Replacing the oil return line

Preliminary work 

• Refer to REMOVING THE FRONT UNDERBODY PROTECTION OR FRONT THRUST FIELD .
• Refer to REMOVING THE UNDERBODY PROTECTION OF THE STEERING GEAR AND THRUST FIELD RESPECTIVELY .
• Refer to REMOVING THE COVER ON LEFT AND RIGHT IN THE ENGINE COMPARTMENT AT THE TOP .
• Refer to REMOVING THE LEFT AND RIGHT FRONT-END STRUT .
• Refer to REMOVING FRONT CROSS CONNECTION .
• Refer to REMOVING THE REAR TOP CROSS CONNECTION .
• Refer to REMOVING THE ACOUSTIC COVER .
• Refer to REMOVING FAN COWL .
• Refer to DRAINING COOLANT .
• Refer to DRAINING THE COOLANT FOR THE CHARGE AIR COOLER .
• Refer to REMOVING LEFT CHARGE AIR COOLER .
• Refer to REMOVING INTAKE SILENCER HOUSING .
• Refer to REMOVING THE COVER OF THE ENGINE COMPARTMENT AT THE REAR LEFT .
• Refer to REMOVING THE COVER OF THE REAR RIGHT ENGINE COMPARTMENT .
• Refer to REMOVING LEFT AND RIGHT WIPER ARM .
• Refer to REMOVING THE COWL COVER .
• Refer to REMOVING TRAILING LINK AT SPRING BOLT .
• Refer to REMOVING THE SEAL FOR THE HOOD REAR .
• Refer to REMOVING THE COWL UPPER PART IN THE CENTER .
• Refer to REMOVING THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 1 TO 4 .
• Refer to REMOVING THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 5 TO 8 .
• Refer to REMOVING ENGINE VENTILATION LINE .
• Refer to REMOVING UPPER HEAT SHIELD .
• Refer to RELEASING SCREW BETWEEN THE LEFT AND RIGHT HEAT SHIELD .
• Refer to REMOVING RIGHT HEAT SHIELD .
• Refer to REMOVING THE LEFT HEAT SHIELD .
• Refer to BENDING THE HEAT SHIELD TO THE REAR .
• Refer to DETACHING THE CHARGE AIR HOSE FROM THE EXHAUST TURBOCHARGER OF CYLINDERS 5 TO 8 .
• Refer to REMOVING LEFT CLEAN AIR PIPE .
• Refer to REMOVING THE LEFT UNFILTERED-AIR DUCT .
• Refer to REMOVING VACUUM PUMP .
• Refer to REMOVING THE CONNECTING SUPPORT FROM THE TUNNEL .
• Refer to REMOVING EXHAUST SYSTEM .
• Refer to REMOVING THE CATALYTIC CONVERTER FOR CYLINDERS 5 TO 8 .
• Refer to RELEASING THE OIL FEED LINE FROM THE EXHAUST TURBOCHARGER OF CYLINDERS 5 TO 8 .
• Unscrew the banjo bolt (1). Release the oil feed line (2) and set aside.

  Courtesy of BMW OF NORTH AMERICA, INC.

• Refer to RELEASING THE BANJO BOLT FROM THE COOLANT RETURN LINE ON THE EXHAUST TURBOCHARGER FOR CYLINDERS 5 TO 8 .
• Refer to DETACHING OIL RETURN LINE FROM THE OIL RETURN COVER OF CYLINDERS 5 TO 8 .
• Refer to DETACHING THE COOLANT FEED LINE ON THE EXHAUST TURBOCHARGER FOR CYLINDERS 5 TO 8 .
• Refer to RELEASING THE BANJO BOLT FOR THE COOLANT FEED LINE ON THE EXHAUST TURBOCHARGER FOR CYLINDERS 5 TO 8 .
• Refer to REMOVING EXHAUST TURBOCHARGER FOR CYLINDERS 5 TO 8 .
• Refer to CLOSE THE OIL HOLES ON THE EXHAUST TURBOCHARGER .

• Loosen screws (2).
• Remove 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.

  Courtesy of BMW OF NORTH AMERICA, INC.

