Hummer H2. Manual - part 1752

7. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.  

8. Install the camshaft sprocket bolts. 

Tighten: Tighten the camshaft sprocket bolts to 35 N.m (26 lb ft). 

9. Install the oil pump. Refer to Oil Pump, Pump Screen and Deflector Replacement .  

CAMSHAFT REPLACEMENT 

Removal Procedure 

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. 201: Camshaft Sensor & Bolt 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the hood. Refer to Hood Replacement in Body Front End.  

2. Remove the radiator support. Refer to Radiator Support Replacement in Body Front End.  

3. Remove the valve lifters from both cylinder heads. Refer to Valve Lifter Replacement .  

4. Remove the camshaft sensor bolt and sensor.  

5. Remove the engine front cover. Refer to Engine Front Cover Removal .  

6. Rotate the engine until the timing marks are aligned. 

7. Remove the camshaft sprocket bolts.  

8. Remove the camshaft sprocket and reposition the timing chain. 

NOTE:

Do not turn the crankshaft assembly after the timing chain has been 
removed in order to prevent damage to the piston assemblies or the 
valves.

 

2004 Hummer H2 

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

  

Fig. 202: Camshaft Retainer & Bolts 
Courtesy of GENERAL MOTORS CORP. 

9. Remove the camshaft retainer bolts and retainer. 

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. 203: Camshaft Front Bolt Holes 
Courtesy of GENERAL MOTORS CORP. 

10. Remove the camshaft. 

1. 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.  

2. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block.  

3. Remove the three bolts from the camshaft.  

11. Clean and inspect the camshaft and bearings. Refer to Camshaft and Bearings Cleaning and 

Inspection .  

Installation Procedure 

IMPORTANT: If camshaft replacement is required, the valve lifters must also be replaced.

 

2004 Hummer H2 

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