Removing and Installing/Replacing Both Exhaust Manifolds (M54)

Removing And Installing/Replacing Both Exhaust Manifolds (M54)

Necessary preliminary tasks:
^ Secure engine in installation position.
^ Remove front splash guard.
^ Remove reinforcement plate.
^ Remove complete exhaust system.
^ Remove bracket between exhaust manifold and transmission.
^ Detach grounding cable from body.
^ Remove right engine support arm with engine mount.
^ Release nuts on heat shield at bottom.
^ Remove right tension strut.
^ Remove air pump.
^ Release heat shield at top and remove.

Note: The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.

Remove oxygen control sensors.





Remove cover from fuel injectors.

Note: Do not mix up oxygen monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness.

Mark plug connections.

Unclip the cable from the retainer. Disconnect plug. Unclip cable on rear side of engine from cable guide.

Remove oxygen monitor sensor from cylinders 1 to 3 from above.

Note: Rear exhaust manifold with catalytic converter can only be removed after front exhaust manifold with catalytic converter has first been removed.

Remove front exhaust manifold with catalytic converter.

Remove oxygen monitor sensor from cylinders 4 to 6.

Remove rear exhaust manifold with catalytic converter.

Installation:
Clean sealing faces, replace gaskets.
Coat threads with copper paste.
Replace nuts.
Tightening torque, 11 62 1AZ.