Catalytic Converter - 3.0L LH Manifold: Installation

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

Install the 6 new LH catalytic converter manifold studs.
- Tighten to 11 Nm (8 lb-ft).
Position a new LH exhaust manifold gasket.

CAUTION: Failure to tighten the catalytic converter nuts to specification before installing the converter bracket bolts will cause the converter to develop an exhaust leak.

CAUTION: Failure to tighten the catalytic converter nuts to specification a second time will cause the converter to develop an exhaust leak.

NOTE: Make sure to tighten the nuts in the sequence in 2 stages.

Position the LH catalytic converter and tighten the 6 exhaust manifold nuts in the sequence shown.
- Stage 1: Tighten to 25 Nm (18 lb-ft).
- Stage 2: Tighten to 25 Nm (18 lb-ft).
  
  Fig 1: Identifying Tightening Sequence Of Exhaust Manifold Nuts
  Courtesy of FORD MOTOR CO.
Position the exhaust Y-pipe gasket.
Position the exhaust Y-pipe and install the 4 exhaust Y-pipe nuts.
- Tighten the nuts to 47 Nm (35 lb-ft).

NOTE: Make sure to apply anti-seize lubricant to the threads of the HO2S before installation

Using the special tool, install the HO2S.
- Tighten to 47 Nm (35 lb-ft).
  
  Fig 2: Identifying Special Tool
  Courtesy of FORD MOTOR CO.
Install the passenger side splash shield and the 5 bolts.

Fig 3: Remove/Install Catalytic Converter Heat Shield
Courtesy of FORD MOTOR CO.
Connect the LH HO2S and catalyst monitor electrical connectors.