Hummer H3. Manual — part 1160

Fig. 8: View Of Exhaust Manifold Seal
Courtesy of GENERAL MOTORS CORP.

1. Install a NEW seal to the exhaust manifold flange.

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3

Fig. 9: View Of Catalytic Converter
Courtesy of GENERAL MOTORS CORP.

2. Position the catalytic converter to the exhaust manifold.

3. Install the nuts attaching the catalytic converter to the exhaust manifold.

Tighten: Tighten the nuts to 50 N.m (37 lb ft).

NOTE:

Refer to Fastener Notice .

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3

4. Lower the vehicle.

CATALYTIC CONVERTER REPLACEMENT

Removal Procedure

CAUTION: Refer to Exhaust Service Caution .

CAUTION: Refer to Protective Goggles and Glove Caution .

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3

Fig. 10: View Of HO2S Electrical Connector
Courtesy of GENERAL MOTORS CORP.

1. Remove the right torsion bar. Refer to Torsion Bar Replacement .

2. Disconnect the heated oxygen sensor (HO2S) at the sensor pigtail (3).

3. Remove the HO2S if replacement is necessary. Refer to Heated Oxygen Sensor 2

Replacement .

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3