Hummer H2. Manual — part 1877

Fig. 660: Valve Rocker Arm Cover Gasket
Courtesy of GENERAL MOTORS CORP.

4. Install a NEW cover gasket (504) into the right valve rocker arm cover.

2004 Hummer H2

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

Fig. 661: Valve Rocker Arm Cover & Bolts (Right)
Courtesy of GENERAL MOTORS CORP.

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

6. Install the cover bolts with grommets.

Tighten: Tighten the valve rocker arm cover bolts to 12 N.m (106 lb in).

NOTE:

Refer to Fastener Notice in Cautions and Notices.

2004 Hummer H2

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

Fig. 662: Ignition Coil & Bracket Assembly (Right)
Courtesy of GENERAL MOTORS CORP.

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

bracket bolts.

8. Install the ignition coil and bracket assembly and bolts.

Tighten: Tighten the ignition coil and bracket assembly studs to 12 N.m (106 lb in).

ENGINE VALLEY COVER INSTALLATION

2004 Hummer H2

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

Fig. 663: Knock Sensor Oil Seals & Valley Cover
Courtesy of GENERAL MOTORS CORP.

1. Install NEW knock sensor oil seals (520) into the valley cover (555).

Lubricate the seal surfaces with clean engine oil.

IMPORTANT: All gasket surfaces should be free of oil or other foreign material during

assembly.

2004 Hummer H2

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