2014 Mustang Workshop Manual

SECTION 303-01A: Engine — 3.7L	2014 Mustang Workshop Manual
IN-VEHICLE REPAIR	Procedure revision date: 01/07/2013

Exhaust Manifold — LH

Material
Item	Specification
Motorcraft® Metal Surface Prep ZC-31-A	—

Item	Part Number	Description
1	—	Heated Oxygen Sensor (HO2S) electrical connector (part of 12C508) (2 required)
2	W714265	Catalytic converter-to-exhaust manifold nuts (4 required)
3	5F250	Catalytic converter assembly (Y-pipe)

Item	Part Number	Description
1	W714133	LH exhaust manifold heat shield bolt (2 required)
2	9Y427	LH exhaust manifold heat shield
3	W701706	LH exhaust manifold nut (6 required)
4	9431	LH exhaust manifold
5	9448	LH exhaust manifold gasket
6	W712244	LH exhaust manifold stud (6 required)

Removal

With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100-02 .

NOTE: LH shown, RH similar.
If equipped, remove the 4 nuts (2 shown) and the strut tower cross brace.

Detach and disconnect the RH and LH Heated Oxygen Sensor (HO2S) electrical connectors.

Remove and discard the LH and RH catalytic converter-to-exhaust manifold nuts and lower the catalytic converter assembly.

Remove the 2 bolts and the LH exhaust manifold heat shield.

Remove the 6 nuts and the LH exhaust manifold.
- Discard the nuts and gasket.

Clean and inspect the LH exhaust manifold. For additional information, refer to Section 303-00 .

Remove and discard the 6 LH exhaust manifold studs.

NOTICE: Do not use metal scrapers, wire brushes, power abrasive discs or other abrasive means to clean the sealing surfaces. These may cause scratches and gouges resulting in leak paths. Use a plastic scraper to clean the sealing surfaces.
Clean the exhaust manifold mating surface of the cylinder head with metal surface prep. Follow the directions on the packaging.

Installation

Install 6 new LH exhaust manifold studs.
- Tighten to 12 Nm (106 lb-in).

NOTICE: Failure to tighten the exhaust manifold nuts to specification a second time will cause the exhaust manifold to develop an exhaust leak.
Using a new gasket, install the LH exhaust manifold and 6 new nuts. Tighten in 2 stages in the sequence shown:
- Stage 1: Tighten to 19 Nm (168 lb-in).
- Stage 2: Tighten to 25 Nm (18 lb-ft).

Install the LH exhaust manifold heat shield and the 2 bolts.
- Tighten to 12 Nm (106 lb-in).

Raise the catalytic converter and install the new LH and RH catalytic converter-to-exhaust manifold nuts.
- Tighten to 45 Nm (35 lb-ft).

Connect and attach the RH and LH HO2S electrical connectors.

NOTE: LH shown, RH similar.
If equipped, install the strut tower cross brace and the 4 nuts (2 shown).
- Tighten to 35 Nm (26 lb-ft).