Chevrolet Silverado / GMC Sierra. Manual - part 169
Fig. 563: Oil Pump Components
Courtesy of GENERAL MOTORS CORP.
CAUTION: Refer to SAFETY GLASSES CAUTION .
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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