Removing and Installing/Replacing Front Exhaust Manifold (M54/N52)

18 40 050 - Removing and installing/replacing front exhaust manifold (M54/N52)





Necessary preliminary tasks:
- Secure engine in installation position Securing Engine In Installation Position (M54)

- Remove reinforcement plate Service and Repair

- Remove complete exhaust system Service and Repair

- Detach grounding cable from body.

- Remove right engine support arm Replacing Right Engine Support Arm with engine mount

- M54: Remove air pump.





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

Remove front control sensor Replacing Oxygen Control Sensor (Cylinders 1-3).





M54: Remove cover from injection valves.

Note:
Do not mix up monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness.
Mark plug connections.
Unclip cable from holder. Disconnect plug connection. Unclip cable on rear side of engine from cable guide.

Remove monitor sensor Replacing Oxygen Monitor Sensor (Cylinders 1-3) from cylinders 1 to 3.





Unscrew nuts.
Remove exhaust manifold (1).

Installation:
Clean sealing faces, replace gaskets.
Replace nuts.
Tightening torque 11 62 1AZ [1][2]11 62 Exhaust Manifold.