Bleeding Beta engine

[Wakatere]

No I'm not swearing (well, I have been).

I've got an airlock in the cooling circuit in my Beta BZ482 (14HP) - I'd be glad to have any tips on bleeding it. In particular - is that screw in the middle of the thermostat housing a bleed vent?

TIA
Charles

 

[30boat]

You can remove that.Maybe the air that's blocking the circuit will escape then.Don't forget to put it back