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.

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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.
• 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.
• 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

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• 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	Snug torque 1	30 Nm
  	Snug torque 2	50 Nm

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

Check 

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• 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 

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 

• 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 

• 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).

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

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