18 10 120 Replacing front pipe (N47 D16/20 K/U/O/T 1)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Risk of burning!
Only perform this repair work after engine has cooled down.
Danger of injury!
Removal of the exhaust system must be carried out with the assistance of a second person.

Support front pipe with a suitable jack and secure against falling down.

Release screws (1).

Remove underbody panelling (2).

Fig 1: Identifying Underbody Panelling And Screws

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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.
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 and deburr.

Fig 2: Identifying Exhaust Pipes Marked Separation Point

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If fitted:

Release screws (1).

Tightening torque 18 20 6AZ .

Remove reinforcement plate (2).

Fig 3: Identifying Reinforcement Plate And Screws

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If fitted:

Release screws (1).

Tightening torque 18 20 6AZ .

Unfasten screws (2).

Tightening torque 18 20 7AZ .

Fig 4: Identifying Reinforcement Plate Screws

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Unfasten nut.

Tightening torque 18 31 2AZ .

Lower and remove front pipe.

Fig 5: Identifying Nut

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Installation note:

Adjust new front pipe to fit and connect with clamps.

Align clamping sleeves so that:

Nuts point downwards.
Cutting line is in middle of clamping sleeve.
There is sufficient spacing to adjoining components.

Center clamp and tighten down.

Tightening torque 18 31 3AZ .

Fig 6: Identifying Nitrogen Oxide Catalytic Converter

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Installation note:

Check rubber mount for damage, replace if necessary.

Check exhaust system for leak tightness.