Join Date: May 2003
Location: East Norwich
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The engine is a Universal 5411 and it is raw water cooled. There is no radiator (or place to house coolant) that I know about and the thermostat was removed by the former owner.
I went down today after performing the muriatic acid flush and leaving it in the engine overnight. I flushed it this afternoon with sea water, fresh water from the hose and then sea water again. Water is rushing out better than ever but I'm still skeptical because I've been here before. I have a feeling that the hose from the sea **** to the pump is less than perfect. I think that when the engine in drawing so much water at high rpms, combined with the heat of the engine (because of its proximity) it is causing a portion of the hose to constrict. I'm not positive but I did go the hardware store (the closest place at the time) and got another hose that I knew wasn't right. I then went to a marine store to get what I think will be the right hose. It is much thicker than the current hose so I think it should hold up.
Last season I had a mechanic come by and clean out the exhaust but I am more than willing to do it again or remove it to bring it to a radiator shop if the problem comes back. I appreciate your offer and will definitely call upon your expertise if and when that happens.
At this point, I tested it for a while at the dock, both under load and in neutral but it was raining and I was getting soaked so this only lasted about an hour. I have to take it out to really see if its working properly at high rpms for extended periods of time (2-3 hours) before I'll believe that it is truly working. I hope there's no wind when I do this, otherwise the other sailors will laugh that I'm buzzing around the harbor at 6 knots for hours on end during a perfectly good day. :-)
Good luck with your engine. Please let us know how it goes.
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