Check the timing of cylinder bank 1

• Turn the engine at the central bolt in clockwise direction until the installation position (MP) (1)  of the vibration absorber (1)  is positioned flush with the marks of the engine block.

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• Check the camshaft positions of cylinder bank 1.

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

  The increment wheels (2)  should each form a straight line with the exhaust camshaft bearing cap and 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 of the camshafts (1)  point upward.
• Take care that the rounded surfaces (1)  point down to the cylinder head.
• Check timing again and assess.

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Relieving the chain tensioner at cylinder bank 1 for checking or setting the valve timings 

• Make sure that the chain drive is loaded at the same time on the central bolt of the engine and on the VANOS central valve on the exhaust  .

  The movement of the chain tensioner piston must be observed in this process.

  To do this, the following steps must be carried out at the same time:

• Keep the VANOS central valve on the exhaust under tension in clockwise direction with a support person.

  The VANOS central valve on the exhaust must not be twisted.

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• Turn engine counter clockwise at central bolt (1)  .

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Slackening the hydraulic chain tensioner of cylinder bank 1 

• Position the special tool 0 491 012 (11 4 120) (3)  in the bore and fasten the chain tensioner piston.

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• Make sure that the chain drive is relieved at the same time on the central bolt of the engine and on the VANOS central valve on the exhaust  . To do this, carry out the following steps at the same time:
• Relieve the chain drive clockwise at the central bolt.

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• Relieve the chain drive counterclockwise at the VANOS central valve on the exhaust.

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• Loosen screws (1)  .
• Feed out and remove hydraulic chain tensioner (2)  .

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• Unscrew the screw (2) until the special tool 2 249 162 is slackened  .
• Position the special tool 2 249 162  on the cylinder head and apply the screws (1)  hand-tight.
• 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 SPECIFICATIONS
  
  

  Preload timing chain
  	tightening torque	0.6 Nm

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• Position special tool 0 496 366 (11 8 570) (3)  on the vibration absorber.
• Position special tool 0 493 882 (11 9 190) (1)  in special tool 0 496 366 (11 8 570)  .
  NOTE: Do not slide the special tool 0 493 882 (11 9 190) (2) too far in; otherwise, it will collide with other  components when the crankshaft is turning.
• Position reversible ratchet.
• Rotate the engine on the central bolt clockwise until the special tool lines up with the engine block marks.
• Attach the special tool 0 496 366 (11 8 570) (3)  to the vibration absorber with a screw from the belt pulley (2)  and hand-tighten.
• With the crankshaft in the installation position, use the special tool 0 493 882 (11 9 190) (1)  to insert it onto the marks and fasten.

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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 of the camshafts (1)  point upward.
• Take care that the rounded surfaces (1)  point down to the cylinder head.
• Check timing again and assess.

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Check 

• Check the camshaft positions of cylinder bank 1.

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

  The increment wheels (2)  must be flush with the exhaust camshaft bearing cap and the intake camshaft bearing cap.

  The ground surfaces of the camshaft must face up.

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Result 

Camshaft position is correct.

Measure

• Continue the repair with the next step.

Result 

Camshaft position is not correct.

Measure

• Disassemble special tools 0 496 366 (11 8 570)  and 0 493 882 (11 9 190)  and remove.

Measure

• Turn engine at the central bolt of the crankshaft by 360° until the installation position (MP) of the vibration absorber is positioned flush with the marks of the engine block.

Measure

• Re-secure the engine in TDC setting with special tools 0 496 366 (11 8 570) and 0 493 882 (11 9 190)  .

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

• 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.

See ADJUSTING CAMSHAFT TIMING ON RIGHT SIDE .

• Release timing chain on the special tool 2 249 162  by turning the hexagon screw (2)  .
• Release special tool 2 249 162  in area (1)  and remove.

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• Feed in and position the hydraulic chain tensioner (2)  .
• Tighten down 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) (3)  .

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