Lincoln Navigator: Exhaust System - 3.5L EcoBoost (272kW/370PS) / Catalytic Converter RH. Removal and Installation

Special Tool(s) / General Equipment

303-476 (T94P-9472-A) Socket, Exhaust Gas Oxygen Sensor TKIT-1994-LM/M TKIT-1994-F TKIT-1994-FLM/FM

Materials

Removal

NOTE: If the catalytic converter is not being replaced, the HO2S and the catalyst monitor sensor do not need to be removed from the catalytic converter. Disconnecting the electrical connectors is still necessary.

NOTE: The exhaust Y-pipe dual catalytic converter is a 2-piece assembly. The LH and RH converters can be serviced separately as needed.

1. With the vehicle in NEUTRAL, position it on a hoist.
   Refer to: Jacking and Lifting (100-02 Jacking and Lifting, Description and Operation).
   

1. Remove the LH catalytic converter.
   Refer to: Catalytic Converter LH (309-00 Exhaust System - 3.5L EcoBoost (272kW/370PS), Removal and Installation).
   

1. Remove the muffler.
   Refer to: Muffler (309-00 Exhaust System - 3.5L EcoBoost (272kW/370PS), Removal and Installation).
   

1. Disconnect the electrical connectors and detach the wire clips.
   

1. Loosen the RH catalytic converter nuts.
   

1. Remove the transmission support insulator.
   Refer to: Transmission Support Insulator (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
   

1. Remove and discard the nuts. Remove the RH catalytic converter .
   

1. Remove and discard the gasket.
   

1. NOTE: This step is only required if you are replacing with new components.

   Apply penetrating oil to sensor. Using the special tool, remove the HO2S and the catalyst monitor sensors.
   Use Special Service Tool: 303-476 (T94P-9472-A)  Socket, Exhaust Gas Oxygen Sensor.
   Material: Motorcraft® Penetrating and Lock Lubricant / XL-1

Installation

1. Clean all exhaust connections before reassembly.
   

1. NOTE: This step is only required if you are replacing with new components.

   Apply anti-seize to thread of sensor. Using the special tool, install the HO2S and the catalyst monitor sensors.
   Use Special Service Tool: 303-476 (T94P-9472-A)  Socket, Exhaust Gas Oxygen Sensor.
   Material: Motorcraft® High Temperature Nickel Anti-Seize Lubricant / XL-2
   Torque: 35 lb.ft (48 Nm)

1. NOTE: Make sure that new gasket is installed.

   Install the new gasket.
   

1. NOTE: Loosely install the new RH catalytic converter nuts. Do not tighten at this time.

   Position the RH catalytic converter in vehicle with a new gasket. Loosely install the RH catalytic converter nuts.
   

1. Install the transmission support insulator.
   Refer to: Transmission Support Insulator (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Removal and Installation).
   

1. NOTE: Evenly tighten the RH catalytic converter nuts.

   Tighten the RH catalytic converter nuts.
   Torque: 30 lb.ft (40 Nm)

1. Install the LH catalytic converter.
   Refer to: Catalytic Converter LH (309-00 Exhaust System - 3.5L EcoBoost (272kW/370PS), Removal and Installation).
   

1. Connect the electrical connectors and attach the wire clips.
   

1. Install the muffler.
   Refer to: Muffler (309-00 Exhaust System - 3.5L EcoBoost (272kW/370PS), Removal and Installation).
   

1. Check the exhaust system for leaks.