Hummer H2. Manual — part 1818

10. Repeat the procedure for the additional inner bearings.

Fig. 451: Driving Bearing From Block Bore
Courtesy of GENERAL MOTORS CORP.

11. For the two end bearings, front and rear, remove the nylon cone and driver bar extension.

12. Drive the bearings out of or into the engine block.

CAMSHAFT AND BEARINGS CLEANING AND INSPECTION

Tools Required

z

J 7872 Magnetic Base Dial Indicator Set

z

J 8520 Cam Lobe Lift Indicator. See Special Tools and Equipment .

2004 Hummer H2

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

Fig. 452: Camshaft & Bearing Inspection Areas
Courtesy of GENERAL MOTORS CORP.

1. Clean the components in solvent.

2. Dry the components with compressed air.

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 threaded bolt holes (3) in the front of the camshaft for damaged threads or debris.

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

7. Inspect the camshaft position reluctor ring for nicks or damage.

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

2004 Hummer H2

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

Fig. 453: Camshaft Retainer & Bolts
Courtesy of GENERAL MOTORS CORP.

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.

2004 Hummer H2

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

Fig. 454: Camshaft Bearings
Courtesy of GENERAL MOTORS CORP.

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 their engine block bearing bores.

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

Bearings with excessive scoring or wear must be replaced.

2004 Hummer H2

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