Chevrolet Silverado / GMC Sierra. Service manual — part 299

Fig. 224: View Of Camshaft Position (CMP) Sensor & Bolt
Courtesy of GENERAL MOTORS CORP.

1. Remove the hood. Refer to Hood Replacement .

2. Remove the radiator support. Refer to Radiator Support Replacement .

3. Remove the valve lifters from both cylinder heads. Refer to Valve Lifter Replacement.

4. Remove the camshaft sensor bolt and sensor.

5. Remove the engine front cover. Refer to Engine Front Cover Removal.

6. Rotate the engine until the timing marks are aligned.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

7. Remove the camshaft sprocket bolts.

8. Remove the camshaft sprocket and reposition the timing chain.

Fig. 225: View Of Camshaft Retainer Plate
Courtesy of GENERAL MOTORS CORP.

9. Remove the camshaft retainer bolts and retainer.

NOTE:

Do not turn the crankshaft assembly after the timing chain has
been removed in order to prevent damage to the piston
assemblies or the valves.

NOTE:

All camshaft journals are the same diameter, so care must be

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 226: View Of Bolts installed In Camshaft Front Bolt Holes
Courtesy of GENERAL MOTORS CORP.

10. Remove the camshaft.

1. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts to the bolt holes in the front

of the camshaft.

2. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine

block.

3. Remove the three bolts from the camshaft.

11. Clean and inspect the camshaft and bearings. Refer to Camshaft and Bearings Cleaning

used in removing or installing the camshaft to avoid damage to
the camshaft bearings.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

and Inspection.

Installation Procedure

Fig. 227: View Of Bolts installed In Camshaft Front Bolt Holes
Courtesy of GENERAL MOTORS CORP.

1. Lubricate the camshaft journals and the bearings with clean engine oil.

2. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts to the bolt holes in the front of the

camshaft.

IMPORTANT: If camshaft replacement is required, the valve lifters must also be

replaced.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2