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Home >> BMW >> 2009 >> 650i 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 3035 (Exhaust System - Repair) >> Mufflers, Petrol >> 18 12 031 Replacing rear silencer (S63)

18 12 031 Replacing rear silencer (S63)

WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required: 

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

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

Fig 1: Supporting Rear Silencer Using Special Tool (31 2 220)
G04742070Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: If the separation point is not marked by a punch mark on the pipe, determine the separation point by means of the pipe length on the new rear silencer.

Carry over separation point to faulty rear silencer (3) and mark out.

Secure rear silencer against falling off.

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

Fig 2: Identifying Silencers
G08527319Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 18 20 3AZ .

Fig 3: Identifying Exhaust System Mounting Screws
G08527312Courtesy of BMW OF NORTH AMERICA, INC.

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

Pull off vacuum hose from the exhaust flap.

Fig 4: Identifying Exhaust Flap
G08527313Courtesy of BMW OF NORTH AMERICA, INC.

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

Unscrew nuts (1).

Tightening torque 18 20 4AZ .

Remove earth strap.

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

Fig 5: Identifying Grounding Strap Nuts
G08527314Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Install, adjust new rear silencer and connect with hose clamp.

Centre clamp and tighten down.

Tightening torque 18 31 6AZ .

The procedure is identical on both sides.

Fig 6: Identifying Silencer With Clamps
G04794086Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Check rubber mount for damage.
Replace damaged rubber mount.
Check exhaust system for leaks.