Hummer H2. Manual - part 1814

Fig. 436: Inserting J 24086-9 
Courtesy of GENERAL MOTORS CORP. 

6. Install the piston, connecting rod, piston pin, and J 24086-16A to the J 24086-10 . See Special Tools and 

 

2004 Hummer H2 

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

  

Equipment . 

Fig. 437: Piston, Pin & Connecting Rod Proper Assembly 
Courtesy of GENERAL MOTORS CORP. 

7. Insert J 24086-9 through J 24086-10 and to the piston pin. See Special Tools and Equipment .  

8. Press J 24086-9 until the installer bottoms on the J 24086-10 . See Special Tools and Equipment .  

9. Inspect the piston (1), pin (3), and connecting rod (2) for proper assembly. 

When properly installed, the piston pin (3) should be centered in the connecting rod (2). 

NOTE:

After the installer hub bottoms on the support assembly, do not exceed 35 
000 kPa (5,000 psi) pressure, this could cause damage to the tool.

 

2004 Hummer H2 

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

  

Fig. 438: Upper & Lower Compression Rings & Marks 
Courtesy of GENERAL MOTORS CORP. 

10. 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. 

 

2004 Hummer H2 

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

  

Fig. 439: Piston Rings & Piston 
Courtesy of GENERAL MOTORS CORP. 

11. Using piston ring pliers, install the piston rings onto the piston.  

12. Position the oil control ring end gaps a minimum of 25 mm (1.0 in) from each other.  

13. Position the compression ring end gaps 180 degrees opposite each other. 

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