18 32 085 Replace both exhaust pipes with catalytic converters (N54)

WARNING: This page is about a different variant/trim than selected.

WARNING: Scalding hazard!

Only perform these tasks on an engine that has cooled down.

Support front silencer with special tool 31 2 220 and secure against falling out.

Fig 1: Supporting Front Silencer Using 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 front silencer.

Carry over cutting line to faulty front silencer and mark.

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

Fig 2: Cutting Exhaust Pipes Through Marked Point Using Suitable Tool

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Unscrew nuts (1).

Tightening torque 18 31 1AZ .

Replace self-locking nuts.

Replace seals.

Fig 3: Identifying Self-Locking Nut

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Release bolt and remove bracket (1).

Tightening torque 18 31 2AZ .

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

Fig 4: Identifying Bracket With Bolt

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Installation:

Connect front silencer to rear silencer by means of clamp and align.

Centre clamp and tighten down.

Tightening torque 18 20 3AZ .

Fig 5: Locating Clamps Bolts

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NOTE: Check exhaust system for leaks.