Install both VANOS adjusters (cylinder head disassembly, bank 1)

Installing special tool for fixing camshafts on bank 1 (VANOS disassembled) 

• Position the special tool 2 249 117 (1) on the camshafts of cylinder bank 1.
• Twist camshafts if necessary.
• Place the special tool 2 249 117 using two screws from cylinder head cover (2) so that it sets against the cylinder head.

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• The installation position of the VANOS adjusters must be observed in every case.

  IN is the intake adjuster (1).

  EX is the exhaust camshaft adjuster (2).

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• Replacement:  Replace VANOS adjusters (1).

  Parts:  VANOS adjusters

• Thread VANOS adjusters (1) in and position.

  The VANOS adjusters (1) must lie flat on the camshafts. 

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• Position VANOS central valves (1).
• Tighten VANOS central valves (1) until they make contact.

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  Installing the slide rail of cylinder bank 1 (removal/installation/replacement of VANOS adjuster) 

• Position the slide rail (3) of the cylinder bank 1.
• Tighten down screw (2).
  TIGHTENING TORQUE SPECIFICATION
  
  

  Flat-head screw to the slide rail
  Flat-head screw M6x67	Tightening torque	10 Nm

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• Tighten down screw (1).
  TIGHTENING TORQUE SPECIFICATION
  
  

  Collar screw to the slide rail
  Collar screw M6x48	Tightening torque	10 Nm

  Preloading the timing chain of cylinder bank 1 

  NOTE: RISK OF DAMAGE 
  Damage to timing chain or timing chain drive. 
  Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive. 

  • Always turn the engine with the chain tensioner or the special tool.
• Hand-tighten the bolts (1).
• Pre-tension timing chain on special tool 2 249 162 at hexagon screw (2) with special tool 0 496 778 (00 9 460) to 0.6 Nm.
  TIGHTENING TORQUE SPECIFICATION
  
  

  Preload timing chain
  tightening torque	0.6 Nm

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• Make straight marks on the VANOS central valves (1) and the VANOS adjusters (2) in the area of the hexagon head.

  The angle must be 60°. 

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• Release the VANOS central valves (1) in the area of the hexagon head in a counterclockwise direction until the upper mark of the VANOS central valve matches with the lower mark.

  The rotational angle is 60°. 

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• Turn the engine counter-clockwise by 90° at central bolt.

  Mate sure that the special tools  (1) 0 493 882 (11 9 190) and  0 496 366 (11 8 570)  (2) do not collide with other components. 

• Remove the special tool 0 496 366 (11 8 570) (2).

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• Position the special tool (1) 0 493 882 (11 9190)  in the recess on the engine block.
• Turn the engine on the central bolt clockwise until the special tool 0 493 882 (11 9 190) (1) lies against special tool 0 496 366 (11 8 570) (2).
• Tighten special tool 0 496 366 (11 8 570) (2) hand-tight to the vibration absorber with a screw of the belt pulley (3).
• Remove the special tool (1) 0 493 882 (11 9190). 

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  Checking the preload of the timing chain for cylinder bank 1 

  NOTE: RISK OF DAMAGE 
  Damage to timing chain or timing chain drive. 
  Turning the engine without chain tensioner or special tool can result in damage to the timing chain and timing chain drive. 

  • Always turn the engine with the chain tensioner or the special tool.
• Check whether the screws (1) have been hand-tightened.
• Check preload of timing chain on special tool 2 249 162 at hexagon screw (2) with special tool 0 496 778 (00 9 460) to 0.6 Nm.
  TIGHTENING TORQUE SPECIFICATION
  
  

  Preload timing chain
  tightening torque	0.6 Nm

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• Tighten VANOS central valves (1).
  TIGHTENING TORQUE SPECIFICATION
  
  

  VANOS central valve initial torque
  VANOS central valve	Joining torque	5 Nm

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• Turn engine on the central bolt until the special tool is aligned with the struts on the engine block.
• The special tool 0 496 366 (11 8 570) (3) must be fastened to the vibration absorber with a screw from the belt pulley (2).
• Slide the crankshaft in the installation position with the special tool 0 493 882 (11 9 190) (1) on the bars and fix it.

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• Tighten VANOS central valves (1).
  TIGHTENING TORQUE SPECIFICATION
  
  

  VANOS central valve second tightening
  VANOS central valve	Snug torque 1	30 Nm
  	Snug torque 2	50 Nm

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• Position special tool 0 490 504 (00 9 120) (1) on the VANOS central intake valve.

  The magnetic foot of the special tool 0 490 504 (00 9 120) must be attached to a magnetic component in the engine compartment.

• The flexible element of the special tool 0 490 504 (00 9 120) (1) may not collide with other components.

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• Set the angle of rotation on the special tool 0 490 504 (00 9 120) to zero.

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• Tighten VANOS central intake valve until the needle on the special tool 0 490 504 (00 9 120) is at 30°.
  TIGHTENING TORQUE SPECIFICATION
  
  

  VANOS central valve third tightening
  VANOS central valve	Angle of rotation	30°

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• Position special tool 0 490 504 (00 9 120) (1) on the VANOS exhaust central valve.

  The magnetic foot of the special tool 0 490 504 (00 9 120) must be attached to a magnetic component in the engine compartment.

• The flexible element of the special tool 0 490 504 (00 9 120) (1) may not collide with other components.

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• Set the angle of rotation on the special tool 0 490 504 (00 9 120) to zero.

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• Tighten VANOS central intake valve until the needle on the special tool 0 490 504 (00 9 120) is at 30°.
  TIGHTENING TORQUE SPECIFICATION
  
  

  VANOS central valve third tightening
  VANOS central valve	Angle of rotation	30°

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  Install the sealing cap on the cylinder head of cylinder bank 1 

• Replace the seal (1).

  Parts:  Seal

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• Position the sealing cap (2) on the cylinder head.
• Tighten down screws (1).
  TIGHTENING TORQUE SPECIFICATION
  
  

  Timing case cover on cylinder head
  M6x20 screw	Tightening torque	9.5 Nm

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