Since the beginning of the season, we've had a very slow coolant
leak from the freshwater (antifreeze) side of our 100hp turbo Yanmar coolant
system. I just finished pumping out the containment bilge
below the engine
and evacuated approximately three gallons of greenish brown, oily water
which had accumulated over a two month period (1000 miles). I refilled the coolant system which was down only three cups of fluid 24 oz. I can't see any obvious places where the coolant is leaking out, everything seems fine.
My first hunch is the engine water pump
is on its way out, but I can't get my head
in there to see if it's developed a drip without getting my face ripped off by the fan belts.
Any thoughts or ideas on what the most likely problem might be? It's not so easy on this setup to place the absorbent pads underneath the engine to find the leak.
Thanks in advance for your help.