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