Hummer H2. Manual - part 1725

Fig. 102: View Of Spark Plug 
Courtesy of GENERAL MOTORS CORP. 

3. Loosen the spark plug 1 or 2 turns.  

4. Brush or air blast away any dirt or debris from around the spark plug.  

5. Remove the spark plug. 

IMPORTANT: Remove the spark plugs from the cylinder head with the engine at room 

temperature.

 

2004 Hummer H2 

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

  

Fig. 103: Installing J 22794 Into Spark Hole 
Courtesy of GENERAL MOTORS CORP. 

6. InstallJ 22794 into the spark plug hole. See Special Tools and Equipment .  

7. Attach an air hose to J 22794 . See Special Tools and Equipment .  

8. Apply compressed air to J 22794 in order to hold the valves in place. See Special Tools and 

Equipment . 

 

2004 Hummer H2 

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

  

Fig. 104: Using J 38606 & J 5892-D To Remove Valve Spring 
Courtesy of GENERAL MOTORS CORP. 

9. Use J 38606 in order to compress the valve spring. See Special Tools and Equipment . 

 

2004 Hummer H2 

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

  

Fig. 105: Cylinder Head Components 
Courtesy of GENERAL MOTORS CORP.

 

2004 Hummer H2 

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