Hummer H2. Manual - part 1819

Fig. 455: Measuring Camshaft Journals 
Courtesy of GENERAL MOTORS CORP. 

11. Measure the camshaft journals for wear and out-of-round with a micrometer. 

z

If the camshaft bearing journals are more than 0.025 mm (0.001 in) out-of-round, replace the 
camshaft.  

z

If the camshaft bearing journal diameter is less that 54.99 mm (2.164 in), replace the camshaft. 

 

2004 Hummer H2 

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

  

Fig. 456: Measuring Camshaft Lobes 
Courtesy of GENERAL MOTORS CORP. 

12. Measure the camshaft lobes for wear with a micrometer. 

z

A 6.0L camshaft with an intake lobe that measures 46.31 mm (1.823 in) or less must be replaced.  

z

A 6.0L camshaft with an exhaust lobe that measures 46.48 mm (1.830 in) or less must be replaced. 

 

2004 Hummer H2 

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

  

Fig. 457: Measuring Camshaft Runout 
Courtesy of GENERAL MOTORS CORP. 

13. Measure the camshaft runout. 

1. Mount the camshaft in wooden V blocks or between centers on a fixture.  

2. Check the runout of the intermediate camshaft bearing journals using the J 7872 .  

3. If camshaft runout exceeds 0.05 mm (0.002 in), the camshaft is bent and should be replaced.  

Measuring Camshaft Lobe Lift 

 

2004 Hummer H2 

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

  

 

2004 Hummer H2 

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