Hummer H3. Manual — part 1159

Fig. 5: View Of Bolt Sequence For Exhaust Manifold
Courtesy of GENERAL MOTORS CORP.

5. Tighten the exhaust manifold bolts.

Tighten:

NOTE:

Refer to Fastener Notice .

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3

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

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

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

6. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield

Replacement.

7. Install the exhaust seal. Refer to Exhaust Seal Replacement.

8. Install the AIR check valve. Refer to Secondary Air Injection Check Valve

Replacement .

EXHAUST SEAL REPLACEMENT

Removal Procedure

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

CAUTION: Refer to Exhaust Service Caution .

CAUTION: Refer to Protective Goggles and Glove Caution .

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3

Fig. 6: View Of Catalytic Converter
Courtesy of GENERAL MOTORS CORP.

2. Remove the nuts attaching the catalytic converter to the exhaust manifold.

3. Position the exhaust system rearward, enough to allow clearance to remove the seal.

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3

Fig. 7: View Of Exhaust Manifold Seal
Courtesy of GENERAL MOTORS CORP.

4. Remove and discard the exhaust manifold seal.

Installation Procedure

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3