Chevrolet Silverado / GMC Sierra. Service manual — part 256

Fig. 75: View Of Main Coil Harness & Fuel Injector Electrical Connectors (Left
Side)
Courtesy of GENERAL MOTORS CORP.

1. Remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield

Replacement (6.0L (LQ4)).

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

3. Disconnect the main electrical connector (2) feeding the ignition coils.

4. Remove the harness clips (1).

5. Reposition the engine harness.

6. Remove the spark plug wires 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.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 76: View Of Ignition Coil, Bracket Assembly, Wire Harness & Bolts (Left)
Courtesy of GENERAL MOTORS CORP.

7. Remove the ignition coil bracket studs from the rocker arm cover.

8. Remove the ignition coils and bracket from the rocker arm cover.

9. Remove the valve rocker arm cover bolts.

10. Remove the valve rocker arm cover.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 77: Rocker Arm Cover Gasket
Courtesy of GENERAL MOTORS CORP.

11. Remove the gasket (1) from the rocker cover.

12. Discard the OLD gasket.

13. Clean and inspect the rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and

Inspection.

Installation Procedure

IMPORTANT:

All gasket surfaces should be free of oil an/or other foreign

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 78: Rocker Arm Cover Gasket
Courtesy of GENERAL MOTORS CORP.

1. Install a NEW rocker cover gasket (1) into the valve rocker cover lip.

material during assembly.

DO NOT reuse the valve rocker arm cover gasket.

The valve rocker arm cover bolt grommets may be reused.

If the PCV valve grommet has been removed from the rocker
cover, install a NEW grommet during assembly.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2