Checking cylinder head for watertightness

Preliminary work 

• Refer to REMOVING THE EXHAUST TURBOCHARGER (CYLINDER HEAD REMOVED) .
• Refer to MOUNTING THE CYLINDER HEAD ON THE ASSEMBLY JIG .
• Refer to ADJUSTING THE ECCENTRIC SHAFT TO THE MINIMUM LIFT (CYLINDER HEAD REMOVED) .
• Refer to REMOVING THE TORSION SPRINGS (CYLINDER HEAD REMOVED) .
• Refer to REMOVING ALL GATES .
• Refer to REMOVING ALL INTERMEDIATE LEVERS .
• Refer to REMOVING THE INTAKE CAMSHAFT (CYLINDER HEAD REMOVED) .
• Refer to REMOVE THE SERVOMOTOR FOR THE ECCENTRIC SHAFT (CYLINDER HEAD REMOVED) .
• Refer to REMOVING THE ECCENTRIC SHAFT (CYLINDER HEAD REMOVED) .
• Refer to REMOVING THE EXHAUST CAMSHAFT (CYLINDER HEAD REMOVED) .
• Refer to REMOVE ALL ROLLER CAM FOLLOWERS .
• Refer to REMOVING ALL HYDRAULIC VALVE CLEARANCE COMPENSATING ELEMENTS  .
• Refer to REMOVE ALL VALVE SPRINGS .
• Refer to REMOVE VALVE STEM SEALS .
• Refer to REMOVE ALL VALVES .

• Get the set of special tools 2 361 215 ready.

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• Have the special tool 2 456 190 ready.

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• Position the cylinder head (1) on the special tool 2 361 215 so that the rubber layer faces the cylinder head (1) and all water ducts at the cylinder head (1) are closed.

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• Feed in the screws (1) to (14) on the cylinder head (A).
• Tighten screws in the order (1) to (14).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Cylinder head to special tool  2 361 215
  	tightening torque 35 Nm

  Fig 1: Cylinder Head Screws Tightening Sequence

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• Insert and install the special tool 2 456 190 at the cylinder head (2).
• Tighten down screws (2).
  NOTE: Use screws of the coolant line between the cylinder head and the coolant pump.
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  special tool 2 456 190 to cylinder head
  M6X20	Tightening torque	8 Nm

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• Release venting connector (1).
• Feed out and remove venting connector (1).

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• Mount the valve of the special tool 2 361 215 on the cylinder head.

Venting connector/special tool to cylinder head
M10	tightening torque 18 Nm

Courtesy of BMW OF NORTH AMERICA, INC.

Check 

• Heat up the cylinder head.
  TECHNICAL DATA SPECIFICATIONS
  
  

  Check for cylinder head watertightness
  	Temperature of the cylinder head	60°C

• Connect compressed air.
  TECHNICAL DATA SPECIFICATIONS
  
  

  Check for cylinder head watertightness
  	Testing pressure	max. 3.0 bar

• Check the cylinder head in for tightness in a water bath.

Result 

» Air bubbles develop.

Measure

• Check the cylinder head for damage at the point of exit of the air bubbles.

Measure

• Repair or replace cylinder head.

• Disassemble the valve of the special tool 2 361 215 .

  Courtesy of BMW OF NORTH AMERICA, INC.

• Install the venting connector (1).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Venting connector/special tool to cylinder head
  M10	tightening torque 18 Nm

  Courtesy of BMW OF NORTH AMERICA, INC.

• Loosen screws (2).
• Guide out and remove the special tool 2 456 190 from the cylinder head (2).

  Courtesy of BMW OF NORTH AMERICA, INC.

• Release screws in the sequence (14) to (1) from the cylinder head (A).
• Feed out and remove screws (14) to (1).
  Fig 2: Cylinder Head Screws Loosening Sequence

  Courtesy of BMW OF NORTH AMERICA, INC.
• Feed out and remove cylinder head (1) from the special tool 2 361 215 .

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work 

• Refer to INSTALL ALL VALVES .
• Refer to INSTALLING VALVE STEM SEALS .
• Refer to INSTALL ALL VALVE SPRINGS .
• Refer to INSTALLING ALL HYDRAULIC VALVE CLEARANCE COMPENSATING ELEMENTS  .
• Refer to INSTALL ALL ROLLER CAM FOLLOWERS .
• Refer to INSTALL EXHAUST CAMSHAFT (CYLINDER HEAD REMOVED) .
• Refer to INSTALLING THE ECCENTRIC SHAFT (CYLINDER HEAD REMOVED) .
• Refer to INSTALLING THE SERVOMOTOR FOR THE ECCENTRIC SHAFT (CYLINDER HEAD REMOVED) .
• Refer to INSTALLING THE INTAKE CAMSHAFT (CYLINDER HEAD REMOVED) .
• Refer to CHECKING THE INTERMEDIATE LEVER CLASSIFICATION .
• Refer to INSTALLING ALL INTERMEDIATE LEVERS .
• Refer to INSTALLING ALL GATES .
• Refer to ADJUSTING THE ECCENTRIC SHAFT TO THE MINIMUM LIFT (CYLINDER HEAD REMOVED) .
• Refer to CHECKING THE POSITION OF THE INTAKE CAMSHAFT (CYLINDER HEAD REMOVED) .
• Refer to INSTALL THE TORSION SPRINGS (CYLINDER HEAD REMOVED) .
• Refer to REMOVING THE CYLINDER HEAD FROM THE ASSEMBLY JIG .
• Refer to INSTALLING THE EXHAUST TURBOCHARGER (CYLINDER HEAD REMOVED) .