Chevrolet Silverado / GMC Sierra. Service manual — part 366

Fig. 469: Inspecting Areas Of Valve Lifters
Courtesy of GENERAL MOTORS CORP.

1. Clean the components in cleaning solvent.

IMPORTANT: Components that are to be used again must be marked,

sorted or organized for assembly.

CAUTION: Refer to Safety Glasses and Compressed Air Caution .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

2. Dry the components with compressed air.

3. Inspect the valve lifters for the following conditions:

Bent or broken clip (1)

Worn pushrod socket (2)

Scuffed or worn sides (3)

If the valve lifter shows wear, inspect the engine block lifter bores for wear or
damage.

Flat spots on the roller (4)

Loose or damaged pin (5)

Plugged oil hole (6)

Worn or damaged roller bearing

The roller should rotate freely with no binding or roughness.

Valve Guides

Inspect the valve lifter guides for the following conditions:

Cracks or damage

Excessive wear in the lifter mounting bores

CYLINDER HEAD DISASSEMBLE

Tools Required

J 8062 Valve Spring Compressor - Head Off. See Special Tools.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 470: Compressing Valve Spring Using
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

With the components at room temperature, remove the
spark plugs from the cylinder head.

Mark, organize, or sort the cylinder head components for

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

1. Remove the spark plugs from the cylinder heads.

2. Use the J 8062 in order to compress the valve spring. See Special Tools.

Fig. 471: Valve Stem Keys, Valve Spring Cap & Valve Spring
Courtesy of GENERAL MOTORS CORP.

assembly. Return the components to their original
location during assembly.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2