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

Apply 3 bar of pressure (2) to the valve (1).

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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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