Hummer H2. Manual — part 1844

Fig. 544: Air Bleed Pipe, Hose & Clamp
Courtesy of GENERAL MOTORS CORP.

3. Clean the pipe (307), hose (311), and covers in solvent.

4. Dry the pipe and covers with compressed air.

5. Inspect the pipe and covers for damage or restrictions.

6. Inspect the gasket and hose sealing surfaces for damage.

7. Inspect the hose (311) for restrictions, cracking or wear.

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

The hose may be used again if it is not damaged.

WATER PUMP CLEANING AND INSPECTION

Fig. 545: Water Pump, Bolts & Gaskets
Courtesy of GENERAL MOTORS CORP.

1. Remove the old gasket from the water pump sealing surfaces. Refer to Replacing Engine Gaskets .

2. Clean all excess dirt and debris from the water pump housing.

3. Inspect the water pump for the following:

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Gasket and hose sealing surfaces for excessive scratches or gouging

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Restrictions within the internal coolant passages

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Excessive side-to-side play in the pulley shaft

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Leakage at the water outlet housing or rear cover gasket

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Leakage at the water pump vent hole

A stain around the vent hole is acceptable. If leakage, dripping, occurs with the engine running and
the cooling system pressurized, replace the water pump.

2004 Hummer H2

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

Fig. 546: Inspecting Water Pump Pulley For Wear Or Damage
Courtesy of GENERAL MOTORS CORP.

4. Inspect the water pump pulley for wear or damage in the belt tracking area.

THREAD REPAIR

Tools Required

2004 Hummer H2

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

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J 42385-100 Head/Main Bolt Thread Repair Kit. See Special Tools and Equipment .

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J 42385-200 General Threads Kit. See Special Tools and Equipment .

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J 42385-300 Fixtures/Hardware Kit. See Special Tools and Equipment .

General Thread Repair

Fig. 547: Bushing Type Insert & Base Material
Courtesy of GENERAL MOTORS CORP.

The thread repair process involves a solid, thin walled, self-locking, carbon steel, bushing type insert (1).
During the bushing installation process, the driver tool expands the bottom external threads of the insert into the
base material (2). This action mechanically locks the insert in place. Also, when installed to the proper depth,
the flange of the insert will be seated against the counterbore of the repaired hole.

2004 Hummer H2

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