Remove timing chains

Preliminary work 

• Refer to REMOVING THE FRONT AXLE COMPLETELY WITH THE ENGINE AND TRANSMISSION .
• Refer to REMOVING THE ENGINE FROM THE FRONT AXLE .
• Refer to REMOVING THE LAMBDA OXYGEN SENSOR .
• Refer to REMOVING THE OXYGEN SENSOR MONITOR
• Refer to REMOVING CATALYTIC CONVERTER .
• Refer to REMOVING THE RIGHT ENGINE MOUNT HOLDER .
• Refer to PREPARING THE ASSEMBLY JIG .
• Refer to INSTALLING THE ENGINE ON THE ASSEMBLY JIG .
• Refer to REMOVING BEARING BRACKET .
• Refer to REMOVING FRONT AXLE DIFFERENTIAL .
• Refer to DRAINING THE MOTOR OIL .
• Refer to REMOVING BOTTOM CLEAN AIR PIPE .
• Refer to REMOVING CHARGE AIR LINE .
• Refer to REMOVING TANK VENT VALVE .
• Refer to REMOVING THE INTAKE PLENUM .
• Refer to REMOVING BOTH ACTUATORS (ENGINE REMOVED)
• Refer to REMOVING FRONT ENGINE ENCAPSULATION .
• Refer to REMOVING IGNITION COILS .
• Refer to REMOVING THE HIGH PRESSURE LINE BETWEEN THE RAIL AND THE HIGH PRESSURE PUMP .
• Refer to REMOVING HIGH PRESSURE PUMP .
• Refer to REMOVING THE INJECTORS FOR CYLINDERS 1 TO 3 .
• Refer to REMOVING THE INJECTORS FOR CYLINDERS 4 TO 6 .
• Refer to REMOVING THE CYLINDER HEAD COVER .
• Refer to DETACHING OIL SUPPLY LINE FROM THE ENGINE BLOCK .
• Refer to REMOVING THE OIL RETURN LINE FOR THE EXHAUST TURBOCHARGER .
• Refer to REMOVING THE EXHAUST TURBOCHARGER SUPPORT .
• Refer to REMOVING STARTER MOTOR .
• Refer to TURNING THE ENGINE ON THE VIBRATION DAMPER .
• Refer to BLOCKING THE CRANKSHAFT IN THE TDC FIRING POSITION OF THE FIRST CYLINDER (AUTOMATIC TRANSMISSION) .
• Refer to BLOCKING THE CAMSHAFTS
• Refer to REMOVING CHAIN TENSIONER .
• Refer to RELEASING THE VANOS CENTRAL VALVE .
• Refer to REMOVING INTAKE ADJUSTER .
• Refer to REMOVING EXHAUST CAMSHAFT ADJUSTER .
• Refer to DISASSEMBLING THE SPECIAL TOOL 2 358 122 .
• Refer to REMOVING THE AUXILIARY COOLANT PUMP .
• Refer to REMOVING THE FRONT SECTION OF THE COOLANT RETURN LINE .
• Refer to REMOVING THE REAR SECTION OF THE COOLANT RETURN LINE (FRONT SECTION IS REMOVED) .
• Refer to REMOVING THE COOLANT FEED LINE (COOLANT RETURN LINE IS REMOVED) .
• Refer to REMOVING CYLINDER HEAD .
• Refer to REMOVING THE CYLINDER HEAD GASKET .
• Refer to SEALING THE OIL DUCT .
• Refer to REMOVING FLYWHEEL .
• Refer to REMOVING THE MAGNET WHEEL .
• Refer to REMOVING OIL SUMP .
• Refer to REMOVING THE OIL VACUUM PUMP .
• Refer to REMOVING REAR TIMING CASE COVER .

• Remove the chain (1).

  Courtesy of BMW OF NORTH AMERICA, INC.

• Remove the top timing chain (1) and the tensioning rail (2).

  Courtesy of BMW OF NORTH AMERICA, INC.

• Press in the chain tensioner piston (1) using a screwdriver (2) up to the stop and secure using special tool 0 491 012 (11 4 120)  .

  Courtesy of BMW OF NORTH AMERICA, INC.

• Loosen the screws (1) and remove the chain tensioner (2).

  Courtesy of BMW OF NORTH AMERICA, INC.

• Loosen the bearing journal (1) and remove the tensioning rail (2).
• Loosen the bearing journal (3) and remove the guide rail (4).

  Courtesy of BMW OF NORTH AMERICA, INC.

• Release the screw (1) and remove the camshaft sprocket (2).
• Remove the bottom timing chain.

Courtesy of BMW OF NORTH AMERICA, INC.