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