Replacing the left oil separator

Preliminary work 

• Refer to SUCTION THE AIR CONDITIONING .
• Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
• Refer to REMOVING THE WHEEL .
• Refer to REMOVING THE FRONT SECTION OF THE FRONT WHEEL ARCH COVER .
• Refer to REMOVING THE TOP LEFT COVER IN THE ENGINE COMPARTMENT and REMOVE THE TOP RIGHT COVER IN THE ENGINE COMPARTMENT .
• Refer to REMOVING THE ACOUSTIC COVER .
• Refer to REMOVING UPPER CROSS CONNECTION .
• Refer to REMOVING THE FRONT-END STRUT .
• Refer to REMOVING THE REAR TOP CROSS CONNECTION .
• Refer to REMOVING THE INTAKE FILTER HOUSING ON THE LEFT .
• Refer to PARTIAL UNINSTALLATION OF THE ENGINE VENTILATION LINE OF CYLINDER BANK 2 .
• Refer to REMOVING ENGINE VENTILATION LINE OF CYLINDER BANK 2 .
• Refer to PARTIALLY DETACHING ACTIVATED CARBON FILTER LINE .
• Refer to REMOVING THE OXYGEN SENSOR MONITOR FOR THE CYLINDERS 5 TO 8 .
• Refer to REMOVING THE LEFT INTAKE SILENCER BRACKET .
• Refer to REMOVING THE LEFT UNFILTERED-AIR DUCT .
• Refer to REMOVE RIGHT INTAKE SILENCER HOUSING .
• Refer to PARTIAL UNINSTALLATION OF THE ENGINE VENTILATION LINE OF CYLINDER BANK 1 .
• Refer to REMOVING ENGINE VENTILATION LINE OF CYLINDER BANK 1 .
• Refer to REMOVING THE OXYGEN SENSOR MONITOR FOR THE CYLINDERS 1 TO 4 .
• Refer to REMOVING THE RIGHT INTAKE SILENCER BRACKET .
• Refer to REMOVING THE LOW-TEMPERATURE COOLANT EXPANSION TANK .
• Refer to REMOVING THE CROSS OF THE TRANSMISSION WIRING HARNESS .
• Refer to REMOVING LAMBDA OXYGEN SENSOR FOR THE CYLINDERS 1 TO 4 .
• Refer to REMOVING LAMBDA OXYGEN SENSOR FOR THE CYLINDERS 5 TO 8 .
• Refer to REMOVING UPPER HEAT SHIELD .
• Refer to REMOVING UPPER CATALYTIC CONVERTER NEAR ENGINE FROM CYLINDER BANK 1 .
• Refer to REMOVING THE CATALYTIC CONVERTER NEAR THE ENGINE AT TOP OF CYLINDER BANK 2 .
• Refer to REMOVING OIL FILLER NECK .
• Refer to REMOVING THE RIGHT UNFILTERED-AIR DUCT .
• Refer to REMOVING THE FAN COWL .
• 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 SAFETY PRESSURE SWITCH .
• Refer to DISCONNECTING REFRIGERANT LINE ON THE CONNECTING PIECE .
• Refer to REMOVING THE PRESSURE LINE BETWEEN THE EVAPORATOR AND THE AIR CONDITIONING CONDENSER .
• Refer to REMOVING DRIVE BELT .
• Refer to REMOVING THE FRONT UNDERBODY PROTECTION .
• Refer to REMOVING THE WHEEL ARCH COVER AT THE BOTTOM FRONT LEFT AND BOTTOM RIGHT .
• Refer to DRAINING THE COOLANT FOR THE LOW-TEMPERATURE COOLANT CIRCUIT .
• Refer to DRAINING THE HIGH-TEMPERATURE COOLANT CIRCUIT .
• Refer to REMOVING LEFT AND RIGHT CHARGE AIR COOLER .
• Refer to REMOVING LEFT THROTTLE VALVE ASSEMBLY .
• Refer to REMOVING IGNITION COIL OF CYLINDER BANK 1 .
• Refer to REMOVING IGNITION COIL OF CYLINDER BANK 2 .
• Refer to REMOVING RAIL FROM BANK 2 .
• Refer to REMOVING HIGH PRESSURE RAIL AT CYLINDER BANK 1 .
• Refer to RELEASING THE COOLANT LINE FOR THE EXHAUST TURBOCHARGER .
• Refer to REMOVING FUEL DELIVERY LINE .
• Refer to REMOVING HEAT SHIELD OF THE CRANKCASE VENTILATION FOR CYLINDERS 1 TO 4 .
• Refer to REMOVING THE HEAT SHIELD OF THE CRANKCASE VENTILATION OF THE CYLINDERS 5 TO 8 .
• Refer to REMOVING LEFT HIGH PRESSURE PUMP .
• Refer to REMOVING RIGHT HIGH-PRESSURE PUMP .
• Refer to PARTIALLY RELEASING THE WIRING HARNESS SECTION FOR THE INTEGRATED POWER SUPPLY MODULE .
• Refer to REMOVING WIRING HARNESS SECTION FOR THE IGNITION SYSTEM OF CYLINDER BANK 1 .
• Refer to REMOVING WIRING HARNESS SECTION FOR THE IGNITION SYSTEM OF CYLINDER BANK 2 .
• Refer to REMOVING LEFT CYLINDER HEAD COVER .
• Refer to REMOVING RIGHT CYLINDER HEAD COVER .
• Refer to REMOVING THE COOLANT LINE BETWEEN THE COOLANT PUMP AND HEAT EXCHANGER PARTIALLY .

• Loosen screws (1)  .
• Remove liquid-vapor separator (2)  .
• Replace the oil separator (2)  .

  Parts:  Liquid-vapor separator

• Position the liquid-vapor separator (2)  .
• Tighten down screws (1)  .

Courtesy of BMW OF NORTH AMERICA, INC.