18 12 046 Replacing front pipe (N74)

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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 pipe with special tool 31 2 220 and a suitable universal lifter.

Fig 1: Supporting Front Pipe Using 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 pipe (1).

Carry over separation point to defective front pipe and mark.

Secure front pipe against falling off.

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

Fig 2: Identifying Front Pipe Components

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: see 1AZ in 18 31 EXHAUST SYSTEM

Replace self-locking nuts.

Replace seals.

Fig 3: Identifying Exhaust System Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Install front pipe to fit and connect with clamps.

Centre clamps and tighten down.

Tightening torque: see 2AZ in 18 31 EXHAUST SYSTEM

Fig 4: Identifying Front Pipe Centre Clamps

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check exhaust system for leaks.