Adjusting the valve timing of cylinder bank 1

Preliminary work 

• Refer to CHECKING CAMSHAFT TIMING .

• Turn the engine clockwise on the central bolt until the installation position (MP) (1) of the vibration absorber aligns with the marks of the engine block.

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• Check the camshaft positions of bank 1.

  The cams (1) must be in the position shown.

  The increment wheels (2) must form a line to the exhaust camshaft bearing cap and to the intake camshaft bearing cap.

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  NOTE: Description is for right component only. The procedure on the left side is identical.
  NOTE: To provide a better overview: Schematic diagram with partially hidden components.
• Make sure that the ground surfaces (2) of the camshafts point up.

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• Make sure that the rounded surfaces (1) point downwards to the cylinder head.
• Check and evaluate the timing once again.
• Release screws (1) on the special tool 2 249 137  from the set of special tools 2 249 117  .
• Remove the special tool 2 249 140  (2).

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• Make sure that the VANOS central valves may only be secured with the special tools from the set of special tools 2 249 117. 
• Rotate the engine on the central bolt until the special tool 2 249 137  (2) can be positioned on the intake camshaft.
• Tighten special tool 2 249 137  (2) with screws (3) of the cylinder head covers.
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  SWZ2249117
  Screw M6	Tightening torque	10 Nm

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• Slacken the VANOS central valve (1).

  Do not completely unscrew the VANOS central valve  (1).

  Manually bring the VANOS central valve (1) onto the contact surface.

• Rotate the engine on the central bolt until the special tool (1) 2 249 140  can be positioned on the exhaust camshaft.

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• Tighten the screws (1) on the special tool 2 249 140  from the set of special tools 2 249 117  .
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  SWZ2249117
  Screw M6	Tightening torque	10 Nm

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• Make sure that the VANOS central valves may only be secured with the special tools from the set of special tools 2 249 117. 

  The special tool 2 249 117  (2) must be secured with screws (3) of the cylinder head cover.

• Slacken the VANOS central valve (1).

  Do not completely unscrew the VANOS central valve  (1).

• Manually bring the VANOS central valve (1) onto the contact surface.

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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 an anti-clockwise 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.

  Make 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 9 190)  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 special tool (1) 0 493 882 (11 9 190)  .

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  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 that the screws (1) have been hand-tightened.

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• 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 SPECIFICATIONS
  
  

  Preload timing chain
  tightening torque		0.6 Nm

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

  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.
• Attach the special tool 0 496 366 (11 8 570)  (3) with a screw (2) of the belt pulley on the vibration absorber.
• 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 SPECIFICATIONS
  
  

  VANOS central valve second tightening
  VANOS central valve	Joining torque	30 Nm
  	Joining torque	50 Nm

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

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

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

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

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

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

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

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

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• Loosen screws (2).
• Remove the special tool 2 249 117  (1).

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• Remove special tool 0 493 882 (11 9 190)  (1).
• Release the screw (2) of the belt pulley.
• Remove special tool 0 496 366 (11 8 570)  (3).

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• Check the camshaft positions of bank 1.

  Cams (1) must be in the position shown.

  The increment wheels (2) must form a line to the exhaust camshaft bearing cap and to the intake camshaft bearing cap.

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  NOTE: Description is for right component only. The procedure on the left side is identical.
  NOTE: To provide a better overview: Schematic diagram with partially hidden components.

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• Make sure that the ground surfaces (2) of the camshafts point up.
• Make sure that the rounded surfaces (1) point downwards to the cylinder head.
• Check and evaluate the timing once again.
• Crank the engine on the central bolt twice  in a clockwise direction until the installation position (MP) (1) of the vibration absorber aligns with the marks of the engine block.

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• Position special tool 0 496 366 (11 8 570)  (3) on the vibration absorber.
• Position the special tool 0 493 882 (11 9 190)  (1) in the special tool 0 496 366 (11 8 570)  (3).

  The special tool 0 493 882 (11 9 190)  (1) must not be inserted very far as the special tool 0 493 882 (11 9 190)  (1) may collide with other components while  turning the crankshaft.

• Rotate the engine on the central bolt in direction of engine rotation until the special tool aligns with the engine block marks.
• Tighten special tool 0 496 366 (11 8 570)  (3) hand-tight to the vibration absorber with a screw of the belt pulley (2).
• Slide the crankshaft in the installation position with the special tool 0 493 882 (11 9 190)  (1) at the marks and fix it.

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  Check 

• Position special tool 2 249 117  (1) on the camshafts of cylinder bank 1.
• Check whether the camshafts can be fixed with the special tool 2 249 117  (1).
• Check whether the special tool 2 249 117  (1) can be brought onto the contact surface for the cylinder head with 2 screws (2) of the cylinder head cover.

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  Result 

  » The camshafts can be fastened.

  Measure

  • Valve timings are OK 

  Loosen screws (2).

  Remove the special tool 2 249 117  (1).

  Continue the repair in the next step.

  Result 

  » The camshafts cannot be fastened.

  Measure

  • Adjust the timings of cylinder bank 1.
• Remove special tool 0 493 882 (11 9 190)  (1).
• Release the screw (2) of the belt pulley.
• Remove special tool 0 496 366 (11 8 570)  (3).

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  Installing the special tool to secure the camshafts of cylinder bank 1 

  NOTE: TECHNICAL INFORMATION 
  If the check finds that the valve timings are incorrect, they must be adjusted.

  Check 

• Position special tool 2 249 117  (1) on the camshafts of cylinder bank 1.
• Check if the camshafts can be fastened with the special tool 2 249 117  (1).
• Check if the special tool 2 249 117  can be brought in contact with the cylinder head using the two screws of the cylinder head cover (2).

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  Result 

  » The camshafts can be fastened.

  Measure

  • Timings are OK. 

    Loosen screws (2).

    Remove the special tool 2 249 117  (1).

    Continue the repair in the next step.

  Result 

  » The camshafts cannot be fastened.

  Measure

  • Adjust the timings of cylinder bank 1.

  Removing the special tool to pretension the timing chain at 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.
• Release timing chain on the special tool 2 249 162 by turning the hexagon screw (2). 
• Release the special tool 2 249 162  in the areas (1) and remove it.

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  Installing the hydraulic chain tensioner 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.
• Feed in and position the hydraulic chain tensioner (2).
• Tighten the screws (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Chain tensioner to cylinder head
  screw	Tightening torque	13 Nm

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• Remove the special tool 0 491 012 (11 4 120)  or transportation retainer (3) from the bore.

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  Removing special tool for fixing camshafts on bank 1 

• Loosen screws (2).
• Remove the special tool 2 249 117  (1).

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  Remove the special tools to disconnect the crankshaft 

• Remove special tool 0 493 882 (11 9 190)  (1).
• Release the screw (2) of the belt pulley.
• Remove special tool 0 496 366 (11 8 570)  (3).

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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 SPECIFICATIONS
  
  

  Sealing cap to cylinder head
  M6x20 screw	Tightening torque	9.5 Nm

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