Installing the exhaust camshaft for cylinders 7 to 12

Exhaust camshaft, left 

Fig 1: Exhaust Camshaft Screws Tightening Sequence

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1-14 Screws (graphic N74) 

• Check the plain rectangular compression rings (1) on the exhaust camshaft for damage, replace if necessary.

  The snap-in lugs (arrows) of the plain rectangular compression ring must be locked in place.

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• Ensure a correct fit of the roller cam follower (1).
• Coat all bearing positions of the exhaust camshaft on the cylinder head with engine oil.

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• Observe the camshaft identification.

  All camshafts are identified and must never be mixed up.

  A = Exhaust side, 712 = Cylinders 7 to 12

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• Coat all bearing positions with motor oil.
• Insert exhaust camshaft without tension so that the identification is legible.
• Observe the correct installation orientation of the roller cam follower (arrows).

  The cams on cylinder 7 must point outwards.

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• Make sure that the thrust bearing of the exhaust camshaft (1) is positioned correctly in the cylinder head.

  The exhaust camshaft bearing cap of the thrust bearing (1) can only be mounted in one position.

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• Coat all bearing positions with motor oil.
• Observe the identification of the camshaft bearing caps.

  All camshaft bearing cups are marked and must never be mixed up.

  L = Cylinders 7 to 12, A = Exhaust side, 4 = Bearing position 4

  R = Cylinder 1 to 6, E = Intake side

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• Position all exhaust camshaft bearing caps (2) at their original installation location and tighten the screws by hand.
• Position the lid (1) of the thrust bearing on the thrust bearing and hand-tighten the screws.

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• Insert special tool 0 496 381 (11 9 893)  .

  The special tool 0 496 381 (11 9 893)  must lie flush on the cylinder head after positioning the exhaust camshaft.

• If necessary, slightly twist the exhaust camshaft.

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• Tighten the screws in the sequence (14) to (1) in steps of 180° with the snug torque.
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Camshaft bearing cap to cylinder head
  M7x45	Joining torque	15 Nm
  M7x45	Tightening torque	15 Nm

• Make sure that all the exhaust camshaft bearing caps lie on the cylinder head without gaps.
• Tighten the screws in the sequence (14) to (1) with the tightening torque.
  Fig 2: Exhaust Camshaft Screws Tightening Sequence

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  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Camshaft bearing cap to cylinder head
  M7x45	Joining torque	15 Nm
  M7x45	Tightening torque	15 Nm