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

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

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 Inlet and Exhaust cylinder heads .

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: Special Tool (11 9 521)

Courtesy of BMW OF NORTH AMERICA, INC.

Secure bolts 11 9 523 to 25 Nm .

Fig 2: Special Tool (11 9 523)

Courtesy of BMW OF NORTH AMERICA, INC.

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: Screws, Valve And Special Tool (11 9 522)

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.