Hummer H2. Manual - part 1783

Fig. 320: Cylinder Head & Bolts (Right) 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the spark plugs from the cylinder head. 

2. Remove the cylinder head bolts. 

IMPORTANT: The cylinder head bolts can NOT be used again. Install NEW cylinder head 

bolts during assembly.

NOTE:

After removal, place the cylinder head on two wood blocks to prevent 
damage to the sealing surfaces.

 

2004 Hummer H2 

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

  

3. Remove the cylinder head. 

Fig. 321: Cylinder Head Gasket (Right) 
Courtesy of GENERAL MOTORS CORP. 

4. Remove the gasket.  

5. Discard the gasket.  

6. Discard the cylinder head bolts.  

VALVE LIFTER REMOVAL 

J 3049-A Valve Lifter Remover. See Special Tools and Equipment .

 

2004 Hummer H2 

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

  

Fig. 322: Valve Lifters, Guide & Guide Bolts 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the valve lifter guide bolts (211).  

2. Remove the valve lifters and guide. 

 

2004 Hummer H2 

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

  

Fig. 323: Using J 3049-A To Remove The Stuck Valve Lifters 
Courtesy of GENERAL MOTORS CORP. 

3. Use the J 3049-A or equivalent in order to remove the valve lifters, if required. See Special Tools and 

Equipment . 

IMPORTANT: Some valve lifters may be stuck in their bores because of gum or varnish 

deposits.

 

2004 Hummer H2 

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