Hummer H2. Manual - part 1730

Fig. 119: Cylinder Head Gaskets (6.0 L)
Courtesy of GENERAL MOTORS CORP.

1. The cylinder head gasket displacement can be verified by markings visible on the top side of the left

gasket locating tab.

Some 4.8/5.3 L head gaskets may have 53 stamped onto the locating tab.

Some 6.0 L head gaskets may have 60 stamped onto the locating tab.

2. Install the pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .

3. Install the right exhaust manifold. Refer to Exhaust Manifold Replacement - Right .

4. Install the coolant air bleed pipe. Refer to Coolant Air Bleed Pipe Assembly Replacement .

5. Install the oil level indicator. Refer to Oil Level Indicator and Tube Replacement .

2004 Hummer H2

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

VALVE LIFTER REPLACEMENT

Tools Required

J 3049-A Valve Lifter Remover. See Special Tools and Equipment .

Removal Procedure

Fig. 120: Valve Lifters & Guide
Courtesy of GENERAL MOTORS CORP.

1. Remove the cylinder head and gasket. Refer to Cylinder Head Replacement - Left or Cylinder Head

Replacement - Right .

2004 Hummer H2

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

2. Remove the valve lifter guide bolts (1).

3. Remove the valve lifters and guide.

Fig. 121: Using J 3049-A To Remove The Stuck Valve Lifters
Courtesy of GENERAL MOTORS CORP.

4. Use J 3049-A or equivalent in order to remove the valve lifters (if required). See Special Tools and

Equipment .

IMPORTANT: Some valve lifters may be stuck in their bores because of gum or varnish

deposits.

2004 Hummer H2

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

Fig. 122: Valve Lifters & Lifter Guides
Courtesy of GENERAL MOTORS CORP.

5. Remove the valve lifters from the guide.

6. Organize or mark the components so that they can be installed in the same location from which they were

removed.

7. Clean and inspect the valve lifters. Refer to Valve Lifters and Guides Cleaning and Inspection in

Engine Mechanical - 6.0L Unit Repair.

Installation Procedure

IMPORTANT: When reusing valve lifters, install the lifters to their original locations.

2004 Hummer H2

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