Hummer H2. Manual - part 1790

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J 24270 Cylinder Bore Ridge Reamer. See Special Tools and Equipment .  

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J 41556 Connecting Rod Guide. See Special Tools and Equipment .  

Fig. 348: Removing Cylinder Ridge Using J 24270 
Courtesy of GENERAL MOTORS CORP. 

1. Use the J 24270 in order to remove the cylinder bore ring ridge, if required. See Special Tools and 

Equipment . 

1. Turn the crankshaft until the piston is at the bottom of the stroke.  

2. Place a cloth on top of the piston.  

3. Use the J 24270 or equivalent in order to remove a cylinder ring ridge. See Special Tools and 

Equipment .  

4. Turn the crankshaft so the piston is at the top of the stroke. 

IMPORTANT: The connecting rods and the bearing caps are NOT interchangeable.

 

2004 Hummer H2 

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

  

5. Remove the cloth.  

6. Remove the cutting debris from the cylinder and piston.  

Fig. 349: Connecting Rod & Bolts 
Courtesy of GENERAL MOTORS CORP. 

IMPORTANT:

 

2004 Hummer H2 

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

  

2. Remove the connecting rod bolts. 

3. Remove the connecting rod cap. Refer to Separating Parts . 

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Using a paint stick or etching tool, place matchmarks or numbers on 
the connecting rods and the connecting rod caps. The connecting 
rods and caps MUST be assembled to their original position and 
direction.  

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A stamping mark on the side of the connecting rod, at the crank 
journal, may affect component geometry.  

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Mark the top of the piston to the specific cylinder bore.  

IMPORTANT: Mark, sort, or organize the connecting rod bearings so they may be 

installed to their original position and location.

 

2004 Hummer H2 

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

  

Fig. 350: View Of J 41556 
Courtesy of GENERAL MOTORS CORP. 

4. Install the J 41556 to the connecting rod. See Special Tools and Equipment . 

 

2004 Hummer H2 

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