Hummer H2. Manual — part 1822

Fig. 465: Valve Stem Mating Surfaces, Valve Rocker Arms Bearing & Pushrods
Courtesy of GENERAL MOTORS CORP.

1. Mark, sort, or organize the components for assembly. Refer to Separating Parts .

2. Clean the components with cleaning solvent.

IMPORTANT: Parts that are to be used again must be marked, sorted or organized for

assembly.

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

2004 Hummer H2

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

3. Dry the components with compressed air.

4. Inspect the valve rocker arms bearings (2) for binding or roughness.

5. Inspect the valve rocker arm pushrod sockets (3) and valve stem mating surfaces (1). These surfaces

should be smooth with no scoring or exceptional wear.

Fig. 466: View Of Pushrods
Courtesy of GENERAL MOTORS CORP.

6. Inspect the pushrods for worn or scored ends. These surfaces should be smooth with no scoring or

exceptional wear.

7. Inspect the pushrods for bends. Roll the pushrod on a flat surface to determine if the pushrod is bent.

8. Inspect the pushrod oil passages for restrictions.

2004 Hummer H2

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

Fig. 467: Valve Rocker Arm Pivot Support
Courtesy of GENERAL MOTORS CORP.

9. Inspect the pivot supports for cracks, wear, or other damage.

VALVE LIFTERS AND GUIDES CLEANING AND INSPECTION

1. Mark, sort, or organize the components for assembly. Refer to Separating Parts .

2. Clean the components in cleaning solvent.

IMPORTANT: Components that are to be used again must be marked, sorted or organized for

assembly.

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

2004 Hummer H2

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

3. Dry the components with compressed air.

Fig. 468: Inspecting Valve Lifters
Courtesy of GENERAL MOTORS CORP.

4. Inspect the valve lifters for the following conditions:

z

Bent or broken clip (1)

z

Worn pushrod socket (2)

z

Scuffed or worn sides (3)

2004 Hummer H2

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