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. 

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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.

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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.

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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.

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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)  .

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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)  .

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• Tighten down screw (1)  .

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 THE CYLINDERS 1 TO 4 .
• Refer to INSTALLING THE LAMBDA OXYGEN SENSOR FOR THE 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 LOWERING 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 INSTALL THE COVER IN THE ENGINE COMPARTMENT ON THE TOP RIGHT .
• Refer to FILLING THE LOW-TEMPERATURE COOLING SYSTEM WITH THE VACUUM FILLING EQUIPMENT .
• Refer to VENTING THE LOW-TEMPERATURE COOLING SYSTEM .