Hummer H2. Manual - part 1872

Fig. 643: Cylinder Head Gasket (Left) 
Courtesy of GENERAL MOTORS CORP. 

7. Install the NEW left cylinder head gasket onto the locating pins. 

IMPORTANT: When properly installed, the tab on the left cylinder head gasket will be 

located left of center, or closer to the front of the engine.

 

2004 Hummer H2 

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

  

Fig. 644: Cylinder Head & Bolts (Left) 
Courtesy of GENERAL MOTORS CORP. 

8. Install the cylinder head onto the locating pins and the gasket.  

9. Install the NEW cylinder head bolts. 

 

2004 Hummer H2 

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

  

Fig. 645: Cylinder Head Bolt Tightening Sequence (Right) 
Courtesy of GENERAL MOTORS CORP. 

10. Tighten the first design cylinder head bolts. 

Tighten:  

1. Tighten the first design M11 cylinder head bolts a first pass in sequence to 30 N.m (22 lb ft).  

2. Tighten the first design M11 cylinder head bolts a second pass in sequence to 90 degrees using the 

J 45059 . See Special Tools and Equipment .  

3. Tighten the first design M11 cylinder head bolts (1,2,3,4,5,6,7,8) to 90 degrees and the M11 

cylinder head bolts (9 and 10) to 50 degrees a final pass in sequence to using the J 45059 . See 
Special Tools and Equipment .  

4. Tighten the M8 cylinder head bolts (11,12,13,14,15) to 30 N.m (22 lb ft). Begin with the center bolt 

(11) and alternating side-to-side, work outward tightening all of the bolts.  

11. Tighten the second design cylinder head bolts. 

Tighten:  

1. Tighten the second design M11 cylinder head bolts (1-10) a first pass in sequence to 30 N.m (22 lb 

ft).  

2. Tighten the second design M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees 

using the J 45059 . See Special Tools and Equipment .  

3. Tighten the second design M11 cylinder head bolts (1-10) a final pass in sequence to 70 degrees 

using the J 45059 . See Special Tools and Equipment .  

4. Tighten the M8 cylinder head bolts (11,12,13,14,15) to 30 N.m (22 lb ft). Begin with the center bolt 

(11) and alternating side-to-side, work outward tightening all of the bolts.  

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

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

  

CYLINDER HEAD INSTALLATION - RIGHT

Tools Required 

z

J 42385-100 Head/Main Bolt Thread Repair Kit. See Special Tools and Equipment .  

z

J 45059 Angle Meter. See Special Tools and Equipment .  

Fig. 646: Cylinder Head Locating Pins Installation Position 
Courtesy of GENERAL MOTORS CORP. 

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

 

2004 Hummer H2 

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