18 12 046 Replacing front silencer (N63)

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required

31 2 220

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

Necessary preliminary tasks:

Remove rear UNDERBODY PROTECTION
F03 Only:
Remove underbody protection on left and right

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

Fig 1: Support Exhaust System With 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 Cutting Line On Centre Muffler

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Fig 3: Identifying Nuts Of Exhaust System

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew nuts (1).

Tightening torque 18 20 1AZ .

Fig 4: Identifying Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Install front silencer, adjust, and connect with clamps.

Centre clamps and tighten down.

Tightening torque 18 31 4AZ .

Fig 5: Identifying Front Silencer Centre Clamps

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check exhaust system for leaks.