Chevrolet Silverado / GMC Sierra. Service manual — part 360

J 7872 Magnetic Base Dial Indicator Set

J 8520 Camshaft Lobe Lift Indicator. See Special Tools.

Cleaning and Inspection

Fig. 448: View Of Camshaft Inspection Points
Courtesy of GENERAL MOTORS CORP.

1. Clean the components in solvent.

2. Dry the components with compressed air.

CAUTION: Refer to Safety Glasses and Compressed Air Caution .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

3. Inspect the camshaft bearing journals (1) for scoring or excessive wear.

4. Inspect the camshaft valve lifter lobes (2) for scoring or excessive wear.

5. Inspect the camshaft position (CMP) actuator oil passages (3) for restrictions.

6. Inspect the threaded bolt hole (4) in the front of the camshaft for damaged threads or debris.

7. Inspect the camshaft sprocket pin (204) for damage.

8. Inspect the camshaft retainer plate for wear or a damaged sealing gasket.

If the camshaft retainer plate sealing gasket is not cut or damaged, it may be used again.

Fig. 449: Camshaft Bearings
Courtesy of GENERAL MOTORS CORP.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

9. Inspect the camshaft bearings for proper fit in the engine block. Camshaft bearings have an

interference fit to the engine block and should not be loose in the engine block bearing
bores.

10. Inspect the camshaft bearings for excessive wear or scoring.

Bearings with excessive scoring or wear must be replaced.

Fig. 450: Measure Camshaft Journals With Micrometer
Courtesy of GENERAL MOTORS CORP.

11. Using a micrometer, measure the camshaft journals for wear and out-of-round.

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

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

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

camshaft.

Fig. 451: Measuring Camshaft Lobes
Courtesy of GENERAL MOTORS CORP.

12. Using a micrometer, measure the camshaft lobes for wear. Refer to Engine Mechanical

Specifications.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2