Just a suggestion, if it happens again, pull the hose off of the through hull supplying raw water to your Yanmar. Open the valve and you should get a face full of SF Bay. If not, you may have sucked something into the raw water feed that did not hit the filter. In my case I found a very surprised looking smelt. I religiously watch the exhaust. I have been told that some engines produce steam, but I don’t understand why the manufacturer would design an engine that would exceed the cooling capacity. I understand in very cold weather the warm water will create some steam. With my boats, it was always a symptom of something in the system failing. Cheers Rick. Paikea C&C 37+
Sent from my iPad > On Jul 20, 2020, at 19:45, Al Serrato via CnC-List <cnc-list@cnc-list.com> > wrote: > > I had an unusual experience yesterday and am looking for any ideas on next > steps. > > I have a Yanmar 3GMD in my ‘81 C&C 34. I had used the motor for about 20 > minutes going out with no problems, but after starting it in heavy winds, it > rather quickly quit on me and would not start. I was heeling when I started > it and the tank was half full, so I bled the line thinking that some air had > gotten in, and it started right up. > > It ran for about 10 minutes and everything seemed normal although I thought > it sounded a little different. I couldn’t put my finger on what it was that > was different, and thought maybe it was my imagination but then the high temp > alarm went off and the gauge showed probably around 180. (It normally runs at > about 130). I shut it down and ended up getting a tow back in. The raw water > strainer was clean so I thought maybe the impeller might have failed, since > it’s close to two years old. But when I opened the pump, it was fine. I > replaced it with a new one anyway and ran the engine for 45 minutes today at > the dock, under load, and it ran fine. > > I always have white smoke coming out of the exhaust when I’m revving past > 1800 or so, but I don’t know if what I saw today was more than usual. The > engine was clean, no drips or leaks, no smells inside, just the usual smoke > from the exhaust. > > I couldn’t figure out why both the fuel and the raw water, which seem > unrelated, would both have problems at the same time, so I thought maybe it > was a blown head gasket or something like that. I figured when I started it > today, it would probably overheat right away again...but it didn’t. > > Any similar experiences or ideas on what it might be? I’ve got a call into > the mechanic but haven’t heard back yet. > > Thanks in advance. > > Al Serrato > Senza Fine > San Francisco Bay > > > Sent from my iPad > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray > _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
