Hummer H3. Manual — part 556

Fig. 241: View Of Engine Flywheel & Bolt
Courtesy of GENERAL MOTORS CORP.

1. Remove the transmission. Refer to Transmission Replacement (3.7L) or Transmission

Replacement (5.3L) .

2. Remove the engine flywheel bolts.

3. Remove the engine flywheel.

4. Clean and inspect the engine flywheel. Refer to Automatic Transmission Flex Plate

Cleaning and Inspection.

Installation Procedure

IMPORTANT: Note the position and direction of the engine flywheel before

removal.

IMPORTANT: The flywheel does not use a locating pin for alignment and

will not initially seat against the crankshaft flange, but will
be pulled onto the crankshaft by the engine flywheel bolts.
This procedure requires a three stage tightening process.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 242: View Of Engine Flywheel & Bolt
Courtesy of GENERAL MOTORS CORP.

1. Install the engine flywheel to the crankshaft.

2. Apply threadlock to the threads of the flywheel bolts. Refer to Adhesives, Fluids,

Lubricants, and Sealers for the correct part number.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 243: Flywheel Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

3. Install the engine flywheel bolts.

Tighten:

1. Tighten the bolts a first pass in sequence to 20 N.m (15 lb ft).

NOTE:

Refer to Fastener Notice .

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

2. Tighten the bolts a second pass in sequence to 50 N.m (37 lb ft).

3. Tighten the bolts a final pass in sequence to 100 N.m (74 lb ft).

4. Install the transmission. Refer to Transmission Replacement (3.7L) or Transmission

Replacement (5.3L) .

ENGINE REPLACEMENT

Special Tools

J 21366 Converter Holding Strap. See Special Tools.

J 38185 Hose Clamp Pliers

J 41798 Engine Lift Bracket. See Special Tools.

Removal Procedure

1. Remove the hood. Refer to Hood Replacement .

2. Place fender covers over both fenders.

3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection

and Connection .

4. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (Non HP2) .

5. Remove the radiator. Refer to Radiator Replacement .

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

7. Disconnect the oil pressure sensor and the oxygen sensors from the rear of the engine.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3