• Replace oil return line (3) after each disassembly of the exhaust turbocharger.

  Parts  : Oil return line

• Replace gasket (1).

  Parts  : Gasket

• Replace screws (2).

  Parts  : screw

• Position screws (2) in oil return line (3).
• Push seal (1) onto screws (2).

  Courtesy of BMW OF NORTH AMERICA, INC.

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

  To ensure correct screw tightening, a second person is required! 

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work 

• Refer to REPLACING THE SEAL FOR THE EXHAUST GAS TURBOCHARGER .
• Refer to INSERT THE EXHAUST TURBOCHARGER FOR THE CYLINDERS 5 TO 8 .
• Refer to INSTALLING THE CATALYTIC CONVERTER FOR CYLINDERS 5 TO 8 .
• Refer to ALIGNING THE VACUUM PUMP FOR THE CAMSHAFT .
• Refer to REPLACING THE O-RING OF THE VACUUM PUMP .
• Refer to INSTALLING THE VACUUM PUMP .
• Refer to INSTALLING THE LEFT UNFILTERED-AIR DUCT .
• Refer to INSTALLING LEFT CLEAN AIR PIPE .
• Refer to SECURING OIL SUPPLY LINE ON EXHAUST TURBOCHARGER OF CYLINDERS 5 TO 8 .
• Refer to BENDING THE HEAT SHIELD TO THE FRONT .
• Refer to INSTALLING RIGHT HEAT SHIELD .
• Refer to INSTALLING LEFT HEAT SHIELD .
• Refer to TIGHTENING SCREW BETWEEN THE LEFT AND RIGHT HEAT SHIELD .
• Refer to INSTALLING HEAT SHIELD, TOP .
• Refer to INSTALLING ENGINE VENTILATION LINE .
• Refer to INSTALLING THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 1 TO 4 .
• Refer to INSTALLING THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 5 TO 8 .
• Refer to INSTALLING THE CENTER COWL UPPER PART .
• Refer to INSTALLING TENSION STRUT ON SHOCK TOWER .
• Refer to INSTALLING WINDSHIELD PANEL COVER .
• Refer to INSTALLING THE FRONT HOOD SEAL AT THE REAR .
• Refer to INSTALLING LEFT AND RIGHT WIPER ARM .
• Refer to INSTALLING THE REAR RIGHT ENGINE COMPARTMENT COVER .
• Refer to INSTALLING THE LEFT-HAND CHARGE AIR COOLER .
• Refer to INSTALLING FAN COWL .
• Refer to INSTALLING INTAKE FILTER HOUSING .
• Refer to INSTALLING ACOUSTIC COVER .
• Refer to INSTALLING THE COVER OF THE ENGINE COMPARTMENT ON THE REAR LEFT .
• Refer to INSTALLING THE REAR TOP CROSS CONNECTION .
• Refer to INSTALLING FRONT CROSS CONNECTION .
• Refer to INSTALLING THE COVER ON THE LEFT AND RIGHT IN THE ENGINE COMPARTMENT AT THE TOP .
• Refer to INSTALLING FRONT-END STRUT ON LEFT AND RIGHT .
• Refer to INSTALLING EXHAUST SYSTEM .
• Refer to INSTALLING THE CONNECTING SUPPORTS ON THE TUNNEL .
• Refer to CONNECTING THE COOLANT HOSE TO THE AUXILIARY COOLANT PUMP .
• Refer to CONNECTING THE COOLANT HOSE TO THE RADIATOR .
• Refer to FILLING THE COOLING SYSTEM WITH THE VACUUM FILLING UNIT .
• Refer to FILLING THE LOW-TEMPERATURE COOLING SYSTEM WITH THE VACUUM FILLING EQUIPMENT .
• Refer to VENTING THE LOW-TEMPERATURE COOLING SYSTEM .
• Refer to VENTING THE HIGH-TEMPERATURE COOLANT SYSTEM .
• Refer to INSTALLING THE UNDERBODY PROTECTION OF THE STEERING GEAR OR THE FRONT THRUST FIELD .
• Refer to INSTALLING THE FRONT UNDERBODY PROTECTION OR FRONT THRUST FIELD .