Hummer H2. Manual - part 1805

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Worn, grooved, or damaged hub seal surface 

A crankshaft balancer hub seal surface with excessive scoring, grooves, rust or other damage must 
be replaced. 

Minor imperfections on the hub seal surface may be removed with polishing compound or fine 
grade emery cloth. 

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Dirty or damaged belt grooves 

The balancer belt grooves should be free of any nicks, gouges, or other damage that may not allow 
the belt to track properly. 

Minor imperfections may be removed with a fine file. 

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Worn, chunking or deteriorated rubber between the hub and pulley  

ENGINE FLYWHEEL CLEANING AND INSPECTION 

IMPORTANT: In order for the belt to track properly, the belt grooves should be free 

of all dirt or debris.

 

2004 Hummer H2 

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

  

Fig. 403: Engine Flywheel & Bolts (Automatic Transmission) 
Courtesy of GENERAL MOTORS CORP. 

1. Clean the flywheel in solvent.  

2. Dry the flywheel with compressed air.  

3. Inspect the automatic transmission flywheel for the following conditions: 

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Damaged ring gear teeth  

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Stress cracks around the flywheel-to-crankshaft bolt hole locations 

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Welded areas that retain the ring gear onto the flywheel for cracking  

PISTON AND CONNECTING ROD DISASSEMBLE 

IMPORTANT: Do not attempt to repair the welded areas that retain the ring gear to 

the flywheel plate. Install a new flywheel.

 

2004 Hummer H2 

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

  

Press-Fit Piston Pin 

Tools Required 

J 24086-C Piston Pin Remover/Installer Set. See Special Tools and Equipment . 

Fig. 404: Piston & Connecting Rod Components 
Courtesy of GENERAL MOTORS CORP. 

IMPORTANT:

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Disassembly of the piston, press-fit design piston pin, and 
connecting rod may create scoring or damage to the piston pin and 
piston pin bore. If the piston, pin, and connecting rod have been 

 

2004 Hummer H2 

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

  

1. Remove the connecting rod bearings (3) from the rod (2) and cap (4). 

Fig. 405: Piston Rings & Piston 
Courtesy of GENERAL MOTORS CORP. 

2. Using piston ring pliers, remove the piston rings from the piston. 

disassembled, replace the components as an assembly.  

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The disassembly procedure, as shown, is to be used for diagnostic 
purposes only.  

 

2004 Hummer H2 

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