K 3500 Truck 4WD V8-66L DSL Turbo VIN 1 (2001) Engine Lubrication: Oil Pan Replacement (Lower)
9. Remove the engine flywheel housing to upper oil pan bolts denoted by the black triangles.
10. Remove the upper oil pan bolts and any brackets. Mark the bolt location of the bracket.
11. Separate the upper oil pan from the engine block.
12. Remove the upper oil pan. The oil level indicator tube needs to be removed while lowering the upper oil pan.
13. Clean the upper oil pan.
14. Clean the sealing surface on the engine block.
15. Inspect the upper oil pan for cracks.
16. Inspect the upper oil pan sealing surfaces and the engine block for damage.
Installation Procedure
1. Apply a 2 mm (1/8 inch) wide bead of sealant GM P/N 12378521 or equivalent to the upper oil pan mating surfaces.
2. Apply a 2 mm (1/8 inch) wide bead of sealant GM P/N 12378521 or equivalent to engine flywheel housing sealing surface.
