Hummer H3. Manual — part 520

Fig. 115: Heater Hose Bracket Bolt
Courtesy of GENERAL MOTORS CORP.

12. Install the heater hose bracket bolt (1) to the front of the right cylinder head.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 116: Locating Electrical Components At Top Of Engine
Courtesy of GENERAL MOTORS CORP.

13. Install the spark plug wires to the ignition coils.

14. Position the engine harness, if necessary.

15. Install the harness clips.

16. Connect the main electrical connector (1) feeding the ignition coils.

17. Install the CPA lock.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

18. Install the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight

Shield Replacement.

VALVE ROCKER ARM AND PUSH ROD REPLACEMENT

Removal Procedure

Fig. 117: View Of Rocker Arms & Bolts
Courtesy of GENERAL MOTORS CORP.

1. Remove the rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left

Side or Valve Rocker Arm Cover Replacement - Right Side.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

2. Remove the number one cylinder spark plug. Refer to Spark Plug Replacement .

3. Remove the rocker arm bolts.

4. Remove the rocker arms.

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

and 7 are the left bank.

IMPORTANT: Place the rocker arms, pushrods, and pivot support, in a rack

so that they can be installed in the same location from which
they were removed.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3