Chevrolet Silverado / GMC Sierra. Service manual — part 257

2. Install the valve rocker arm cover onto the cylinder head.

3. Install new rocker arm cover grommets, if necessary.

4. Install the rocker arm cover bolts.

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

NOTE:

Refer to Fastener Notice .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 79: View Of Ignition Coil, Bracket Assembly, Wire Harness & Bolts (Left)
Courtesy of GENERAL MOTORS CORP.

5. Apply threadlock to the threads of the bracket bolts. Refer to Sealers, Adhesives, and

Lubricants for the correct part number.

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

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

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

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

Fig. 80: View Of Main Coil Harness & Fuel Injector Electrical Connectors (Left
Side)
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 Upper Intake Manifold Sight Shield

Replacement (6.0L (LQ4)).

VALVE ROCKER ARM COVER REPLACEMENT - RIGHT SIDE

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Removal Procedure

Fig. 81: Identifying Right Side Main Electrical Connectors
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 (5).

3. Disconnect the main electrical connector (4) 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.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2