Hummer H2. Manual — part 1902

Fig. 28: Identifying O2 Sensors
Courtesy of GENERAL MOTORS CORP.

8. Remove the oxygen sensors if the catalytic converter is to be replaced.

Installation Procedure

2004 Hummer H2

2004 ENGINE Engine Exhaust - Hummer H2

Fig. 29: Identifying O2 Sensors
Courtesy of GENERAL MOTORS CORP.

1. If the catalytic converter was replaced, perform the following:

1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen

sensors.

2. Install the oxygen sensors.

Tighten: Tighten the oxygen sensors to 42 N.m (31 lb ft).

NOTE:

Refer to Fastener Notice in Cautions and Notices.

2004 Hummer H2

2004 ENGINE Engine Exhaust - Hummer H2

Fig. 30: Exhaust Manifold Pipe
Courtesy of GENERAL MOTORS CORP.

2. Install a NEW exhaust seal to the exhaust manifold.

3. Install the catalytic converter.

2004 Hummer H2

2004 ENGINE Engine Exhaust - Hummer H2

Fig. 31: Exhaust Manifold Pipe Nuts (Left)
Courtesy of GENERAL MOTORS CORP.

4. Install the left exhaust manifold pipe nuts.

Tighten: Tighten the exhaust manifold pipe nuts to 50 N.m (39 lb ft).

2004 Hummer H2

2004 ENGINE Engine Exhaust - Hummer H2