11 12 729 Checking cylinder head for watertightness (N54, N54T)

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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:

Remove CYLINDER HEAD .
Disassemble CYLINDER HEAD .

NOTE: Observe mounting of special tool 11 4 341 on cylinder no. 1

Secure special tool 11 4 341 using bolts 11 4 345 tightened to 25 Nm

Fig 1: Identifying Special Tool 11 4 345 On Engine Cylinder

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Extend special tool 11 4 341 with special tool 11 4 345.

Installation note:

1 cyl is marked.

Fig 2: Identifying Special Tool 11 4 341

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Fit special tool 11 4 342 with bolts (1), insert knurled screw in direction of arrow.

Sealing flange must rest flat.

Fig 3: Installing Special Tool (11 4 342)

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Secure special tool 11 4 344 with screws (1).

NOTE: Compressed air at valve (2) must not exceed 3 bar.

Heat cylinder head to 60°.

Check for bubble formation in a water bath.

Fig 4: Identifying Special Tool (11 4 344) With Screws

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Assemble engine.