Hummer H3. Manual — part 1162

Fig. 15: 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. 16: View Of Catalytic Converter
Courtesy of GENERAL MOTORS CORP.

2. Install the catalytic converter to the exhaust manifold.

3. Install the nuts attaching the catalytic converter to the exhaust manifold. Do not tighten at

this time.

NOTE:

Refer to Exhaust System Inspection Notice .

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3

Fig. 17: View Of Nuts Securing Muffler To Catalytic Converter
Courtesy of GENERAL MOTORS CORP.

4. Align the catalytic converter with the studs located in the muffler.

5. Install the nuts securing the muffler to the catalytic converter. Tighten the nuts by hand until

each contacts the metal flange.

Tighten: Tighten the nuts to 45 N.m (33 lb ft).

6. Tighten the catalytic converter nuts previously installed in step 3.

NOTE:

Refer to Fastener Notice .

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3

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

7. Install the HO2S if previously removed. Refer to Heated Oxygen Sensor 2 Replacement .

2007 Hummer H3

2007 ENGINE Engine Exhaust - H3