Exhaust Pipe: Service and Repair

EXHAUST PIPE - 4.7L

REMOVAL

WARNING: IF TORCHES ARE USED WHEN WORKING ON THE EXHAUST SYSTEM, DO NOT ALLOW THE FLAME NEAR THE FUEL LINES.

WARNING: THE NORMAL OPERATING TEMPERATURE OF THE EXHAUST SYSTEM IS VERY HIGH. THEREFORE, NEVER WORK AROUND OR ATTEMPT TO SERVICE ANY PART OF THE EXHAUST SYSTEM UNTIL IT IS COOLED. SPECIAL CARE SHOULD BE TAKEN WHEN WORKING NEAR THE CATALYTIC CONVERTER. THE TEMPERATURE OF THE CONVERTER RISES TO A HIGH LEVEL AFTER A SHORT PERIOD OF ENGINE OPERATION TIME.

1. Raise and support the vehicle.
2. Saturate the bolts and nuts with heat valve lubricant. Allow 5 minutes for penetration.





3. Remove the oxygen sensor from the exhaust pipe.





4. Remove the retaining nuts holding catalytic converter to exhaust pipe.





5. Disconnect the exhaust pipe from the exhaust manifold.

INSPECTION
Discard rusted clamps, broken or worn supports and attaching parts. Replace a component with original equipment parts, or equivalent. This will assure proper alignment with other parts in the system and provide acceptable exhaust noise levels.

INSTALLATION
1. Connect the exhaust pipe to the engine exhaust manifold. Tighten the nuts (A) to 31 Nm (23 ft. lbs.).

NOTE: When servicing the exhaust system, replace the factory installed uni-clamp with standard u-bolt clamps.





2. Position the catalytic converter onto the exhaust pipe flange connection. Tighten retaining nuts to 28 Nm (250 in. lbs.).
3. Coat the oxygen sensor with anti-seize compound. Install the sensor and tighten the nut to 48 Nm (35 ft. lbs.) torque.
4. Lower the vehicle.
5. Start the engine and inspect for exhaust leaks and exhaust system contact with the body panels. Adjust the alignment, if needed.
6. After initial start-up, check the engine exhaust manifold to exhaust pipe nuts for proper torque.