Replacing Center Muffler

18 12 050 Replacing centre silencer (N74)

Special tools required:





Warning!
Risk of burns!
Only perform these tasks after exhaust system has cooled down.





Support centre silencer with special tool 31 2 220 and a suitable universal lifter.





Release screws (1).

Tightening torque 18 20 2AZ.

Only when auxiliary heater is fitted: release screw (2) on metering pump.

Tightening torque 18 20 3AZ.

Release screws (3) on underbody panelling.

Remove reinforcement plate (4).





Note:
If the separation point is not marked by a punch mark in the pipe, determine the separation point by means of the pipe length on the new centre silencer (2).

Carry over separation point to faulty centre silencer (2) and mark out.

Secure centre silencer against falling off.

Cut through exhaust pipes at marked point with a suitable tool.





Picture shows the left side, the procedure for the right side is identical.

Detach the centre silencer from the rubber mount (1).

Lower and remove centre silencer with assistance of a second person.

Check rubber mount for damage. Replaced damaged rubber mounts.





Installation note:
Adjust centre silencer to fit and connect with clamps.

Centre clamps and tighten down.

Tightening torque 18 31 2AZ.

The procedure is identical on both sides.





Note:
Check exhaust system for leaks.