Catalytic Converter - 3.7L: Installation

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Prior to installation, inspect the Heated Oxygen Sensor (HO2S) and the Catalyst Monitor Sensor (CMS) wiring harness for damage.

NOTE: Using a Scotch Brite® pad, clean the mating surfaces of the manifold outlet flare and the catalytic converter inlet flare, at the catalytic converter outlet flare and the muffler inlet pipe. Keep foreign materials out of the catalytic converters.

NOTE: Using a jackstand, support the catalytic converter near the rear outlet while positioning the converter into place. Align the manifold studs into the pipe flange. Make sure not to damage the studs or mating surfaces.

NOTE: Hand-tighten all the catalytic converter nuts.

Install the catalytic converter and hand tighten the new LH and RH catalytic converter-to-exhaust manifold nuts.
- Do not tighten the LH and RH catalytic converter-to-exhaust manifold nuts at this time.
NOTE: Similar catalytic converter shown in illustration.

NOTE: Make sure that the catalytic converter is inserted into the couplers correctly.

Slide the Torca® couplers over catalyst pipes and engage the coupler clip completely over the converter button.
- Do not tighten the Torca® couplers at this time.
  
  Fig 1: Locating Coupler Over Catalyst Pipe
  Courtesy of FORD MOTOR CO.
NOTE: Tighten the catalytic converter-to-exhaust manifold nuts alternately in 10 Nm (89 lb-in) increments to maintain torque and draw flange evenly to assure alignment of exhaust system. Tighten the new nuts to 40 Nm (30 lb-ft).

NOTE: Make sure to correctly align the catalytic converter to the exhaust manifold and intermediate pipes before tightening the fasteners.

Tighten the 2 LH catalytic converter-to-exhaust manifold nuts.
- Tighten to 40 Nm (30 lb-ft).
  - Alternately tighten, in 10 Nm (89 lb-in) increments.
NOTE: Tighten the catalytic converter-to-exhaust manifold nuts alternately in 10 Nm (89 lb-in) increments to maintain torque and draw flange evenly to assure alignment of exhaust system. Tighten the new nuts to 40 Nm (30 lb-ft).

Tighten the 2 RH catalytic converter-to-exhaust manifold nuts.
- Tighten to 40 Nm (30 lb-ft).
  - Alternately tighten, in 10 Nm (89 lb-in) increments.
Tighten the Torca® couplers.
- Tighten to 48 Nm (35 lb-ft).
Connect the RH and LH CMS electrical connectors.
Connect the RH and LH HO2S electrical connectors.