Replacing Front Muffler

18 12 046 Replacing front pipe (N74)

Special tools required:





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





Necessary preliminary work:
^ Remove rear underbody protection
^ F03 Only:

Remove underbody protection on left and right





Support front pipe with special tool 31 2 220 and a suitable universal lifter.





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 front pipe (1).

Carry over separation point to defective front pipe and mark.

Secure front pipe 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.

Slacken nut (1).

Tightening torque 18 31 1AZ.

Replace self-locking nuts.

Replace seals.





Installation note:
Install front pipe to fit and connect with clamps.

Centre clamps and tighten down.

Tightening torque 18 31 2AZ.





Note:
Check exhaust system for leaks.