Brisfit,
the ball and spring should both be brass .
the spring is VERY light as it only produces around 2 psi pressure in the cooling system when working correctly .
How did you clean the seat in the top tank ?
If you damaged the seat it will not hold pressure .
But regardless of the pressure or whether the seat is damaged, it should not be leaking coolant from the pressure overflow .
How high are you filling the top tank ??
If it is overfull the coolant will expand once it is to temperate and the only place to exit is past the ball .
I fill my radiator to about 1/2 down from the bottom of the filler neck , which is below the ball and spring and very rarely ever have to top it up.
Where are you located and can you please give me details of your 400 .
Tks
Geoff Dowdle
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