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.
Heat cylinder head to 60 °.
Check for bubble formation in a water bath.
Necessary preliminary tasks:
- Remove CYLINDER HEAD .
- Disassemble cylinder head. See REMOVING INTAKE CAMSHAFT and REMOVING EXHAUST CAMSHAFT .
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.