Removing the catalytic converter of cylinders 5 to 8

Prerequisite 

• Ignition is switched off.

Preliminary work 

• Refer to REMOVING THE LEFT AND RIGHT UNDERSHIELD (TANK COVER) .
• Refer to REMOVING THE REAR LEFT AND RIGHT TENSION STRUT .
• Refer to REMOVING THE LEFT AND RIGHT REAR DIFFUSER .
• Refer to REMOVE EXHAUST SYSTEM .
• Refer to REMOVING THE ACOUSTIC COVER .
• Refer to REMOVING LEFT INTAKE SILENCER HOUSING .
• Refer to REMOVING RIGHT INTAKE SILENCER HOUSING .
• Refer to REMOVING THE LAMBDA OXYGEN SENSOR .
• Refer to REMOVING THE LEFT LAMBDA OXYGEN SENSOR .
• Refer to REMOVING THE LEFT INTAKE SILENCER BRACKET .
• Refer to REMOVING UPPER HEAT SHIELD .
• Refer to REMOVING TRAILING LINK AT SPRING BOLT .
• Refer to REMOVING THE LEFT UNFILTERED-AIR DUCT .
• Refer to REMOVING COVER FOR THE DME CONTROL UNIT ON LEFT .
• Refer to REMOVING THE DME CONTROL UNIT FOR CYLINDERS 5 TO 8 .
• Refer to REMOVING THE HOLDER FOR THE DME CONTROL UNIT ON THE LEFT .
• Refer to REMOVING THE LEFT OXYGEN SENSOR MONITOR .

• Replace seals on exhaust turbocharger.

  Parts:  Seals

• Guide in and install the catalytic converter (1) for cylinders 5 to 8 in the arrow direction.
• Connect the catalytic converter (1) for cylinders 5 to 8 to the exhaust turbocharger.

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• Guide in and install the catalytic converter (1) for cylinders 1 to 4 in the arrow direction.
• Connect the catalytic converter (1) for cylinders 1 to 4 to the exhaust gas turbocharger.

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• Replace clamps (1) and (2).

  Parts:  Clamps

• Mount clamps (1) and (2) and tighten.

  The circlips (1) and (2) must be mounted with the screw connection to the inside.

  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter to exhaust turbocharger
  cl Replace clamp after disassembly.	Tightening torque  14 Nm

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• Install holder (4).
• Tighten down screws (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter on cylinder head/cylinder head cover/holder
  M8x20	tightening torque  21 Nm

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• Tighten down screws (2).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter on cylinder head/cylinder head cover/holder
  M8x20	tightening torque  21 Nm

• Tighten down screw (3).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter on cylinder head/cylinder head cover/holder
  M8x20	tightening torque  21 Nm

• Install holder (4).
• Tighten down screws (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter on cylinder head/cylinder head cover/holder
  M8x20	tightening torque  21 Nm

  Courtesy of BMW OF NORTH AMERICA, INC.

• Tighten down screws (2).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter on cylinder head/cylinder head cover/holder
  M8x20	tightening torque  21 Nm

• Tighten down screw (3).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter on cylinder head/cylinder head cover/holder
  M8x20	tightening torque  21 Nm

• Feed in left heat shield (2) and connect to the other heat shields.
• Tighten top screw (1) heat shield.
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Heat protection plate
  M6x16	tightening torque  10 Nm

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• Connect heat shield (2) with the lower heat shield.
• Tighten bottom screw (1) heat shield.
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Heat protection plate
  M6x16	tightening torque  10 Nm

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• Thread in right heat shield (2) and connect with the other heat shield.
• Tighten top screw (1) heat shield.
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Heat protection plate
  M6x16	tightening torque  10 Nm

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• Connect heat shield (2) with the lower heat shield.
• Tighten bottom screw (1) heat shield.

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Partially installing the catalytic converter for cylinders 5 to 8 from below 

• Mount catalytic converter for cylinders 1 to 4 on holder.
• Replace screws (1).

  Parts:  Screws

• Tighten down screws (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Catalytic converter to holder
  M8x20 Replace screw.	tightening torque  19 Nm

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• Mount catalytic converter for cylinders 5 to 8 on holder.
• Replace nuts (1).

  Parts:  Nuts

• Tighten nuts (1).

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• Feed in the thrust field (4) in the area (5) of the wheel arch trim panel and position it on the front subframe.
• Replace the bolts (arrows).

  Parts:  Screws

• Tighten screws (arrows).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Thrust field to front axle support
  M10 Replace screws.	Joining torque  56 Nm Angle of rotation  90°

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• Tighten down screws (3).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Cover, steering unit
  Thermoplastic hexagon screw	Tightening torque  2.6 Nm

• Tighten down screws (2).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Wheel arch cover
  Thermoplastic hexagon screw	Tightening torque  2.6 Nm
  Plastic nut	Tightening torque  2.6 Nm

• Tighten down screws (1).