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I think I have successfully plastic welded my split coolant overflow tank.
I can't blow any air through leaks under water.

Does anyone know what the pressure in the cooling system is that the tank should be able to withstand?

Thanks,

SMS

I wouldn't tell any crap, but the 907's cooling system wouldn't be under pressure.
So, it's enough that it doesn't have any leak.
Ciao

the working pressure is marked on the water cap.
That should be 1.1 or 0.9 (this means 110% or 90% over the normal atmospherical pressure)