Catalytic Converter Replacement L47

1. Raise the vehicle. Support the catalytic converter. Do not let the converter hang from the exhaust manifold rear pipe (Y-pipe).



2. Remove the post converter oxygen sensor heat shield.
3. Remove the oxygen sensors. Refer to Engine Controls for oxygen sensor replacement.



4. Cut the intermediate pipe(2) at the converter. Cut the pipe as close to the weld as the tool will permit(1).



5. Remove the exhaust manifold rear pipe flange bolts.



6. Remove the catalytic converter.
7. Remove portions of the converter outlet that remain in the intermediate pipe.

1. Install the catalytic converter. Position the intermediate pipe for needed clearance during converter installation.
2. Install the catalytic converter seal.



3. Install the exhaust manifold rear pipe flange bolts.

Tighten
Tighten the rear pipe flange bolts to 24 N·m  (15 lb ft).

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.




4. Install the U bolt type clamp.

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




5. Install the oxygen sensor. Refer to Engine Controls.
6. Install the oxygen sensor heat shield.

Catalytic Converter Replacement L36, L67 W/ Front Ex. Pipe

Important: The front pipe and catalytic converter are serviced as an assembly. They are not serviced separately.

1. Remove the oxygen sensor. Refer to Engine Controls for oxygen sensor replacement.
2. Support the catalytic converter.



3. Use the J 29800 in order to cut(1) the exhaust pipe(2).



4. Remove the front catalytic converter to the exhaust manifold nuts and springs.
5. Remove the seal.
6. Remove the front exhaust pipe/catalytic converter assembly.

1. Use the "U" bolt type clamp to install the front exhaust pipe/catalytic converter assembly. Position the clamp so that the nuts are toward the left side of the vehicle.
2. Install the seal.



3. Install the front catalytic converter to the exhaust manifold nuts and springs.

Tighten

•	Tighten the front exhaust pipe to the manifold to 25 N·m (18 lb ft).

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

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.

4. Install the oxygen sensor. Refer to Engine Controls.