Hummer H3. Manual — part 497

Fig. 26: View Of Drive Belt Tensioner & Bolts
Courtesy of GENERAL MOTORS CORP.

1. Remove the accessory drive belt. Refer to Drive Belt Replacement - Accessory.

2. Remove the drive belt tensioner bolts.

3. Remove the drive belt tensioner.

Installation Procedure

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 27: View Of Drive Belt Tensioner & Bolts
Courtesy of GENERAL MOTORS CORP.

1. Position the drive belt tensioner to the water pump.

2. Install and tighten the drive belt tensioner bolts.

Tighten: Tighten the bolts to 50 N.m (37 lb ft).

3. Install the accessory drive belt. Refer to Drive Belt Replacement - Accessory.

ENGINE MOUNT INSPECTION

NOTE:

Refer to Fastener Notice .

NOTE:

Broken or deteriorated mounts can cause misalignment and
destruction of certain drive train components. When a single mount
breaks, the remaining mounts are subjected to abnormally high
stresses.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Visual/Physical Inspection

1. Support the powertrain using the appropriate support method; refer to the powertrain mount

replacement procedure. Raising the powertrain removes the weight from the engine mount
and creates slight tension in the rubber.

2. Clean the mount and surrounding area to ensure good visibility of the mount condition.

3. Verify all attaching fasteners are present and at the correct torque. Refer to Engine Mount

Replacement - Left Side and/or Engine Mount Replacement - Right Side for any
torque sequencing and/or torque specifications.

4. Slightly raise the engine approximately 5-7 mm.

5. Inspect the mount for any of the following conditions:

Hard rubber surfaces - covered with extreme heat check cracks.

Rubber separation from the metal plate of the engine mount.

Rubber is split through the center of the engine mount.

If equipped with a hydraulic mount, inspect for GLYCOL™ fluid leaking from the
engine mount.

ENGINE MOUNT REPLACEMENT - LEFT SIDE

Removal Procedure

NOTE:

When raising or supporting the engine for any reason, do not use a
jack under the oil pan, any sheet metal, or the crankshaft pulley.
Due to the small clearance between the oil pan and the oil pump
screen, jacking against the oil pan may cause the pan to be bent
against the pump screen. This will result in a damaged oil pickup
unit.

IMPORTANT: Observe the engine mount while raising the engine. If the

engine mount exhibits any of the following conditions the
mount may require replacement. Refer to Engine Mount
Replacement - Left Side and/or Engine Mount Replacement -
Right Side.

IMPORTANT: Before replacing any engine mount due to suspected

fluid loss, verify that the source of the fluid is from the
engine mount , and not the engine or an external source.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 28: Engine Mount Replacement - Left Side
Courtesy of GENERAL MOTORS CORP.

1. Remove the left front wheelhouse panel. Refer to Wheelhouse Panel Replacement

(Front) or Wheelhouse Panel Replacement (Rear) .

NOTE:

When raising or supporting the engine for any reason, do not use a
jack under the oil pan, any sheet metal, or the crankshaft pulley.
Due to the small clearance between the oil pan and the oil pump
screen, jacking against the oil pan may cause the pan to be bent
against the pump screen. This will result in a damaged oil pickup
unit.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3