I posted the same problem on here when I first got my boat. It overheated terribly in the first 2 hours of a 100 mile trip from the south shore of Long Island through the city to the north shore so we had to sail most of the way, and of course, the wind was directly on our bow the whole trip. I posted a message on here and received lots of great responses, mostly involving the impellor and the water pump. I had a mechanic come down and remove everything and clean it the best he could. He forced water though and made it come rushing out (under pressure). I thought the problem was resolved even though it wasn't "spitting" out water the way my neighbor (old, salty powerboater) thought it should. I assumed that because it was a small diesel and had already been cleaned by a professional that this was the best I would get.
I took the boat out again and ran the engine a little longer than I "should have" and it happened again. One of the suggestions I didn't take from someone on here was to do a muriatic acid flush. I had heard the same things you heard and thought it was a little too extreme now that water was coming out, but obviously something had to be done. I followed the suggestion and did a muriatic acid flush and now the water comes rushing out the way it should. My old, salty neighbor approves too! If I can find the link he gave me showing how to do it, I'll post it here. I was only going to buy the heavy duty stuff because I thought, "if I'm going to do this, I'm going to do it right" but the guy in the hardware store told me that the less caustic version worked just as well and is way less damaging to the skin. I'm not one for gloves or goggles and this is definitely a job where this stuff could get on you so I recommend the less caustic version. Good luck. Michael Gracie Day '84 Catalina 27 #5460 --- In [email protected], "rasiedel" <rasie...@...> wrote: > > Years of other owner's neglect and mine have lead to little or no salt water > running through my 27. She is located in San Carlos, Sonora, Mexico and I > visit- and work on her 2 or 3 months a year. She sits on a trailer. I have > checked and replaced the impeller, checked all hoses and elbows. removed the > exhaust manifold and cleaned out what I can see. I have be advised to run > Sulfamic Acid, in a solution, through the cooling system-- haven't done this > yet -- Others suggest Muriatic Acid but warn of losing gaskets. Other than a > total removal of the engine and machine shop "cooking" --- I've run out of > ideas-- Any suggestions?? Ralph >
