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

Tighten the venting connector (2).

TIGHTENING TORQUE SPECIFICATIONS

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

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