On my 3GM I had an overheating problem and ended up discovering that the pulley for the water pump was spinning on the shaft as the set screw had come loose.
Andy C&C 40 Peregrine On Mon, Oct 19, 2015 at 1:23 PM, Gary Nylander via CnC-List < cnc-list@cnc-list.com> wrote: > I had the exact same symptoms on my 2QM15 for many years. I tried > everything I could think of. Finally, when it got worse, I followed the > water from outside the hull through all of the parts of the engine. At long > last, I found a small bit of an impeller in the hose leading to the area > where the zinc is located on the front of the engine (after replacing > zincs, and nearly everything else). It was rusty and crusty and must have > been there, bouncing around, for years. I know it must have been there > before I bought the boat 20+ years ago, because every time I replaced the > impeller, it was intact. And, even when it was wailing at me, it had some > water coming out of the exhaust, just not as much as it has now. > > So, start at the water inlet and look at everything, one careful step at a > time. Check the hoses, sometimes they look good on the outside but collapse > on the inside, thus blocking water when it is warmed up. > > Good luck. > > Gary Nylander > 30-1 #593 > > > > ----- Original Message ----- > *From:* Dreuge via CnC-List <cnc-list@cnc-list.com> > *To:* cnc-list@cnc-list.com > *Cc:* Dreuge <dre...@gmail.com> > *Sent:* Monday, October 19, 2015 12:56 PM > *Subject:* Re: Stus-List Engine Overheat Question > > Al, > > This sounds like a similar problem I experienced with my old C&C 29 which > had a raw water cooled 2QM15. The alarm only came on only after the > engine was shutdown for a short period of time and then restarted. I > would even let the engine cool at idle speed for a good few minutes before > shutting down. I tried many things, and listened to may good suggestions > (air lock, pump wear, …), but in the end the problem turned out to be a bad > thermostat sender. > > Maybe that’s your issue too. Do you have a separate sender for the alarm > and for the gauge? If so, then it is unlikely that both would be bad. But > if not, I would start there. > > Paul > > > - > Paul E. > 1981 C&C 38 Landfall > S/V Johanna Rose > Carrabelle, FL > > http://svjohannarose.blogspot.com/ > > On Oct 19, 2015, at 9:03 AM, cnc-list-requ...@cnc-list.com wrote: > > Date: Sun, 18 Oct 2015 16:08:19 -0700 > From: Al Serrato <aserrat...@yahoo.com> > To: "cnc-list@cnc-list.com" <cnc-list@cnc-list.com> > Subject: Stus-List Engine Overheat Question > Message-ID: <411a5ff3-f777-4f52-9bf4-0d90cac65...@yahoo.com> > Content-Type: text/plain; charset=us-ascii > > I'm looking for advice on a situation that arose yesterday. I have a 34 > with a 3GMD diesel with raw water cooling. I motored for about 45 minutes > at 2000 rpm and then shut the engine down. Everything was running smoothly. > The temp gauge showed the normal 100 degrees and I could hear water from > the exhaust. I sailed for about half hour but then lost the wind and turned > the motor on. The high temp alarm stayed on and the gauge showed 140 > degrees. I shut it down and checked the water filter, which looked fine. I > tried starting it a couple more times with the same result, so I sailed > back to my harbor. When I went to start it, everything worked fine again, > and I ran the motor for a good 30 minutes with no issues. The gauge stayed > at 100 the whole time and no alarm. > > I initially thought it might have been the impeller (which is about 1.5 > years old right now), but when the problem arose I didn't check for the > sound of exhaust water. Since it was working back at the harbor, I don't > think the impeller was bad. I'm starting to think that the sending unit > malfunctioned and then reset itself somehow but that's never happened > before. > > I'm not sure what temp triggers the high temp alarm and whether the same > sending unit goes to both the alarm and the gauge. > > Am I missing something obvious? > Were there other steps I should have taken to diagnose it? I was of course > concerned to run the engine for long if it was overheating. > What next steps should I take, since everything seems fine right now. > > Thanks in advance for any help. > > Al Serrato > C & C 34 > Fidelity > San Francisco Bay > > > ------------------------------ > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > -- Andrew Burton 61 W Narragansett Ave Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ phone +401 965 5260
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