Hummer H2. Manual - part 1721

Installation Procedure 

IMPORTANT:

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All gasket surfaces should be free of oil or other foreign material during 
assembly.  

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DO NOT reuse the valve rocker arm cover gasket.  

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The valve rocker arm cover bolt grommets may be reused.  

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If the oil fill tube has been removed from the rocker arm cover, install a 
NEW fill tube during assembly.  

 

2004 Hummer H2 

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

  

Fig. 88: Oil Fill Tube 
Courtesy of GENERAL MOTORS CORP. 

1. Lubricate the O-ring seal of the NEW oil fill tube with clean engine oil.  

2. Insert the NEW oil fill tube into the rocker arm cover. 

Rotate the tube clockwise until locked in the proper position.

 

2004 Hummer H2 

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

  

3. Install the oil fill cap into the tube. 

Rotate the cap clockwise until locked in the proper position. 

Fig. 89: Valve Rocker Arm Cover Gasket (Right) 
Courtesy of GENERAL MOTORS CORP. 

4. Install a NEW rocker cover gasket (1) into the valve rocker cover lip. 

 

2004 Hummer H2 

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

  

Fig. 90: Valve Rocker Arm Cover & Bolts (Right) 
Courtesy of GENERAL MOTORS CORP. 

5. Install the valve rocker arm cover onto the cylinder head.  

6. Install new rocker arm cover grommets, if necessary. 

7. Install the rocker arm cover bolts and grommets. 

Tighten: Tighten the bolts to 12 N.m (106 lb in).

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

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