Muffler: Service and Repair

18 10 034 Replacing both rear silencers (N54)





Special tools required:

Warning!
Scalding hazard!
Only perform these tasks on an engine that has cooled down.





Necessary preliminary tasks:
^ Remove reinforcement plate from rear axle
^ Remove tension struts on left and right from rear axle





Support rear silencer with special tool 31 2 220.





Note:
If the cutting line is not marked by a punch mark in the pipe, determine the cutting line by means of the pipe length on the new rear silencer.

Carry over cutting line to faulty rear silencer and mark.

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





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

Release screw (1) on rubber mount.

Tightening torque 18 31 4AZ.





Slacken nut (1).

Tightening torque 18 31 5AZ.





Pull off vacuum hose (1).

Slacken nut (2).

Tightening torque 18 31 5AZ.

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

Installation:





Connect front pipes to rear silencers by means of clamps and align.

Centre clamps and tighten down.

Tightening torque 18 20 3AZ.





Note:
Check exhaust system for leaks.

Check rubber mount for damage.

If necessary, replace damaged rubber mounts.