Hummer H3. Manual — part 527

Fig. 139: Cylinder Head Bolts Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

8. Tighten the cylinder head bolts.

Tighten:

1. Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 N.m (22 lb

ft).

2. Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees

using J 45059 .

3. Tighten the M11 cylinder head bolts (1-10) a final pass to 70 degrees using J 45059 .

NOTE:

Refer toFastener Notice .

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

4. Tighten the M8 cylinder head bolts (11-15) to 30 N.m (22 lb ft). Begin with the center

bolt (11) and alternating side-to-side, work outward tightening all of the bolts.

9. Install the pushrods. Refer to Valve Rocker Arm and Push Rod Replacement.

10. Install the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side

(LH8) .

11. Install the coolant air bleed pipe. Refer to Coolant Air Bleed Pipe Assembly

Replacement (With LH8) .

12. Install the intake manifold. Refer to Intake Manifold Replacement.

13. Install the generator bracket. Refer to Generator Replacement (LH8) .

CYLINDER HEAD REPLACEMENT - RIGHT SIDE

Tools Required

J 45059 Angle Meter

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

Removal Procedure

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 140: Heater Hose Bracket Bolt
Courtesy of GENERAL MOTORS CORP.

1. Remove the oil level indicator. Refer to Oil Level Indicator and Tube Replacement.

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 right exhaust manifold. Refer to Exhaust Manifold Replacement - Right

Side (LH8) .

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

6. Remove the heater hose bracket bolt (1) from the front of the right cylinder head.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 141: Cylinder Head Bolts
Courtesy of GENERAL MOTORS CORP.

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

8. Remove the cylinder head (218).

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

are NOT to be reused.

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