Adjust the timing of the camshaft

Preliminary work 

• Refer to BLOCKING THE CRANKSHAFT IN THE TDC FIRING POSITION OF CYLINDER 1 .
• Refer to REMOVING RIGHT FRONT-END STRUT .
• Refer to REMOVING INTAKE SILENCER HOUSING .
• Refer to REMOVING CHAIN TENSIONER .

Precondition 

Crankshaft is disconnected and blocked.

Engine is in TDC firing position of cylinder 1.

• Get the set of special tools 2 456 372 ready.

  Number	Description
  1	Basic carrier
  2	Setting gauge 0.7° for adjusting the intake camshaft
  3	Setting gauge 0.5° for adjusting the exhaust camshaft
  4	Basic carrier screws on cylinder head
  5	Screw gauge on basic carrier

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• Use the setting gauge 0.7° (1) from the special tool kit 2 456 372 to adjust the intake camshaft.
• Use the setting gauge 0.5° (2) from the special tool kit 2 456 372 to adjust the exhaust camshaft.

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• To release the VANOS central valve (1), use the reversible ratchet (2) from the special tool 0 496 855 with the special tool 2 450 487 .

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• Position the basic carrier (1) from the set of special tools 2 456 372 on the cylinder head.

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• Tighten the screws (1) from special tool set  2 456 372  on the basic carrier (2)  .
  TIGHTENING TORQUE SPECIFICATION
  
  

  Basic carrier to cylinder head
  M6	Tightening torque	8 Nm

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• Position the setting gauge 0.7° (1) from the special tool kit 2 456 372 between the basic carrier (2) from the set of special tools 2 456 372 and the intake camshaft (3).
• If necessary, crank the engine at the crankshaft using special tool 0 493 380 (11 6 480) .
• Tighten the screws (4) from special tool set  2 456 372  .
  TIGHTENING TORQUE SPECIFICATION
  
  

  Test gauge to basic carrier
  M6	Tightening torque	8 Nm

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• Release the VANOS central valve (5) of the intake adjuster.
• Position the setting gauge 0.5° (1) from the special tool kit 2 456 372 between the basic carrier (2) from the set of special tools 2 456 372 and the exhaust camshaft (3).
• If necessary, crank the engine at the crankshaft using special tool 0 493 380 (11 6 480) .
• Tighten the screws (4) from special tool set  2 456 372  .
  TIGHTENING TORQUE SPECIFICATION
  
  

  Test gauge to basic carrier
  M6	Tightening torque	8 Nm

• Release the VANOS central valve (5) of the exhaust camshaft adjuster.

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• Make sure the flattened areas (1) on the intake camshaft and the exhaust camshaft are pointing upwards at an angle.

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• Rotate the intake camshaft (E) and the exhaust camshaft (A) so that the marks (1) are legible from above.

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• Make sure the cam (1) on the exhaust camshaft on cylinder 1  is pointing slightly to the inside right at an angle.

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• Make sure the cam (1) on the intake camshaft on cylinder 1  is pointing leftwards at an angle.

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