11 12 729 Checking cylinder head for watertightness (N55 hybrid)

Special tools required:

WARNING: Compliance with the following points is mandatory before beginning work:

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:

Fit special tool 11 7 190 .

Installation note:

Secure special tool to max. 15 Nm.

Fig 1: Identifying Special Tool (11 7 191)

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Fit special tool 11 4 342 with screws (1). Screw in knurled screw in direction of arrow.

Sealing flange must rest flat.

Fig 2: Fitting Special Tool (11 4 342) With Screws

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

NOTE: Compressed air at valve max. 3 bar .

Heat cylinder head to 60 °.

Check for bubble formation in a water bath.

Fig 3: Securing Special Tool (11 4 344) With Bolts

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Assemble engine.