Hummer H2. Manual - part 1838

1. Remove the ignition coil and bracket assembly, bolts, and wire harness from the left cover, if required. 

Fig. 520: Ignition Coil & Bracket Assembly (Right) 
Courtesy of GENERAL MOTORS CORP. 

2. Remove the ignition coil and bracket assembly, bolts, and wire harness from the right cover, if required. 

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If the oil fill tube or crankcase vent valve grommet have been 
removed from the rocker arm covers, install a NEW tube or grommet 
during assembly.  

 

2004 Hummer H2 

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

  

Fig. 521: View Of Oil Fill Tube 
Courtesy of GENERAL MOTORS CORP. 

3. Inspect the tube for a loose fit or damage.  

4. Remove the oil fill cap and tube from the right cover, if required. 

 

2004 Hummer H2 

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

  

Fig. 522: Valve Rocker Arm Cover Gasket 
Courtesy of GENERAL MOTORS CORP. 

5. Remove the gaskets (504) from the covers.  

6. Remove the cover mounting bolts, with grommets. 

Cover mounting bolts and grommets that are not damaged may be used again during assembly. 

7. Clean the covers in solvent. 

 

2004 Hummer H2 

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

  

Fig. 523: Valve Rocker Arm Cover (Left) 
Courtesy of GENERAL MOTORS CORP. 

8. Dry the covers with compressed air.  

9. Inspect the ventilation system passages for restrictions.  

10. Inspect the gasket grooves for damage.  

11. Inspect the coil bracket threaded bolt holes for damage or debris. 

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