Hummer H3. Manual — part 289

The camshaft position actuator must be replaced if it does not unlock when air pressure is
applied, does not lock when air pressure is removed or does not move within the 14-15 mm
(0.55-0.59 in).

REPAIR INSTRUCTIONS - ON VEHICLE

DRIVE BELT REPLACEMENT (WITHOUT A/C)

Removal Procedure

Fig. 33: View Of Drive Belt & Pulleys (Without A/C)
Courtesy of GENERAL MOTORS CORP.

1. Install a 3/8 inch breaker bar into the drive belt tensioner (5).

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

2. Rotate the tensioner (7) clockwise, in order to relieve the tension on the drive belt (1).

3. Slide the drive belt (1) off of the water pump pulley (3).

4. Rotate the drive belt tensioner (7) counterclockwise, allowing the tensioner to return to the

relaxed position.

5. Remove the drive belt (1) from the remaining pulleys.

Installation Procedure

Fig. 34: View Of Drive Belt & Pulleys (Without A/C)
Courtesy of GENERAL MOTORS CORP.

1. Install the drive belt (1) over all the pulleys, except for the water pump pulley (3).

2. Install the 3/8 inch breaker bar into the drive belt tensioner (5).

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

3. Rotate the tensioner (5) clockwise.

4. Install the drive belt (1) over the top of the water pump pulley (3).

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

6. Inspect for proper installation of the drive belt (1) on the pulleys.

DRIVE BELT REPLACEMENT (WITH A/C)

Removal Procedure

IMPORTANT: Ensure the drive belt is properly aligned and seated into the

grooves of the drive pulleys.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 35: View Of Drive Belt & Pulleys (With A/C)
Courtesy of GENERAL MOTORS CORP.

1. Install a 3/8 inch breaker bar into the drive belt tensioner (7).

2. Rotate the tensioner (7) clockwise, in order to relieve the tension on the drive belt (1).

3. Slide the drive belt (1) off of the water pump pulley (2).

4. Rotate the drive belt tensioner (7) counterclockwise, allowing the tensioner to return to the

relaxed position.

5. Remove the drive belt (1) from the remaining pulleys.

Installation Procedure

Fig. 36: View Of Drive Belt & Pulleys (With A/C)

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3