Hummer H2. Manual - part 1719

4. Install the rocker arm cover bolts. 

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

Fig. 80: Ignition Coil & Bracket Assembly (Left) 
Courtesy of GENERAL MOTORS CORP. 

5. Apply threadlock GM U.S. P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the 

bracket bolts.  

 

2004 Hummer H2 

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

  

6. Install the ignition coils and bracket to the rocker arm cover.  

7. Install the ignition coil bracket studs to the rocker arm cover. 

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

Fig. 81: Harness Clips, Main Coil Harness & Fuel Injector Electrical Connectors 
Courtesy of GENERAL MOTORS CORP. 

8. Install the spark plug wires to the ignition coils.  

9. Re-position the engine harness.  

10. Install the harness clips (1).  

11. Connect the main electrical connector (2) feeding the ignition coils.  

12. Install the CPA lock.  

13. Install the engine sight shield. Refer to Engine Sight Shield Replacement (6.0L (LQ4)) .  

VALVE ROCKER ARM COVER REPLACEMENT - RIGHT 

 

2004 Hummer H2 

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

  

Removal Procedure 

Fig. 82: Harness Clips, Main Coil Harness, Fuel Injectors & (EGR) Valve Electrical Connectors 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the engine sight shield. Refer to Engine Sight Shield Replacement (6.0L (LQ4)) .  

2. Remove the connector position assurance (CPA) lock.  

3. Disconnect the main electrical connector (1) feeding the ignition coils.  

4. Remove the harness clips (2).  

5. Reposition the engine harness.  

6. Remove the spark plug wires from the ignition coils. 

 

2004 Hummer H2 

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

  

z

Twist each plug wire 1/2 turn.  

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Pull only on the boot in order to remove the wire from the ignition coil.  

Fig. 83: Heater Hose Bracket & Nut 
Courtesy of GENERAL MOTORS CORP. 

7. Reposition the surge tank/heater hoses from the heater hose bracket.  

8. Remove the heater hose bracket nut and bracket. 

 

2004 Hummer H2 

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