Mechanics

GMC C2500 OIL PUMP PROBLEM

2005 GMC C2500 • 12,000 miles

How to change oil pump on this truck. Its a 2500 hd 6.0 4wheel drive. Just in simple detail. The oil pump is on the front of the motor, does the oil pan have to come off?
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January 4, 2013.



Oil Pump, Pump Screen and Deflector Replacement

Removal Procedure

Remove the oil pan.
Remove the engine front cover.
Remove the oil pump screen bolt and nuts.
Remove the oil pump screen with O-ring seal.
Remove the O-ring seal from the pump screen.
Discard the O-ring seal.

Remove the remaining crankshaft oil deflector nuts.
Remove the crankshaft oil deflector.

Remove the oil pump bolts.

Important: Do not allow dirt or debris to enter the oil pump assembly, cap end as necessary.

Remove the oil pump.
If required, clean and inspect the oil pump.

Installation Procedure

Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump.
Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine block.

Notice: Refer to Fastener Notice in Service Precautions.

Install the oil pump bolts. Tighten the bolts to 25 Nm (18 ft. Lbs.).

Install the crankshaft oil deflector and nuts until snug.

Lubricate a NEW oil pump screen O-ring seal with clean engine oil.
Install the NEW O-ring seal onto the oil pump screen.

Important: Push the oil pump screen tube completely into the oil pump prior to tightening the bolt. Do not allow the bolt to pull the tube into the pump.

Align the oil pump screen mounting brackets with the correct crankshaft bearing cap studs.

Install the oil pump screen.
Install the oil pump screen bolt and nuts.

Tighten the bolt to 12 Nm (106 inch lbs.).
Tighten the nuts to 25 Nm (18 ft. Lbs.).

Install the engine front cover.
Install the oil pan.