Checking cylinder head for watertightness

Precondition 

All valves are removed

• Release venting connector (2)  .
• Position special tool 0 496 409 (11 8 081) on cylinder head.
• The rubber layer (marked yellow) on the special tool 0 496 409 (11 8 081) must point to the cylinder head.
• The fixed side of the special tool  0 496 409 (11 8 081)  must point downwards. 

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• For attaching the special tool 0 496 409 (11 8 081) , it is mandatory  to use the cylinder head bolt washers (1)  .
• Fasten the special tool 0 496 409 (11 8 081) (2)  with the screws from the set of special tools  0 496 408 (11 8 080)  (3)  .

  Observe the following tightening sequence. 

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• Tighten the screws in the sequence (1)  to (10)  .
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Cylinder head to special tool
  screw	Tightening torque	25 Nm

  Fig 1: Cylinder Head Screws Tightening Sequence

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• Position the valve (1) from the set of special tools  0 496 408 (11 8 080)  on the cylinder head and  tighten.
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Valve in cylinder head
  valve	Tightening torque	0.8 Nm

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• Apply 3 bar of pressure (2)  to the valve (1)  .
• Immerse the cylinder head in a water bath and check for leakage.

  The water bath can be made easier with standard dish soap.

  The formation of blisters indicate faults or cracks on the cylinder head. 

• Relieve the pressure on the valve (1)  with a tire pressure gauge (2)  .
• Disassemble the valve (1)  from the set of special tools 0 496 410 (11 8 082) .

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• Release the screws of the device (1)  .
• Remove the device (1)  .
• Replace the venting connector (2)  .

  Parts:  Venting connector

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• Tighten the venting connector (2)  .
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Venting connector/special tool to cylinder head
  M8x1 Replace the venting connector.	Tightening torque	15 Nm

• Dry all openings on the cylinder head with compressed air.
• Coat the bearing positions of the camshaft with motor oil.