Chevrolet Silverado / GMC Sierra. Manual — part 373

1. Clean the parts in solvent.

2. Dry the parts with compressed air.

3. Inspect the oil pump housing (413) and the cover (409) for cracks, excessive wear, scoring,

or casting imperfections.

4. Inspect the oil pump housing-to-engine block oil gallery surface for scratches or gouging.

5. Inspect the oil pump housing for damaged bolt hole threads.

6. Inspect the relief valve plug (416) and plug bore for damaged threads.

7. Inspect the oil pump internal oil passages for restrictions.

8. Inspect the drive gear (410) and driven gear (412) for chipping, galling, or wear.

Minor burrs or imperfections on the gears may be removed with a fine oil stone.

9. Inspect the drive gear splines for excessive wear.

10. Inspect the pressure relief valve (414) and bore for scoring or wear.

The valve must move freely in the bore, with no restrictions.

CAUTION: Refer to Safety Glasses Caution .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 492: View Of Oil Pump Screen, Bolt, Nuts, & O-Ring Seal
Courtesy of GENERAL MOTORS CORP.

11. Inspect the oil pump screen (407) for debris or restrictions.

12. Inspect the oil pump screen for broken or loose wire mesh.

OIL PUMP ASSEMBLE

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 493: Exploded View Of Oil Pump
Courtesy of GENERAL MOTORS CORP.

1. Install the driven gear (412) into the pump housing (413).

Install the driven gear with the orientation mark facing the pump cover.

2. Install the drive gear (410) into the pump housing.

3. Install the oil pump cover (409).

4. Install the oil pump cover bolts (408).

IMPORTANT: Prior to assembling the oil pump, coat all wear or internal

surfaces with clean engine oil.

NOTE:

Refer to Fastener Notice .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2