Hummer H2. Manual - part 1753

Fig. 204: Camshaft Front Bolt Holes 
Courtesy of GENERAL MOTORS CORP. 

1. Lubricate the camshaft journals and the bearings with clean engine oil.  

2. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts to the bolt holes in the front of the camshaft. 

3. Using the bolts as a handle, carefully install the camshaft into the engine block.  

4. Remove the three bolts from the front of the camshaft. 

NOTE:

All camshaft journals are the same diameter, so care must be used in 
removing or installing the camshaft to avoid damage to the camshaft 
bearings.

 

2004 Hummer H2 

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

  

Fig. 205: Camshaft Retainer & Bolts 
Courtesy of GENERAL MOTORS CORP. 

5. Install the camshaft retainer and bolts. 

Tighten: Tighten the camshaft retainer bolts to 25 N.m (18 lb ft).

IMPORTANT: Install the retainer plate with the sealing gasket facing the engine block. 

The gasket surface on the engine block should be clean and free of dirt 
and/or debris.

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

  

Fig. 206: Camshaft Sensor & Bolt 
Courtesy of GENERAL MOTORS CORP. 

6. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused.  

7. Lubricate the O-ring seal with clean engine oil.  

8. Install the camshaft sensor and bolt. 

Tighten: Tighten the camshaft sensor bolt to 25 N.m (18 lb ft). 

9. Install the camshaft sprocket and timing chain. Refer to Timing Chain and Sprockets Replacement .  

10. Install the engine front cover. Refer to Engine Front Cover Removal .  

11. Install the valve lifters. Refer to Valve Lifter Replacement . 

 

2004 Hummer H2 

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

  

12. Install the radiator support. Refer to Radiator Support Replacement in Body Front End.  

13. Install the hood. Refer to Hood Replacement in Body Front End.  

14. Lower the hood to the normal position.  

ENGINE FLYWHEEL REPLACEMENT 

Removal Procedure 

Fig. 207: Engine Flywheel & Bolts (Automatic Transmission) 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the automatic transmission. Refer to Transmission Replacement in Automatic Transmission - 

4L60-E.  

2. Remove the engine flywheel bolts.  

IMPORTANT: Note the position and direction of the engine flywheel before removal.

 

2004 Hummer H2 

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