Catalytic Converter Replacement Heavy Duty-6.0L

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the protective shields as necessary.
3. Remove the rear exhaust system. Refer to Rear Exhaust System Replacement .



4. Disconnect the electrical connector from the oxygen sensor.



5. Remove the nuts from the left exhaust manifold.



6. Remove the left side catalytic converter.
7. Transfer the oxygen sensors if the catalytic converter is to be replaced.

1. Install the new exhaust seals to the exhaust manifold.
2. Install the left side catalytic converter.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the new nuts to the left side exhaust manifold.

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




4. Connect the electrical connector to the oxygen sensor.
5. Install the rear exhaust system. Refer to Rear Exhaust System Replacement
6. Remove the safety stands
7. Lower the vehicle.

Catalytic Converter Replacement Light Duty-4.3L, 4.8L, and 5.3L

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the protective shields as necessary.



3. Disconnect the electrical connectors from the oxygen sensors.



4. Remove the right side exhaust manifold stud nuts (3).



5. Remove the left side exhaust manifold stud nuts.



6. Remove the flange stud nuts (2) at the junction of the rear exhaust system and the catalytic convertor.
7. Remove the catalytic convertor.
8. Transfer the oxygen sensors if the catalytic converter is to be replaced.

1. Install the exhaust seals to the exhaust manifolds.
2. Install the catalytic convertor.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the left side exhaust manifold stud nuts.

Tighten
Tighten the nuts to 50 N·m (39 lb ft).




4. Install the right side exhaust manifold stud nuts (3).

Tighten
Tighten the nuts to 50 N·m (39 lb ft).




5. Install the nuts (2) at the rear pipe flange.

Tighten
Tighten the nuts to 40 N·m (30 lb  ft).




6. Connect the electrical connector to the oxygen sensor.
7. Install the protective shields as necessary.
8. Remove the safety stands.
9. Lower the vehicle.