Chevrolet Silverado / GMC Sierra. Manual — part 169

1. Clean the oil pump components in cleaning solvent.

2. Dry the components with compressed air.

3. Inspect the oil pump for the following conditions:

Scoring on the top of the gears (1)

Damaged gears (2) for the following:

Chipping

Galling

Wear

Scoring, damage or casting imperfections to the body (3)

Damaged or scored gear shaft (4)

Damaged or scored gear shaft (5)

Damaged bolt hole threads

Worn oil pump driveshaft bore

Damaged or sticking oil pump pressure relief valve

Minor imperfections may be removed with a fine oil stone.

Collapsed or broken oil pump pressure relief valve spring

4. If the oil pump is to be reused, install a NEW oil pump pressure relief valve spring.

5. During oil pump installation, install a NEW oil pump driveshaft retainer.

OIL PUMP ASSEMBLE

Tools Required

J 21882 Oil Suction Pipe Installer. See Special Tools.

Assemble

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 564: View Of Oil Pump Pressure Relief Valve, Spring & Spring Straight Pin
Courtesy of GENERAL MOTORS CORP.

1. Apply clean engine oil GM P/N 12345610 (Canadian P/N 9931930) or equivalent, to the

oil pump pressure relief valve, oil pump pressure relief valve spring, and oil pump body.

2. Install the following items:

1. The oil pump pressure relief valve

CAUTION: Refer to SAFETY GLASSES CAUTION .

IMPORTANT: Replace the oil pump pressure relief valve spring when you

reuse the oil pump.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

2. The oil pump pressure relief valve spring

3. The oil pump pressure relief valve spring straight pin

Fig. 565: View Of Oil Pump Drive Gear & Driven Gear
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado