18 12 031 Replacing left or right rear 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: Scalding hazard!
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: Support Exhaust System With Special Tool (31 2 220)

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NOTE: If the cutting line is not marked by a punch mark in the pipe, determine the cutting line by means of the pipe length on the new rear muffler.

Carry over cutting line to faulty rear muffler and mark.

Secure rear silencer against falling off.

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

Fig 2: Identifying Cutting Line On Centre Muffler

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

Slacken nut (1).

Tightening torque 18 20 5AZ .

Fig 3: Identifying Unscrew Nuts

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

Slacken nut (1).

Tightening torque 18 20 5AZ .

Detach hose (2) on vacuum unit.

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

Fig 4: Identifying Nut And Hose On Vacuum Unit

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Installation:

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

Centre clamp and tighten down.

Tightening torque 18 31 4AZ .

The procedure is identical on both sides.

Fig 5: Identifying Centre Muffler With Clamps

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NOTE: Check rubber mount for damage.

Replace damaged rubber mount.

Check exhaust system for leaks.