Hummer H3. Manual — part 521

Fig. 118: View Of Valve Rocker Arm Pivot Support
Courtesy of GENERAL MOTORS CORP.

5. Remove the rocker arm pivot support.

Fig. 119: View Of Pushrods
Courtesy of GENERAL MOTORS CORP.

6. Remove the pushrods.

7. Clean and inspect the rocker arms and pushrods, if required. Refer to Valve Rocker Arm

and Push Rod Cleaning and Inspection.

Installation Procedure

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Valve lash is net build, no valve adjustment is required.

Fig. 120: View Of Valve Rocker Arm Pivot Support
Courtesy of GENERAL MOTORS CORP.

1. Lubricate the rocker arms and pushrods with clean engine oil.

2. Lubricate the flange of the rocker arm bolts with clean engine oil. Lubricate the flange or

washer surface of the bolt that will contact the rocker arm.

3. Install the rocker arm pivot support.

IMPORTANT: When reusing the valve train components, always install the

components to the original location and position.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 121: View Of Pushrods
Courtesy of GENERAL MOTORS CORP.

4. Install the pushrods.

IMPORTANT: Make sure that the pushrods seat properly to the valve lifter

sockets.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 122: View Of Rocker Arms & Bolts
Courtesy of GENERAL MOTORS CORP.

5. Install the rocker arms and bolts.

IMPORTANT: Make sure that the pushrods seat properly to the ends of the

rocker arms. DO NOT tighten the rocker arm bolts at this
time.

IMPORTANT: The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3. Cylinders 1, 3, 5

and 7 are the left bank. Cylinders 2, 4, 6 and 8 are the right
bank.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3