Installing the timing chains

• Position the bottom timing chain (1).
• Position the crankshaft using special tool 2 357 904  and secure the special tool 2 357 904 with the screw (2).
• Make sure the special tool 2 357 904  is correctly installed on the guide pin of the crankshaft and on the guide bushing of the crankcase.

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• Insert the camshaft sprocket (2) into the timing chain and position it on the crankcase.
• Tighten down screw (1).
  TIGHTENING TORQUES SPECIFICATION
  
  

  Sprocket wheel at the crankcase
  Clean thread.	Tightening torque	108 Nm

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• Replace the bearing journals (1) and (3).

  Parts:  Bearing journal

• Position the guide rail (4) and screw in the bearing journals (3).
  TIGHTENING TORQUES SPECIFICATION
  
  

  Bearing journal to crankcase
  Replace bearing journal. Clean thread.	Tightening torque	20 Nm

• Position the tensioning rail (2) and screw in the bearing journal (1).
  TIGHTENING TORQUES SPECIFICATION
  
  

  Bearing journal to crankcase
  Replace bearing journal. Clean thread.	Tightening torque	20 Nm

  Courtesy of BMW OF NORTH AMERICA, INC.

• Remove oil and contamination from the sealing surfaces of the chain tensioner (2).
• Position the chain tensioner (2) and secure with the screws (1).
  TIGHTENING TORQUES SPECIFICATION
  
  

  Bottom chain tensioner to crankcase
  M6 x 22 Clean thread.	Tightening torque	9 Nm

  Courtesy of BMW OF NORTH AMERICA, INC.

• Secure the chain tensioner piston (1) with a screwdriver (2).
• Remove special tool 0 491 012 (11 4 120)  and slowly remove the screwdriver (2).
• Remove special tool 2 357 904. 

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

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• Install the chain (1) for the oil pump.

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work 

• Refer to INSTALLING THE REAR TIMING CASE COVER .
• Refer to REPLACING THE REAR CRANKSHAFT SEAL .
• Refer to INSTALLING THE OIL VACUUM PUMP .
• Refer to INSTALLING THE OIL SUMP .
• Refer to TIGHTENING THE OIL DRAIN PLUG .
• Refer to INSTALLING THE FLYWHEEL .
• Refer to CLEANING SEALING SURFACES .
• Refer to INSTALLING THE CYLINDER HEAD GASKET .
• Refer to INSTALLING THE CYLINDER HEAD .
• 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 INSTALLING THE INTAKE ADJUSTER .
• Refer to INSTALLING EXHAUST CAMSHAFT ADJUSTER .
• Refer to PRELOAD TIMING CHAIN .
• Refer to TIGHTENING THE VANOS CENTRAL VALVE .
• Refer to CRANKING ENGINE TWICE (AUTOMATIC TRANSMISSION) .
• Refer to DISASSEMBLING ALL SPECIAL TOOLS .
• Refer to INSTALLING THE COOLANT FEED LINE (COOLANT RETURN LINE IS REMOVED) .
• Refer to INSTALLING THE REAR SECTION OF THE COOLANT RETURN LINE (FRONT SECTION REMOVED) .
• Refer to INSTALLING THE FRONT SECTION OF THE COOLANT RETURN LINE .
• Refer to INSTALLING THE AUXILIARY COOLANT PUMP .
• Refer to INSTALLING THE INTAKE PLENUM .
• Refer to INSTALLING THE TANK VENT VALVE .
• Refer to TIGHTENING THE OIL FILTER CAP .
• Refer to SECURING THE OIL FEED LINE TO THE ENGINE BLOCK .
• Refer to INSTALLING THE OIL RETURNING LINE FOR THE EXHAUST TURBOCHARGER .
• Refer to INSTALLING THE SUPPORT FOR THE EXHAUST TURBOCHARGER .
• Refer to INSTALLING STARTER MOTOR .
• Refer to INSTALLING CYLINDER HEAD COVER .
• Refer to INSTALLING BOTH ACTUATORS (ENGINE REMOVED) .
• Refer to INSTALLING THE INJECTORS FOR THE CYLINDERS 4 TO 6 .
• Refer to INSTALLING THE INJECTORS FOR THE CYLINDERS 1 TO 3 .
• Refer to PREPARING FOR THE INSTALLATION OF THE HIGH PRESSURE PUMP .
• Refer to INSTALLING HIGH PRESSURE PUMP .
• Refer to INSTALLING THE HIGH-PRESSURE LINE BETWEEN THE HIGH-PRESSURE RAIL AND THE HIGH-PRESSURE PUMP .
• Refer to INSTALLING THE IGNITION COILS .
• Refer to INSTALLING FRONT ENGINE ENCAPSULATION .
• Refer to INSTALLING CHARGE AIR LINE .
• Refer to INSTALLING BOTTOM CLEAN AIR PIPE .
• Refer to INSTALLING FRONT AXLE DIFFERENTIAL .
• Refer to INSTALLING BEARING BRACKET .
• Refer to REMOVING THE ENGINE FROM THE ASSEMBLY JIG .
• Refer to TOPPING UP THE MOTOR OIL .
• Refer to INSTALLING CATALYTIC CONVERTER .
• Refer to INSTALLING THE OXYGEN SENSOR MONITOR .
• Refer to INSTALLING LAMBDA OXYGEN SENSOR .
• Refer to MOUNTING THE ENGINE ON THE FRONT AXLE .