Hummer H3. Manual — part 525

Fig. 133: View Of Oil Level Indicator Tube
Courtesy of GENERAL MOTORS CORP.

1. Lubricate the O-ring seal with clean engine oil.

2. Install the O-ring seal onto the oil level indicator tube.

3. Install the oil level indicator tube behind the exhaust manifold.

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

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

5. Install the oil level indicator tube into the block. Install the tube with the collar flush to the

block.

6. Lower the vehicle.

7. Install the oil level indicator tube bolt.

Tighten: Tighten the bolt to 25 N.m (18 lb ft).

8. Install the oil level indicator to the tube.

9. Install the cylinder number 2 spark plug and wire. Refer to Spark Plug Replacement .

CYLINDER HEAD REPLACEMENT - LEFT SIDE

Tools Required

J 45059 Angle Meter

J 42385-200 Common Thread Repair Kit. See Special Tools.

Removal Procedure

NOTE:

Refer to Fastener Notice .

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 134: View Of Cylinder Head & Bolts
Courtesy of GENERAL MOTORS CORP.

1. Remove the generator bracket. Refer to Generator Replacement (LH8) .

2. Remove the intake manifold. Refer to Intake Manifold Replacement.

3. Remove the coolant air bleed pipe. Refer to Coolant Air Bleed Pipe Assembly

Replacement (With LH8) .

4. Remove the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side

(LH8) .

5. Remove the pushrods. Refer to Valve Rocker Arm and Push Rod Replacement.

IMPORTANT: The cylinder head bolts are of a torque-to-yield design and

are NOT to be reused.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

6. Remove and discard the cylinder head bolts (220, 221).

7. Remove the cylinder head (218).

Fig. 135: Cylinder Head Gasket
Courtesy of GENERAL MOTORS CORP.

8. Remove and discard the cylinder head gasket (217).

9. If required, clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and

Inspection.

Installation Procedure

NOTE:

After removal, place the cylinder head on 2 wood blocks in
order to prevent damage to the sealing surfaces.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3