Installing left exhaust turbocharger

• Loosen screws (2).
• Detach oil return line (1).
• Ensure that the sealing surfaces in the area of the oil return line are planar and free from oil and grease.
• Replace the seal (3).

  Parts:  Seal

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• Replace the oil return line (3).

  Parts:  Oil return line

• Replace the seal (1).

  Parts:  Seal

• Replace screws (2).

  Parts:  Screws

• Position screws (2).
• Slide seal (1) onto the screws (2).

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• Position the oil return line (1).
• Tighten screws (2) with an electronic torque wrench with tightening angle display.

  A support person is required so that the screws can be tightened correctly. 

  TIGHTENING TORQUE SPECIFICATION
  
  

  Oil return line at the exhaust turbocharger
  M6x16 Replace screws.	Joining torque	5 Nm
  	Angle of rotation	60°

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• Make sure that the seal (3) does not fall out during the feed in.
• Check oil feed line for contamination or obstruction and clean or replace if necessary.
• Replace engine oil and the oil filter if the oil feed line is heavily contaminated.
• Check the clean air ducts on the intake side and charge air cooler for contamination or foreign bodies and clean if necessary.
• If installed: Check the coolant feed lines and coolant return lines for the exhaust turbocharger for contamination or obstruction and clean or replace if necessary.
• Check that screw connections and plug connections for all lines are correct.
• Check the air filter for contamination and clean or replace if necessary.
• Check correct functioning of crankcase ventilation.
• Replace all gaskets.

  Parts:  Seals

• Replace O-ring (1).

  Parts:  O-ring

• Make sure that the O-ring (1) does not fall into the oil duct in the engine block. 

  If the O-ring (1) cannot be removed, the oil return cover must be removed.

• Coat O-ring (1) with engine oil.
  ENGINE OIL SPECIFICATION
  
  

  Technically suitable engine oils for BMW Group engines

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• Thread in exhaust turbocharger with oil return line in downward direction and position it.
• Make sure the oil return line is not mechanically deformed.
• Connect connectors (1) and lock.

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• Replace the V-clip (2).

  Parts:  V-band clamp

• Position V-clip (2).
• Hand-tighten the bolt (1).

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• Position special tool 2 249 171 (2) on cylinder head covers.
• Tighten special tool 2 249 171 (2) with screws (1) on cylinder head covers. Note the screw length while doing so.
  TIGHTENING TORQUE SPECIFICATION
  
  

  Gauge of exhaust turbocharger to cylinder head cover
  screw	Tightening torque	10 Nm

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• Bring the screw (1) of the setting gauge into contact with exhaust turbocharger (2) by hand.
• Exhaust turbocharger (2) must be aligned on vertical axis on left and right.
• Adjust exhaust turbocharger (2) parallel to setting gauge.

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• Tighten screw (1) on the V-clip.
  TIGHTENING TORQUE SPECIFICATION
  
  

  Exhaust turbocharger to exhaust manifold
  V-band clamp Replace V-band clamp.	Tightening torque	9 Nm
  	Tightening torque	20 Nm

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• Check if the screw connection of the V-band clamp is too loose.
• If a gap can be seen between the ends of the V-ribbon clips: Loosen the screw and tighten again.

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• Check if the screw connection of the V-band clamp is too tight.
• If the ends of the V-band clamp are positioned one below the other: Loosen screws and retighten.

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• Make sure that the ends of the V-band clamp are parallel to each other.

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• Loosen screws (1).
• Remove special tool 2 249 171 (2).

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• Tighten down screw (1).
  TIGHTENING TORQUE SPECIFICATION
  
  

  Oil return line to crankcase
  screw	Tightening torque	10 Nm

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• Push hose clamps (1) onto hoses.
• Push the hoses onto the connections.
• Secure hose clamps (1).

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• Replace the screw (1).

  Parts:  Screw

• Replace sealing ring(s) (2).

  Parts:  Sealing ring(s)

  When installing sealing rings without installation aid (bar), both sealing rings must be replaced.

