Install both timing chains

• Position the timing chain (1).
• Position the special tool 2 357 904  on the guide pin (arrow) of the crankshaft and secure it with the bolt (2) on the crankcase.

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• Replace the bearing journals (1) and (4).

  Parts:  Bearing journal

• Clean all of the screw threads of the bearing journals. Use a thread cutter as needed.
• Install the camshaft sprocket and hand-tighten the bolt.
• Position the guide rail (2).
• Screw in and tighten both bearing journals (1).
  TIGHTENING TORQUES SPECIFICATION
  
  

  Bearing journal of tensioning and guide rail
  M8	Tightening torque	20 Nm

• Position tensioning rail (3).
• Screw in and tighten the bearing journals (4).

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  TIGHTENING TORQUES SPECIFICATION
  
  

  Bearing journal of tensioning and guide rail
  M8	Tightening torque	20 Nm

• (1) Clean sealing surfaces.

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• Install the chain tensioner and tighten the bolts (1).
  TIGHTENING TORQUES SPECIFICATION
  
  

  Chain tensioner to crankcase
  M6x22	Tightening torque	10 Nm

• Secure the chain tensioner piston (3) with the screwdriver (2).
• Remove special tool 0 491 012 (11 4 120)  and slowly remove the screwdriver (2).

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• Replace the screw (1).

  Parts:  Screw

• Tighten down screw (1).
  TIGHTENING TORQUES SPECIFICATION
  
  

  Camshaft sprocket with bearing to crankcase
  M12x1.5	Tightening torque	108 Nm

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• Mount the tensioning rail (2) on the bearing journal (3).
• Attach the timing chain (1) on the camshaft sprocket and position it correctly on the tensioning rail (2).

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• Mount the drive chain (1) on the crankshaft.

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Follow-up Work 

• Refer to INSTALLING THE OIL VACUUM PUMP .
• Refer to INSTALLING THE REAR TIMING CASE COVER .
• Refer to REFITTING SUMP .
• Refer to INSTALLING THE FLYWHEEL .
• Refer to SEALING THE OIL DUCT .
• Refer to CLEANING SEALING SURFACES .
• Refer to INSTALLING THE CYLINDER HEAD .
• Refer to ATTACHING THE OIL RETURN LINE FOR THE EXHAUST TURBOCHARGER .
• Refer to BLOCKING THE CRANKSHAFT IN HE TDC FIRING POSITION OF CYLINDER 1 .
• Refer to BLOCKING THE CAMSHAFTS .
• Refer to INSTALLING THE INTAKE ADJUSTER .
• Refer to INSTALLING VANOS CENTRAL VALVE OF THE INTAKE SIDE .
• Refer to INSTALLING EXHAUST CAMSHAFT ADJUSTER .
• Refer to INSTALLING VANOS CENTRAL VALVE OF THE EXHAUST SIDE .
• Refer to PRELOAD TIMING CHAIN .
• Refer to TIGHTENING THE VANOS CENTRAL VALVE .
• Refer to DISASSEMBLING ALL SPECIAL TOOLS .
• Refer to CHECKING CAMSHAFT TIMING .
• Refer to INSTALLING THE THERMOSTAT ON THE TRANSMISSION OIL LINES .
• Refer to INSTALLING THE STARTER MOTOR (ACOUSTIC COVER REMOVED) .
• Refer to INSTALLING THE ACOUSTIC COVER FOR THE OIL SUMP .
• Refer to INSTALLING THE CYLINDER HEAD COVER (ENGINE REMOVED) .
• Refer to INSTALLING BOTH ACTUATORS (ENGINE REMOVED) .
• Refer to PREPARING FOR THE INSTALLATION OF THE HIGH PRESSURE PUMP .
• Refer to INSTALLING HIGH PRESSURE PUMP .
• Refer to PREPARING THE INJECTORS FOR INSTALLATION .
• Refer to INSTALLING INJECTORS .
• Refer to INSTALLING THE HIGH-PRESSURE LINE BETWEEN THE HIGH-PRESSURE PUMP AND THE HIGH-PRESSURE RAIL .
• Refer to INSTALLING THE IGNITION COILS .
• Refer to INSTALLING THE INTAKE PLENUM .
• Refer to INSTALLING THE TANK VENTING VALVE .
• Refer to INSTALLING OIL FEED LINE FOR EXHAUST TURBOCHARGER (ENGINE ENCAPSULATION REMOVED) .
• Refer to INSTALLING FRONT ENGINE ENCAPSULATION .
• Refer to INSTALLING THE COOLANT FEED LINE FOR THE EXHAUST TURBOCHARGER (COOLANT RETURN LINE REMOVED) .
• Refer to INSTALLING THE COOLANT RETURN LINE FOR THE EXHAUST TURBOCHARGER (AUXILIARY COOLANT PUMP REMOVED) .
• Refer to INSTALLING AUXILIARY COOLANT PUMP FOR THE EXHAUST TURBOCHARGER .
• Refer to TOPPING UP THE MOTOR OIL .
• Refer to REMOVING ENGINE FROM ASSEMBLY STAND .