Hummer H3. Manual — part 93

1. Position drive belt idler pulley to the engine.

2. Install the drive belt idler pulley bolts.

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

3. Install the drive belt. Refer to Drive Belt Replacement (Without A/C) or Drive Belt

Replacement (With A/C).

ENGINE MOUNT INSPECTION

1. Measure the engine movement at the engine mount in order to inspect for damage to the

rubber portions of the mount.

1. Apply the park brake.

2. Start the engine.

3. Firmly apply and hold the primary brakes.

4. Have an assistant stand to the side of the vehicle in order to observe for engine

movement.

5. Slightly load the engine shifting from drive to reverse a few times.

6. If the engine moves more than 24 mm (0.945 in) from the at rest position, in either

direction, inspect for loose engine mount bolts.

2. If the engine mount bolt torque is within specifications, inspect the condition of the engine

mount.

3. Replace the engine mount if any of the following conditions exist:

NOTE:

Refer to Fastener Notice in Cautions and Notices.

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.

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.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Heat check cracks cover the rubber cushion surface.

The rubber cushion is separated from the metal plate of the mount.

There is a split through the rubber cushion.

ENGINE MOUNT REPLACEMENT - LEFT

Removal Procedure

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in

General Information.

2. Remove the wheel and tire assembly. Refer to Tire and Wheel Removal and Installation

in Wheels and Tires.

3. Remove the engine shield, if equipped. Refer to Engine Shield Replacement in Frame and

Underbody

4. Remove the lower intermediate steering shaft. Refer to Intermediate Steering Shaft

Replacement - Lower in Steering Wheel and Column.

5. Support the engine using a jack stand and a block of wood.

6. Remove the left engine mount-to-frame bracket through bolt.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 41: Left Engine Mount-To-Frame Bracket Through Bolt
Courtesy of GENERAL MOTORS CORP.

7. Loosen the right side through bolt.

8. Remove the heater pipe bracket bolt from the engine mount. Refer to Heater Hose

Replacement - Outlet in Heating, Ventilation, and Air Conditioning.

9. Raise the engine using the jack stand; the engine will tilt to one side.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

10. Remove the engine mount bolts.

Fig. 42: Engine Mount
Courtesy of GENERAL MOTORS CORP.

11. Remove the engine mount. You will need to articulate the mount in order to remove the

mount.

Installation Procedure

1. Install the engine mount. You will need to articulate the mount in order to install the mount.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3