11 12 729 Checking the cylinder head for watertightness (N47D20 K/U/O/T 1)

Special tools required:

IMPORTANT: Pressure-test cylinder head to max. 3 bar.
Heat cylinder head to 60 °.
Check for bubble formation in a water bath.

Necessary preliminary tasks:

Extend special tool 11 8 891 with special tool 11 8 893 .

Fig 1: Identifying Special Tool (11 8 891)

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NOTE: Mounting special tool 11 8 890

Use bolts to fasten 11 8 891 special tool 11 8 893 .

Tightening torque: 25 Nm.

Fig 2: Cylinder Head Bolts Tightening/Loosening Sequence

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Fasten special tool 11 6 232 with screw (1).

Fig 3: Identifying Special Tool (11 6 232) With Screw

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Secure special tool 11 6 231 with screw.

NOTE: Compressed air at valve (1) must not exceed 3 bar .

Heat cylinder head to 60 °.

Check for bubble formation in a water bath.

Fig 4: Securing Special Tool (11 6 231) With Screw

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Assemble engine.