Cylinder Head Assembly: Testing and Inspection

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

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.





Secure special tool 11 9 523 to 25 Nm.





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.





Assemble engine.