• Position screw (1) with the sealing ring or sealing rings (2) on the oil feed line.
• Position oil feed line.

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• Determining the screw type and selecting the appropriate socket wrench:

  Screw type	Matching socket wrench
  Hexagon screw (3)	Commercial socket wrench (1)
  Multi-tooth screw (4)	Multi-tooth socket wrench (2)

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• Screw in the screw (1) hand-tight.

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• Screw in the screw (1) hand-tight.

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• Tighten down screw (2).
  TIGHTENING TORQUE SPECIFICATION
  
  

  Oil feed line holder to exhaust turbocharger
  M6x16 screw	Tightening torque	10 Nm

• Tighten down screw (1).

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Follow-up work 

• Refer to INSTALLING UPPER CATALYTIC CONVERTER NEAR ENGINE FOR BANK 2 .
• Refer to INSTALLING CATALYTIC CONVERTER NEAR THE ENGINE ABOVE CYLINDER BANK 1 .
• Refer to INSTALLING HEAT SHIELD, TOP .
• Refer to INSTALLING THE LAMBDA OXYGEN SENSOR FOR CYLINDERS 1 TO 4 .
• Refer to INSTALLING THE LAMBDA OXYGEN SENSOR FOR CYLINDERS 5 TO 8 .
• Refer to INSTALLING THE CROSSING OF THE TRANSMISSION WIRING HARNESS .
• Refer to INSTALLING THE COOLANT EXPANSION TANK FOR THE LOW-TEMPERATURE .
• Refer to INSTALLING BRACKET FOR RIGHT INTAKE SILENCER .
• Refer to INSTALLING OIL FILLER NECK .
• Refer to INSTALLING THE OXYGEN SENSOR MONITOR FOR CYLINDERS 1 TO 4 .
• Refer to FASTENING THE ENGINE VENTILATION LINE OF CYLINDER BANK 1 .
• Refer to INSTALLING RIGHT INTAKE SILENCER HOUSING .
• Refer to INSTALLING THE LEFT INTAKE SILENCER BRACKET .
• Refer to INSTALLING THE OXYGEN SENSOR MONITOR FOR CYLINDERS 5 TO 8 .
• Refer to FASTENING THE ACTIVATED-CHARCOAL FILTER LINE .
• Refer to INSTALLING THE CLEAN AIR PIPE OF CYLINDER BANK 2 .
• Refer to INSTALLING THE ENGINE VENTILATION LINE OF CYLINDER BANK 2 .
• Refer to FASTENING THE ENGINE VENTILATION LINE OF CYLINDER BANK 2 .
• Refer to INSTALLING THE HEAT SHIELD OF THE CRANKCASE VENTILATION OF CYLINDERS 5 TO 8 .
• Refer to SECURING THE FUEL SUPPLY LINE ON THE LEFT .
• Refer to INSTALLING IGNITION COIL ON CYLINDER 5 .
• Refer to INSTALLING THE LEFT-HAND CHARGE AIR COOLER .
• Refer to CLOSING THE LOW-TEMPERATURE COOLANT CIRCUIT .
• Refer to INSTALLING FRONT UNDERBODY PROTECTION .
• Refer to INSTALLING THE LOWER LEFT FRONT WHEEL ARCH COVER .
• Refer to INSTALLING FAN COWL .
• Refer to INSTALLING THE LEFT UNFILTERED-AIR DUCT .
• Refer to INSTALLING LEFT INTAKE SILENCER HOUSING .
• Refer to INSTALLING THE REAR TOP CROSS CONNECTION .
• Refer to INSTALLING THE FRONT-END STRUT .
• Refer to INSTALLING UPPER CROSS CONNECTION .
• Refer to INSTALLING ACOUSTIC COVER .
• Refer to INSTALLING THE COVER IN THE ENGINE COMPARTMENT AT TOP LEFT AND RIGHT .
• Refer to FILLING THE LOW-TEMPERATURE COOLING SYSTEM WITH THE VACUUM FILLING EQUIPMENT .
• Refer to VENTING THE LOW-TEMPERATURE COOLING SYSTEM .