Chevrolet Silverado / GMC Sierra. Manual — part 350

4. Inspect the crankshaft balancer for the following conditions:

Worn, grooved, or damaged hub seal surface

A crankshaft balancer hub seal surface with excessive scoring, grooves, rust or other
damage must be replaced.

Minor imperfections on the hub seal surface may be removed with polishing compound
or fine grade emery cloth.

Dirty or damaged belt grooves

The balancer belt grooves should be free of any nicks, gouges, or other damage that
may not allow the belt to track properly.

Minor imperfections may be removed with a fine file.

Worn, chunking, or deteriorated rubber between the hub and pulley

AUTOMATIC TRANSMISSION FLEX PLATE CLEANING AND INSPECTION

IMPORTANT: In order for the belt to track properly, the belt grooves

should be free of all dirt or debris.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 415: View Of Ring Gear Teeth
Courtesy of GENERAL MOTORS CORP.

1. Clean the flex plate in solvent.

2. Dry the flex plate with compressed air.

3. Inspect the flex plate for the following conditions:

CAUTION: Refer to Safety Glasses and Compressed Air Caution .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Damaged ring gear teeth (1)

Stress cracks around the flex plate-to-crankshaft bolt hole locations (2)

Welded areas (3) that retain the ring gear onto the flex plate for cracking

PISTON AND CONNECTING ROD DISASSEMBLE

IMPORTANT: Do not attempt to repair the welded areas that retain the

ring gear to the flex plate. Install a new flex plate.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2