Hummer H2. Manual - part 1779

Fig. 304: Knock Sensor Wire Harness 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the knock sensor wire harness. 

 

2004 Hummer H2 

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

  

Fig. 305: Knock Sensors 
Courtesy of GENERAL MOTORS CORP. 

2. Remove the knock sensors. 

 

2004 Hummer H2 

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

  

Fig. 306: Engine Valley Cover & Gasket 
Courtesy of GENERAL MOTORS CORP. 

3. Remove the valley cover bolts.  

4. Remove the valley cover and gasket.  

5. Discard the valley cover gasket. 

 

2004 Hummer H2 

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

  

Fig. 307: Knock Sensor Oil Seals & Valley Cover 
Courtesy of GENERAL MOTORS CORP. 

6. Remove the knock sensor oil seals (520) from the cover (555).  

VALVE ROCKER ARM COVER REMOVAL - LEFT 

 

2004 Hummer H2 

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