Hummer H3. Manual — part 515

6. Remove the spark plug wires (724) from the ignition coils.

Twist each plug wire 1/2 turn.

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

7. Remove the ignition coil bracket studs (720).

8. Remove the ignition coil bracket (719).

Fig. 95: Positive Crankcase Ventilation Hose/Pipe/Tube Replacement
Courtesy of GENERAL MOTORS CORP.

9. Remove the positive crankcase ventilation (PCV) hose.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 96: View Of Valve Rocker Arm Cover
Courtesy of GENERAL MOTORS CORP.

10. Loosen the valve rocker arm cover bolts.

11. Remove the valve rocker arm cover.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 97: Rocker Arm Cover Gasket
Courtesy of GENERAL MOTORS CORP.

12. Remove and discard the old gasket (1).

Installation Procedure

IMPORTANT:

All gasket surfaces should be free of oil an/or other foreign
material during assembly.

DO NOT reuse the valve rocker arm cover gasket.

If the PCV valve grommet has been removed from the rocker

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 98: Rocker Arm Cover Gasket
Courtesy of GENERAL MOTORS CORP.

1. Install a NEW rocker cover gasket (1).

cover, install a NEW grommet during assembly.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3