18 12 046 Replacing front silencer (N20)

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Special tools required:

31 2 220

WARNING: Risk of burning!
Only perform this repair work after the exhaust system has cooled down.

Support front silencer with special tool 31 2 220 and a suitable universal lifter, and secure against falling down.

Fig 1: Supporting Front Silencer Using Special Tool (31 2 220)

Courtesy of BMW OF NORTH AMERICA, INC.

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 silencer.
Carry over separation point to faulty front silencer and mark.
Secure front silencer against falling out.
Cut through exhaust pipes at marked point with a suitable tool.

Fig 2: Identifying Silencer Separation Point

Courtesy of BMW OF NORTH AMERICA, INC.

Release clamp (1).

Tightening torque: 18 31 1AZ .

Feed out front silencer and remove.

Fig 3: Identifying Silencer Clamp

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Connect front silencer to rear silencer by means of clamp and align.

Center clamp and tighten down.

Tightening torque: 18 20 3AZ .

Fig 4: Identifying Front Silencer To Rear Silencer Clamp

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check exhaust system for leaks.

Check rubber mounts, renew damaged rubber mounts.