Hummer H2. Manual - part 1798

Fig. 376: Measuring Crankshaft Journals 
Courtesy of GENERAL MOTORS CORP. 

8. Measure the crankpins for the out-of-round.  

9. Measure the crankpins for taper. 

 

2004 Hummer H2 

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

  

Fig. 377: Measuring Crankshaft Thrust Wall Width 
Courtesy of GENERAL MOTORS CORP. 

10. Measure the crankshaft thrust wall width. 

A crankshaft with a thrust wall width in excess of 26.2 mm (1.0315 in) must be replaced.

 

2004 Hummer H2 

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

  

Fig. 378: Measuring Crankshaft Journal Runout 
Courtesy of GENERAL MOTORS CORP. 

11. Measure the crankshaft runout. 

Use wooden V blocks or a fixture to support the crankshaft on the front and rear journals. 

12. Use the J 7872 in order to measure the crankshaft runout at the front and rear intermediate journals.  

13. Use the J 7872 in order to measure the runout of the crankshaft rear flange.  

14. Use the J 7872 in order to measure the runout of the crankshaft position reluctor ring. Reluctor ring 

runout should be measured 1.0 mm (0.04 in) below the ring teeth. 

If the reluctor ring has runout in excess of 0.7 mm (0.028 in), replace the crankshaft. 

 

2004 Hummer H2 

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

  

Fig. 379: Inspecting Bearings For Damage 
Courtesy of GENERAL MOTORS CORP. 

15. Inspect crankshaft bearings for craters or pockets. Flattened sections on the bearing halves also indicate 

fatigue. 

 

2004 Hummer H2 

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