18 12 050 Replacing center silencer (N74)

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WARNING: Risk of burns!

Only perform these tasks after exhaust system has cooled down.

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

Fig 1: Supporting Centre Silencer Using Special Tool (31 2 220) And Suitable Universal Lifter

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: see 2AZ in 18 20 EXHAUST SYSTEM SUSPENSION

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

Tightening torque: see 3AZ in 18 20 EXHAUST SYSTEM SUSPENSION

Release screws (3) on underbody panelling.

Remove reinforcement plate (4).

Fig 2: Identifying Reinforcement Plate And Screws

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 center silencer (2).

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

Secure center silencer against falling off.

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

Fig 3: Identifying Centre Silencer Components

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

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

Check rubber mount for damage. Replaced damaged rubber mounts.

Fig 4: Identifying Rubber Mount

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Adjust center silencer to fit and connect with clamps.

Centre clamps and tighten down.

Tightening torque: see 2AZ in 18 31 EXHAUST SYSTEM

The procedure is identical on both sides.

Fig 5: Identifying Fitting Of Centre Silencer And Clamps

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check exhaust system for leaks.