BMW 7 Series: Replacing Front Silencer (N63)
Notes
WARNING: Risk of burns! Only perform these tasks after exhaust system has cooled down.
Necessary preliminary work
- Remove rear UNDERBODY PROTECTION
- F03 Only: Remove underbody protection on left and right
Support front silencer with special tool 31 2 220 and a suitable universal lifter.
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Fig. 14: Supporting Front Silencer With Special Tool 31 2 220
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 silencer.
Carry over separation point to faulty front silencer and mark.
Secure front silencer against falling out.
Cut through exhaust pipes at marked point with a suitable tool.
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Fig. 15: Identifying Cutting Line Front Silencer
Picture shows the left side, the procedure for the right side is identical.
Slacken nut (1).
Tightening torque 18 31 1AZ.
Replace self-locking nuts.
Replace seals.
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Fig. 16: Identifying Exhaust System Nuts
Unscrew nuts (1).
Tightening torque 18 20 1AZ.
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Fig. 17: Identifying Unscrew Nuts
Installation note: Install front silencer, adjust, and connect with clamps.
Centre clamps and tighten down.
Tightening torque 18 31 4AZ.
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Fig. 18: Identifying Front Silence With Clamps
NOTE: Check exhaust system for leaks.
READ NEXT:
Replacing Left Or Right Rear Silencer (N63)
Notes
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. 19: Supporting R
Removing And Installing/Renewing Catalytic Converter Cylinder 5-8
(N63)
WARNING: Risk of burning!
Only perform this repair work on an engine that has cooled down.
Necessary preliminary work
Remove ACOUSTIC COVER.
REMOVE BOTH INTAKE SILENCER HOUSINGS.
Remove EXHAUST SY
SEE MORE:
Vacuum Pump
REMOVING AND INSTALLING/REPLACING VACUUM PUMP (N63)
IMPORTANT: Installation note:
Due to the risk of damage to the engine gaskets/seals and the lack of brake
boosting, make sure before starting the engine that all the vacuum lines are
connected.
Vacuum pump is fitted on cylinder head 1 to 4 at rear
System Overview
The Telematics Control Unit (TCU) and the interface box 'High' (ULF-SBX-H)
control units are connected to
the MOST bus. TCU and interface box 'High' may both be fitted in the vehicle for
certain equipment options. In
this case, the telephone function is always implemented in the TCU.
The head uni
