Cylinder Head Assembly: Testing and Inspection

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

Special tools required:







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 cylinder head.







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.







Secure bolts 11 9 523 to 25 Nm.







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.







Assemble engine.