Hummer H2. Manual - part 1815

Fig. 440: Piston & Connecting Rod Components 
Courtesy of GENERAL MOTORS CORP. 

14. Install the connecting rod bearings (3) to the rod (2) and cap (4).  

Full-Floating Piston Pin 

 

2004 Hummer H2 

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

  

Fig. 441: Retaining Clip In Pin Bore Groove 
Courtesy of GENERAL MOTORS CORP. 

1. Install the retaining clip. The clip should be seated in the groove of the pin bore. 

 

2004 Hummer H2 

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

  

Fig. 442: Identifying Piston & Components 
Courtesy of GENERAL MOTORS CORP. 

2. Install the piston pin to the piston and connecting rod.  

3. Install the retaining clip. The clip should be seated in the groove of the pin bore. 

 

2004 Hummer H2 

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

  

Fig. 443: Upper & Lower Compression Rings & Marks 
Courtesy of GENERAL MOTORS CORP. 

4. Identify the compression and oil control rings for proper installation. The upper compression ring can be 

identified by a paint mark (3) located 180 degrees from the end gap. The lower compression ring can be 
identified by a paint mark (3) located 90 degrees from the end gap. Both rings should be installed with the 
orientation marks (1, 2) facing the top of the piston. 

IMPORTANT: When installing piston rings, use a ring expander plier type tool. Do not 

roll the rings into the grooves of the piston. Use caution and care to 
expand the rings only slightly larger than the outside diameter (OD) of the 
piston.

 

2004 Hummer H2 

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