Cylinder Head Assembly: Testing and Inspection

11 12 729 Checking cylinder head for watertightness (N63)

Special tools required:





Necessary preliminary work:
^ Remove left cylinder head.
^ Remove right cylinder head.
^ Remove all valves.





Note:
Set of special tools 11 8 080 can be used for cylinder bank 1 to 4 and cylinder bank 5 to 8.

Position special tool 11 8 081 on cylinder head.





Insert special tool 11 8 083 and tighten in sequence (1 to 10) in several steps.

Tightening torque: 25 Nm





Remove vent screw (1).

Tightening torque: 11 12 8 AZ.

Installation Note:
Replace sealing ring.





Important!
Max: 0.8 Nm.

Screw in special tool 11 8 082 with suitable tool and special tool 00 9 250 to 0.8 Nm.

Connect compressed air hose with pressure gauge.

Immerse cylinder head in a water bath.

Inspection pressure 4.0 bar.

Check cylinder head for escaping air (cracks).





Note:
If necessary, add cleaning agent to water bath.

Assemble engine.