Release the chain tensioner

Preliminary work 

• Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
• Refer to REMOVING THE ACOUSTIC COVER .
• Refer to REMOVING THE COVER FOR THE CENTER ENGINE COMPARTMENT .
• Refer to REMOVING FRONT ORNAMENTAL GRILLE .
• Refer to PARTIALLY REMOVING THE FRONT SECTION OF THE FRONT WHEEL ARCH COVER .
• Refer to REMOVING FRONT BUMPER COVER .
• Refer to REMOVING BOTH HEADLIGHTS .
• Refer to REMOVING THE CENTER TOP CROSS CONNECTION .
• Refer to REMOVING THE FANFARE HORN ON THE LEFT .
• Refer to REMOVING THE FANFARE HORN TOWARDS THE RIGHT .
• Refer to REMOVING LEFT AND RIGHT WIPER ARM .
• 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 THE SEAL FOR THE HOOD REAR .
• Refer to REMOVING THE COWL COVER .
• Refer to REMOVING THE COWL UPPER PART IN THE CENTER .
• Refer to REMOVING TRAILING LINK AT SPRING BOLT .
• Refer to REMOVING LEFT INTAKE SILENCER HOUSING .
• Refer to REMOVING THE LEFT-HAND AIR DUCT .
• Refer to REMOVING LEFT INTAKE PORT .
• Refer to PARTIALLY LOOSENING THE LEFT-HAND CHARGE AIR COOLER .
• Refer to REMOVING LEFT THROTTLE VALVE ASSEMBLY .
• Refer to REMOVING RIGHT INTAKE SILENCER HOUSING .
• Refer to REMOVING RIGHT AIR DUCT .
• Refer to REMOVING THE RIGHT THROTTLE BODY .
• Refer to PARTIALLY LOOSENING THE RIGHT-HAND CHARGE AIR COOLER .
• Refer to REMOVING THE REAR TOP CROSS CONNECTION .
• Refer to REMOVING FAN COWL .
• Refer to REMOVING THE ENGINE VENTILATION LINE FROM THE INTAKE SYSTEM .
• Refer to REMOVING THE TANK VENT LINE .
• Refer to REMOVING THE INTAKE PLENUM .
• Refer to REMOVING THE LEFT-HAND VENTILATION LINE .
• Refer to REMOVING IGNITION COILS .
• Refer to REMOVING COVER FOR THE DME CONTROL UNIT ON LEFT .
• Refer to DISCONNECTING ALL CONNECTORS FROM THE DME CONTROL UNIT FOR CYLINDERS 7 TO 12 .
• Refer to PARTIALLY RELEASING THE WIRING HARNESS FROM THE CYLINDER HEAD COVER ON THE LEFT .
• Refer to REMOVING TOP CLEAN AIR PIPE AT LEFT .
• Refer to REMOVING CHARGE AIR PIPE ON LEFT .
• Refer to REMOVING LEFT HIGH PRESSURE LINE BETWEEN HIGH PRESSURE PUMP AND RAIL .
• Refer to REMOVING FUEL DELIVERY LINE .
• Refer to REMOVING ALL HIGH PRESSURE LINES BETWEEN RAIL AND INJECTORS .
• Refer to REMOVING THE HIGH-PRESSURE RAIL ON THE LEFT .
• Refer to REMOVING LEFT HIGH PRESSURE PUMP .
• Refer to REMOVING INJECTORS .
• 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 STIFFENING PLATE .
• Refer to REMOVING FRONT RIGHT WHEEL .
• Refer to LOOSENING THE ANTI-ROLL BAR LINK ON THE LEFT AND RIGHT FROM THE ANTI-ROLL BAR .
• Refer to REMOVING THE COVER FOR THE STEERING ASSEMBLY ON THE RIGHT .
• Refer to REMOVING THE ACTIVE STABILIZER IN FRONT .
• Refer to DRAINING COOLANT .
• Refer to RELEASING THE COOLANT LINE FOR THE EXHAUST TURBOCHARGER ON THE LEFT .
• Refer to REMOVING LEFT CYLINDER HEAD COVER .
• Refer to INSTALLING THE PROTECTIVE SHIELD ON THE RADIATOR .
• Refer to REMOVING THE DRIVE BELT FOR ALTERNATOR 2 AND THE AIR CONDITIONING COMPRESSOR .
• Refer to PARTIALLY DETACHING THE AIR CONDITIONING COMPRESSOR .
• Refer to REMOVING THE COOLANT HOSE ON THE LEFT FROM THE RADIATOR .
• Refer to REMOVING THE HEATER RETURNING HOSE FROM THE COOLANT PUMP .
• Refer to REMOVING ALTERNATOR 2 .
• Refer to REMOVING BOTH SOLENOID VALVES ON LEFT SIDE .
• Refer to REMOVING THE TOP TIMING CASE COVER OF CYLINDERS 7 TO 12 .

Courtesy of BMW OF NORTH AMERICA, INC.

• Turn the engine back in the opposite direction by 90° at the central bolt (1)  (see graphic).
• The piston (1)  of the chain tensioner must be pressed against the oil pressure in the housing (see arrow).
• Graphic N63.