Chevrolet Silverado / GMC Sierra. Service manual — part 16

1. Remove the drive belt. Refer to Drive Belt Replacement.

2. Move the drive belt tensioner through it's full travel.

The movement should feel smooth

There should be no binding

The tensioner should return freely

3. If any binding is observed, replace the drive belt tensioner. Refer to Drive Belt Tensioner

Replacement.

4. Install the drive belt. Refer to Drive Belt Replacement.

REPAIR INSTRUCTIONS - ON VEHICLE

DRIVE BELT REPLACEMENT

Removal Procedure

IMPORTANT: When the engine is operating the drive belt tensioner arm

will move. Do not replace the drive belt tensioner because of
movement in the drive belt tensioner arm.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 9: Drive Belt & Tensioner (W/O A/C)
Courtesy of GENERAL MOTORS CORP.

1. Install a 3/8 inch drive breaker bar to the drive belt tensioner arm.

2. Rotate the drive belt tensioner (2) counterclockwise in order to relieve tension on the belt.

3. If equipped without air conditioning (A/C), remove the belt (1) from the pulleys and the

drive belt tensioner.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 10: Drive Belt & Tensioner (W/ A/C)
Courtesy of GENERAL MOTORS CORP.

4. If equipped with A/C, remove the belt (1) from the pulleys and the drive belt tensioner.

5. Slowly release the tension on the drive belt tensioner (2).

6. Remove the breaker bar from the drive belt tensioner.

7. Clean and inspect the belt surfaces of all the pulleys.

Installation Procedure

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 11: Drive Belt & Tensioner (W/ A/C)
Courtesy of GENERAL MOTORS CORP.

1. Route the belt (1) around all the pulleys except the flat idler pulley.

2. Install a 3/8 inch drive breaker bar to the drive belt tensioner arm.

3. Rotate the belt tensioner (2) counterclockwise in order to relieve the tension on the

tensioner.

4. If equipped with A/C, install the belt under the flat idler pulley.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado