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 RIGHT INTAKE SILENCER HOUSING .
• Refer to REMOVING RIGHT AIR DUCT .
• Refer to REMOVING LEFT INTAKE SILENCER HOUSING .
• Refer to REMOVING THE LEFT-HAND AIR DUCT .
• Refer to REMOVING LEFT INTAKE PORT .
• Refer to REMOVING THE REAR TOP CROSS CONNECTION .
• Refer to REMOVING FAN COWL .
• 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 THROTTLE VALVE ASSEMBLY .
• Refer to PARTIALLY LOOSENING THE LEFT-HAND CHARGE AIR COOLER .
• Refer to REMOVING THE RIGHT THROTTLE BODY .
• Refer to PARTIALLY LOOSENING THE RIGHT-HAND CHARGE AIR COOLER .
• 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 RIGHT-HAND VENTILATION LINE .
• Refer to REMOVING IGNITION COILS .
• Refer to REMOVING COVER FOR THE RIGHT DME CONTROL UNIT .
• Refer to DISCONNECTING ALL CONNECTORS FROM THE DME CONTROL UNIT FOR CYLINDERS 1 TO 6 AND FROM THE INTEGRATED POWER SUPPLY MODULE (PDM) .
• Refer to PARTIALLY RELEASING THE WIRING HARNESS FROM RIGHT CYLINDER HEAD COVER .
• Refer to REMOVING TOP RIGHT CLEAN AIR PIPE .
• Refer to REMOVING RIGHT CHARGE AIR PIPE .
• Refer to REMOVING THE RIGHT HIGH-PRESSURE LINE BETWEEN THE HIGH-PRESSURE PUMP AND THE HIGH-PRESSURE RAIL .
• Refer to REMOVING FUEL DELIVERY LINE .
• Refer to REMOVING ALL HIGH PRESSURE LINES BETWEEN RAIL AND INJECTORS .
• Refer to REMOVING RIGHT RAIL .
• Refer to REMOVING RIGHT 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 DRAINING COOLANT .
• Refer to RELEASING COOLANT FEED LINE FOR THE RIGHT EXHAUST TURBOCHARGER .
• Refer to REMOVING RIGHT CYLINDER HEAD COVER .
• Refer to REMOVING THE COOLANT EXPANSION TANK FOR THE LOW-TEMPERATURE COOLANT CIRCUIT .
• Refer to REMOVING BOTH SOLENOID VALVES ON RIGHT SIDE .
• Refer to REMOVING THE TOP TIMING CASE COVER FOR CYLINDERS 1 TO 6 .

• 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.

Courtesy of BMW OF NORTH AMERICA, INC.