18 12 050 Replacing center silencer (N55 Hybrid)

WARNING: This page does not describe the selected car, but rather 50 other vehicles, including the 2016 BMW M5, 2016 BMW ActiveHybrid 5, 2016 BMW 550i xDrive, 2016 BMW 550i, and 2016 BMW 535i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

31 2 220

WARNING: High-voltage system - danger to life!

The following points must be strictly observed prior to starting work:

Observe SAFETY INFORMATION for handling hybrid cars.

WARNING: Risk of burning!
This repair work may only be carried out on an exhaust system which has cooled down.

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

Fig 1: Supporting Exhaust System Using Special Tool (31 2 220)

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Release screws (1).

Tightening torque 18 31 4AZ .

Only if auxiliary heating fitted. Release screw (2) on metering pump.

Tightening torque 18 31 5AZ .

Release screws (3) on underbody panelling.

Remove reinforcement plate (4).

Fig 2: Identifying Reinforcement Plate, Underbody Panelling And Metering Pump Screw

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.
Carry over separation point to faulty center silencer and mark.
Secure center silencer against falling off.
Cut through exhaust pipes at marked point with a suitable tool.

Fig 3: Identifying Front Intake Pipe Mark Point

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

Slacken nut (1).

Tightening torque 18 20 3AZ .

Fig 4: Identifying Exhaust System Nut

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Installation note:

Adjust center silencer to fit and connect with clamps.

Center clamps and tighten down.

Tightening torque 18 31 7AZ .

The procedure is identical on both sides.

Move the reinforcement rod from the defective center sound absorber to the new center sound absorber.

Fig 5: Identifying Center Clamps

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NOTE: Check exhaust system for leaks.