Oil Pan Installation for GMC Truck TopKick C-Series (Conventional) C4/C5 2003

Important: The oil pan must be installed within five minutes of the sealer being applied or the sealer will begin to cure, causing an inadequate seal.

1. Apply sealant GM P/N United States 12346141, GM P/N Canada 10953433, to the side of the front cover (1) and rear (2) crankshaft bearing cap, on both the left and right sides, 4 locations total.



2. Install the new oil pan gasket (2) into the oil pan groove.
3. Install the oil pan (1).



4. Install the oil pan bolts.

Notice: Refer to Fastener Notice in the Preface section.

5. Tighten the oil pan bolts in sequence.

Tighten

•	Tighten the oil pan bolts in sequence to 10 N·m (89 lb in) in a first pass.

•	Tighten the oil pan bolts in sequence to 25 N·m (18 lb ft) in a second pass.




6. Install the oil pan drain plug.

Tighten
Tighten the oil pan drain plug to 28 N·m (21 lb ft).

7. Lubricate the oil level sensor O-ring with engine oil.



8. Install the oil level switch.

Tighten
Tighten the oil level switch to 20 N·m (15 lb ft).