11 12 729 Checking cylinder head for water leaks (N14)

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

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:

Mount special tool 11 9 521 with bolts 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)

Courtesy of BMW OF NORTH AMERICA, INC.

Secure bolts 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.

NOTE: Sealing flange 11 9 522 must rest flat.

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

Heat cylinder head to 60°.

Check for bubble formation in a water bath.

Fig 3: Identifying Screws Of Coolant Thermostat And Valve

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.