Front Exhaust Tube Replacement

NOTE:
Replace the front exhaust tube only if a leak is found in the tube during the leak check.

1. Raise the vehicle on the hoist.





2. WARNING: Wait for the exhaust system to cool before touching exhaust system components. Hot exhaust components can cause severe burns.





3. Remove the cross brace shown in Figure T2.

^ Cross brace is held on with 4 bolts 2 on each side.





4. Remove the front exhaust tube as follows (refer to Figure T3):

a. Disconnect both heated oxygen sensors.

b. Unbolt the front exhaust tube hanger.

^ Hanger is held on with 2 bolts.

c. Unbolt the front exhaust tube from the center exhaust tube.

^ Tube flange is held together with 2 studs and 2 nuts.

d. Unbolt the front exhaust tube from the exhaust manifold.

^ Tube to manifold held together with 3 studs and 3 nuts.

e. Remove the front tube from the vehicle.

5. Swap the heated oxygen sensors (2 and 3) from the old tube to the new tube.

^ If the sensors are seized in the exhaust tube, refer to NTB1O-099 for sensor removal.





^ Refer to Figure T3 for torque specifications.

6. Install front exhaust tube in reverse order.

^ Use a new ring gasket.

^ Use a new flange gasket.

^ Use new nuts for tube to manifold connection.

^ Refer to Figure 13 for torque specifications.

^ Bolts for cross brace; torque to 21-29 N.m (2.1-2.9 kg-m, 15-21 ft-lb).