Had small loss of coolant
from my Yanmar
4JH3-TE for years. Not a big problem, the antifreeze lost
just makes a mess on and under the engine
Now have re positioned the header tank. Previously mounted on a bracket bolted directly to the engine
. Now, using the same bracket, just turned around, mounted on the side wall near the engine. Problem solved.
I think that the water
in the header tank was atomising at certain engine vibrations and exiting via the header tank overflow. It was not obvious where the coolant
loss was coming from.
Whatever, this seems like a 100% cure and all you need is a suitable fixing bolt. Recommend this if your header tank giving a water