Checking cylinder head for watertightness

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CAUTION: Spring preload .
Injury hazard!

The use of the specified special tool (tool) is mandatory.
Carry out the described steps properly.

NOTE: RISK OF DAMAGE
Contaminant or foreign body .
Contamination can result in malfunctions, loss of function or leaks .

Adhere to the utmost cleanliness.
Protect components from contamination e.g. by covering.
Close off line connections with seal plugs.

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 SPECIFICATION

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 SPECIFICATION

Special tool 2 456190 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.

TIGHTENING TORQUE SPECIFICATION

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

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Check

Heat up the cylinder head.

TECHNICAL DATA SPECIFICATION

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

Connect compressed air.

TECHNICAL DATA SPECIFICATION

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 .

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Install the venting connector (1) .

TIGHTENING TORQUE SPECIFICATION

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) .

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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
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Feed out and remove cylinder head (1) from the special tool 2 361 215 .

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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) .