Exhaust Y-Pipe - Dual Catalytic Converter
Exhaust Y-Pipe - Dual Catalytic Converter
Removal
NOTICE: Do not use oil or grease-based lubricants on isolators as they deteriorate the rubber.
NOTE: The exhaust Y-pipe dual catalytic converter is a 2-piece assembly. The RH and LH converters can be serviced separately as needed.
All vehicles
1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Jacking and Lifting Service and Repair.
2. Disconnect the Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor (CMS) electrical connectors.
3. Remove the transmission support crossmember. For additional information, refer to Full Frame and Body Mounting Service and Repair.
4. Loosen the exhaust and transmission mounting bracket cap bolt.
Rear Wheel Drive (RWD) vehicles
5. Remove the 3 bolts and then slide off the exhaust and transmission mounting bracket from the exhaust Y-pipe dual catalytic converter.
Four-Wheel Drive (4WD) vehicles
6. NOTE: On Four-Wheel Drive (4WD) vehicles, the exhaust and transmission mounting bracket will not slide off the exhaust Y-pipe dual catalytic converter until the exhaust Y-pipe dual catalytic converter is removed from the vehicle.
NOTE: RH side shown, LH side similar.
Remove the 4 bolts from the exhaust and transmission mounting bracket.
All vehicles
7. Remove the 2 exhaust Y-pipe dual catalytic converter-to-muffler assembly bolts.
8. NOTE: LH catalytic converter-to-exhaust manifold nuts shown, RH similar.
Remove the 4 exhaust Y-pipe dual catalytic converter-to-exhaust manifold nuts.
- Discard the nuts.
9. Remove the exhaust Y-pipe dual catalytic converter from the vehicle.
4WD vehicles
10. If necessary, remove the exhaust and transmission mounting bracket from the exhaust Y-pipe dual catalytic converter.
All vehicles
11. If necessary, loosen the RH catalytic converter-to-LH catalytic converter Torca(R) clamp.
12. If necessary, separate the RH catalytic converter from the LH catalytic converter.
Installation
All vehicles
NOTICE: Do not tighten the fasteners until all components are assembled and aligned, making sure to tighten all fasteners beginning at the front of the vehicle. For additional information, refer to Exhaust System Alignment Procedures.
NOTE: Clean the mating surfaces of the exhaust manifold outlet flare and the exhaust Y-pipe dual catalytic converter inlet flares.
Also clean the mating surfaces of the exhaust Y-pipe dual catalytic converter-to-muffler assembly.
1. If separated, install RH catalytic converter to the LH catalytic converter.
4WD vehicles
2. If removed, install the exhaust and transmission mounting bracket to the exhaust Y-pipe dual catalytic converter.
All vehicles
3. Position the exhaust Y-pipe dual catalytic converter into the vehicle.
4. Install the 2 new RH catalytic converter-to-exhaust manifold nuts and tighten in the following sequence:
1. Tighten the RH lower catalytic converter-to-exhaust manifold nut.
- Tighten to 40 Nm (30 lb-ft).
2. Tighten the RH upper catalytic converter-to-exhaust manifold nut.
- Tighten to 40 Nm (30 lb-ft).
5. Install the 2 new LH catalytic converter-to-exhaust manifold nuts and tighten in the following sequence:
1. Snug the LH inner catalytic converter-to-exhaust manifold nut.
2. Tighten the LH outer catalytic converter-to-exhaust manifold nut.
- Tighten to 40 Nm (30 lb-ft).
3. Tighten the LH inner catalytic converter-to-exhaust manifold nut.
- Tighten to 40 Nm (30 lb-ft).
6. If loosened, tighten the RH catalytic converter-to-LH catalytic converter Torca(R) clamp.
- Tighten to 55 Nm (41 lb-ft).
7. Install the 2 exhaust Y-pipe dual catalytic converter-to-muffler assembly bolts and tighten in the following sequence:
1. Snug the outer exhaust Y-pipe dual catalytic converter-to-muffler assembly bolt.
2. Tighten the inner exhaust Y-pipe dual catalytic converter-to-muffler assembly bolt.
- Tighten to 63 Nm (46 lb-ft).
3. Tighten the outer exhaust Y-pipe dual catalytic converter-to-muffler assembly bolt.
- Tighten to 63 Nm (46 lb-ft).
4WD vehicles
8. NOTE: RH side shown, LH side similar.
Install the 4 exhaust and transmission mounting bracket-to-transmission bolts.
- Tighten to 90 Nm (66 lb-ft).
RWD vehicles
9. Slide on the exhaust and transmission mounting bracket to the exhaust Y-pipe dual catalytic converter and install the 3 exhaust and transmission mounting bracket-to-transmission bolts.
- Tighten to 90 Nm (66 lb-ft).
All vehicles
10. Tighten the exhaust and transmission mounting bracket cap bolt.
- Tighten to 35 Nm (26 lb-ft).
11. Install the transmission support crossmember. For additional information, refer to Full Frame and Body Mounting Service and Repair.
12. Connect the HO2S and CMS electrical connectors.
13. Check to see if the exhaust system isolators are at zero load. If the exhaust system isolators are not at zero load, then carry out the exhaust system alignment procedure. For additional information, refer the Exhaust System Alignment Procedures.