Chevrolet Silverado / GMC Sierra. Service manual — part 170

3. Apply clean engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent, to the oil

pump drive gear, the oil pump driven gear, and the oil pump body internal surfaces.

4. Install the oil pump drive gear and the oil pump driven gear into the oil pump body.

1. Align the matchmarks on the oil pump drive and driven gears.

2. Install the smooth side of the oil pump drive and driven gears toward the oil pump

cover.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 566: View Of Oil Pump Cover
Courtesy of GENERAL MOTORS CORP.

5. Install the oil pump cover.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 567: View Of Oil Pump Cover Bolts
Courtesy of GENERAL MOTORS CORP.

6. Install the oil pump cover bolts.

Tighten: Tighten the bolts to 12 N.m (106 lb in).

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

7. Inspect the oil pump for smoothness of operation by turning the oil pump driveshaft by

hand.

Fig. 568: Installing Oil Pump Screen Into Pump Body
Courtesy of GENERAL MOTORS CORP.

8. Install the oil pump screen.

1. If removed, replace the oil pump screen. The oil pump screen must have a good press

fit into the oil pump body.

2. Mount the oil pump in a soft jawed vise.

3. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the end

of the oil pump screen pipe.

4. Use the J 21882 and a soft-faced hammer in order to tap the oil pump screen into the

pump body. See Special Tools.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado