Molesworth brought forth on stone tablets:
Never had a prob with the Yanmar 50hp diesel till today.

Two coolant systems - raw water (OK) and closed system - lost all
coolant - refilled - lost it all again about an hour later. Found one
small leak - the top vent hole in the vented loop.

Why is coolant dribbling out of the top of the vent loop?

Luckily the win was beam reach all the way home!


Why is there a vented loop on the engine coolant side? Or are you
saying that coolant is coming out of the raw water vented loop?

bob
s/v Eolian
Seattle