Hummer H2. Manual - part 1812

Fig. 428: Connecting Rod Pin Bore 
Courtesy of GENERAL MOTORS CORP. 

6. To determine the full-floating piston pin-to-connecting rod bore clearance, use a micrometer and measure 

the connecting rod pin bore (1) inside diameter (ID).  

7. Subtract the piston pin OD measurement from the connecting rod pin bore ID measurement to determine 

 

2004 Hummer H2 

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

  

pin-to-bore clearance. Refer to Engine Mechanical Specifications . 

Fig. 429: Inspecting Bearings For Damage 
Courtesy of GENERAL MOTORS CORP. 

8. Inspect the connecting rod bearings for craters or pockets. Flattened sections on the bearing halves 

indicate fatigue. 

 

2004 Hummer H2 

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

  

Fig. 430: Inspecting Connecting Rod Bearings For Excess Scoring Or Discoloration 
Courtesy of GENERAL MOTORS CORP. 

9. Inspect the connecting rod bearings for excessive scoring or discoloration.  

10. Inspect the connecting rod bearings for dirt or debris imbedded into the bearing material. 

 

2004 Hummer H2 

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

  

Fig. 431: Inspecting Bearings For Improper Seating 
Courtesy of GENERAL MOTORS CORP. 

11. Inspect the connecting rod bearings for improper seating indicated by bright, polished sections of the 

bearing surface.  

PISTON AND CONNECTING ROD ASSEMBLE 

Press-Fit Piston Pin 

Tools Required 

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

 

2004 Hummer H2 

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