Hummer H2. Manual - part 1808

Fig. 414: Piston & Connecting Rod Components 
Courtesy of GENERAL MOTORS CORP. 

IMPORTANT:

z

Replace pistons, pins, and connecting rods that are damaged or 
show signs of excessive wear.  

z

The first design press-fit piston, pin, and connecting rod are to be 
serviced as an assembly.  

z

Do not wire brush any part of the piston.  

z

Measurement of the components should be taken with the 
components at normal room temperature.  

 

2004 Hummer H2 

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

  

1. Clean the varnish and carbon from the piston (1) using cleaning solvent. 

2. Dry the components with compressed air. 

CAUTION: Wear safety glasses in order to avoid eye damage.

 

2004 Hummer H2 

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

  

Fig. 415: Cleaning Piston Ring Grooves 
Courtesy of GENERAL MOTORS CORP. 

3. Clean the piston ring grooves with a suitable ring groove cleaning tool.  

4. Clean the oil lubrication holes and slots. 

 

2004 Hummer H2 

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

  

Fig. 416: Inspecting Piston For Damage 
Courtesy of GENERAL MOTORS CORP. 

5. Inspect the piston for the following conditions: 

z

Cracks in the piston ring lands, the piston skirt, or pin bosses  

z

Piston ring grooves for nicks, burrs, or warpage which may cause the piston ring to bind 

MINOR imperfections may be removed from the piston with a fine file. 

z

Scuffed or damaged skirts (2)  

z

Eroded areas at the top of the piston (1) 

 

2004 Hummer H2 

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