0.8 in) long to the engine block. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.

    3. Apply the sealant directly onto the tabs of the rear cover gasket that protrudes into the oil pan surface.


    Object Number: 683355 Size: SH

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

  3. Pre-assemble the oil pan gasket to the pan.
    4. • Install the gasket onto the pan.
    • Install the oil pan bolts to the pan and through the gasket.
  4. Install the oil pan, gasket and bolts to the engine block.
  5. Tighten the oil pan bolts until snug. Do not overtighten.

    6. Object Number: 394448 Size: SH
  6. Install the transmission bolt and stud on the right side until snug.

    7. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 394446 Size: SH
  7. Install the bottom bolt on the left side until snug.

    8. Tighten

    1. Tighten the oil pan and oil pan-to-oil pan front cover bolts to 25 N·m (18 lb ft).
    2. Tighten the oil pan-to-rear cover bolts to 12 N·m (106 lb in).
    3. Tighten the bellhousing, converter cover, and transmission bolts/stud to 50 N·m (37 lb ft).

    Object Number: 310672 Size: SH
  8. Install the positive battery cable clip and bolt to the oil pan.

    9. Tighten
    Tighten the positive battery cable clip bolt to 9 N·m (80 lb in).

  9. Install the engine oil cooler lines to the positive battery cable clip.

    10. Object Number: 662510 Size: SH
  10. Install the following to the positive battery cable clip:
    11. • Engine wiring harness clip
    • Positive battery cable clip

    Object Number: 662508 Size: SH
  11. Slide the channel pin in to the oil pan tab.
  12. Install the battery cable channel bolt.

    13. Tighten
    Tighten the battery cable channel bolt to 12 N·m (106 lb in).


    Object Number: 662991 Size: SH
  13. Connect the oil level sensor electrical connector (6).

    14. Object Number: 178477 Size: SH
  14. Install the transmission cover and bolt.

    15. Tighten
    Tighten the transmission cover bolt to 12 N·m (106 lb in).


    Object Number: 328107 Size: SH
  15. Install the crossbar.
  16. Install the crossbar bolts.

    17. Tighten
    Tighten the crossbar bolts to 100 N·m (74 lb ft).

  17. Install the starter motor. Refer to Starter Motor Replacement .
  18. Install the front differential. Refer to Differential Carrier Assembly Replacement .
  19. Install new engine oil and a new oil filter. Refer to Engine Oil and Oil Filter Replacement .