Cherokee 2WD L6-4.0L VIN S (1998)
Exhaust Pipe: Service and Repair
WARNING: If Torches Are Used When Working On The Exhaust System, Do Not Allow The Flame Near The Fuel Lines.
CAUTION: When servicing exhaust system components, disconnect the oxygen sensor connector. Allowing the exhaust system to hang by the
oxygen sensor harness will damage the wiring and/or sensor.
REMOVAL
1. Raise and support the vehicle.
Fig.2 Exhaust Pipe Removal-2.5L/4.0L
2. Saturate the bolts and nuts with heat valve lubricant. Allow 5 minutes for penetration.
Fig.3 Oxygen Sensor Location
3. Disconnect the oxygen sensor connector.
4. Disconnect the exhaust pipe from the engine exhaust manifold. Discard the seal (4.0L engine, only).
5. Support the transmission and remove the rear crossmember.
6. Remove the clamp nuts and clamp. To remove the exhaust pipe from the catalytic converter,apply heat until the metal becomes cherry red.
Disconnect the exhaust pipe from the catalytic converter. Remove the exhaust pipe.
INSTALLATION
1. Assemble exhaust pipe to manifold and catalytic converter loosely to permit proper alignment of all parts.
2. Use a new clamp and tighten tire nuts to 61 Nm (45 ft. lbs.) torque.
3. Connect the exhaust pipe to the engine exhaust manifold. Install a new seal between the exhaust manifold and the exhaust pipe (4.0L engine only).
Tighten the nuts to 31 Nm (23 ft. lbs.) torque.
4. Install the rear crossmember. Install and tighten the four (4) crossmember to rear mount nuts to 22 Nm (16 ft. lbs.) Install and tighten the
crossmember to sill bolts to 42 Nm (31 ft. lbs.) torque. Remove the support from the transmission.
5. Coat the oxygen sensor with anti-seize compound. Install the sensor and tighten the nut to 27 Nm (20 ft. lbs.) torque.
6. Lower the vehicle.
7. Start the engine and inspect for exhaust leaks and exhaust system contact with the body panels. Adjust the alignment, if needed.
