11 12 729 Checking Cylinder Head For Water Leaks (N12)

WARNING: This page is about a different car, the 2008 MINI Cooper and 2007 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 9 521
11 9 522
11 9 523

Necessary preliminary tasks:

Remove cylinder head.
Disassemble cylinder head.

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: Identifying Special Tool (11 9 521)

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 9 523 to 25 Nm .

Fig 2: Identifying Special Tool (11 9 523 And 11 9 523)

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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 Special Tool (11 9 522) With Existing Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.