Hummer H2. Manual - part 1833

Fig. 502: Oil Pump Pressure Relief Valve 
Courtesy of GENERAL MOTORS CORP. 

7. Remove the pressure relief valve.  

8. Inspect the oil pump components. Refer to Oil Pump Cleaning and Inspection .  

OIL PUMP CLEANING AND INSPECTION 

IMPORTANT:

z

The internal parts of the oil pump assembly are not serviced 
separately, excluding the spring. If the oil pump components are 
worn or damaged, replace the oil pump as an assembly.  

 

2004 Hummer H2 

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

  

1. Clean the parts in solvent. 

2. Dry the parts with compressed air. 

Fig. 503: Oil Pump Driven Gear 
Courtesy of GENERAL MOTORS CORP. 

3. Inspect the oil pump housing and the cover 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. 

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The oil pump pipe and screen are to be serviced as an assembly. Do 
not attempt to repair the wire mesh portion of the pump and screen 
assembly.  

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

 

2004 Hummer H2 

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

  

Fig. 504: Oil Pump Pressure Relief Valve Plug 
Courtesy of GENERAL MOTORS CORP. 

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

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

 

2004 Hummer H2 

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

  

Fig. 505: Oil Pump Driven Gear 
Courtesy of GENERAL MOTORS CORP. 

8. Inspect the drive gear and driven gear for chipping, galling or wear. 

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

 

2004 Hummer H2 

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