11 12 729 Checking cylinder head for water leaks (N12)

WARNING: This page is about a different variant/trim than selected.

Necessary preliminary tasks:

Install special tool 11 9 521 with special tool 11 9 523.

Installation:

Install special tool 11 9 521 so that all water ducts are sealed.

Fig 1: Sealing Water Ducts Using Special Tool (11 9 521)

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Secure special tool 11 9 523 to 25 Nm.

Fig 2: Securing Bolts Using Special Tools

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Screw special tool 11 9 522 into place with existing screws (1 and 3) of coolant thermostat.

Sealing flange must rest flat.

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

Heat cylinder head to 60 °.

Visually check for bubble formation in a water bath.

Fig 3: Identifying Coolant Thermostat Screws And Valve

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Assemble engine.