18 12 040 Removing and installing/replacing front silencer (N14, N12, N16, N18)

WARNING: This page is about a different variant/trim than selected.

WARNING: Risk of burning!

This repair work may only be carried out on an exhaust system which has cooled down.

Unfasten clamp.

Tightening torque 18 31 5AZ .

Fig 1: Locating Clamp

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Disconnect exhaust pipe with suitable tool at marked point and deburr.

Interface (1) for front silencer is designated by a notch in the pipe.

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.

Fig 2: Identifying Interface For Front Silencer

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Secure front silencer against falling out.

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

IMPORTANT: Risk of damage!

Secure exhaust pipe of front silencer against falling down with assistance of a second person.

Spray rubber mount (1) with lubricant and detach from exhaust pipe (2).

NOTE: Check rubber mount for damage, replace if necessary.

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

Fig 3: Identifying Rubber Mount With Lubricant And Rear Silencer

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Installation note:

Connect rear silencer to front silencer by means of a clamp.

Align rear silencer to rear apron.

Align clamp and tighten down.

Tightening torque 18 31 6AZ .

Fig 4: Identifying Centre Clamp

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check exhaust system for tightness.