Hummer H2. Manual — part 1834

Fig. 506: Oil Pump Drive Gear
Courtesy of GENERAL MOTORS CORP.

9. Inspect the drive gear splines for excessive wear.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 507: Oil Pump Pressure Relief Valve
Courtesy of GENERAL MOTORS CORP.

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

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

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 508: Oil Pump Screen
Courtesy of GENERAL MOTORS CORP.

11. Inspect the oil pump screen for debris or restrictions.

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

OIL PUMP ASSEMBLE

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 509: Oil Pump Driven Gear
Courtesy of GENERAL MOTORS CORP.

1. Install the driven gear into the pump housing.

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

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

clean engine oil.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2