11 12 729 Checking cylinder head for watertightness (N20, N26)
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.
NOTE:
The special tools 11 4 342
and 11 4 344
are included in the set of special tools 11 4 340
.
Necessary preliminary tasks:
- Remove CYLINDER HEAD .
- Disassemble cylinder head . See 11 31 028 REMOVING AND INSTALLING/REPLACING EXHAUST CAMSHAFT (N20/N26) , 11 34 552 REMOVING AND INSTALLING/REPLACING ALL VALVES (N20, N26) or 11 31 025 REMOVING AND INSTALLING/REPLACING INTAKE CAMSHAFT (N20/N26)
Fit special tool 11 4 342 with screws (1).
Screw in knurled screw in direction of arrow.
Sealing flange must rest flat.
Fit special tool 2 212 824 .
Installation note:
Secure special tool with maximum 20 Nm.
Order number: 83 30 2 212 824
Secure special tool 11 4 344 with screws (1).
NOTE:
Compressed air at valve 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.
Assemble engine.