The vane pumps we have for raw water are self priming and have lift meaning that they will suck up water and don't need vented. The caveat is that they don't suck air or pump air as well as they do water so it does take some time to prime.
You're right for fresh water cooled systems. The thermostat is in the glycol loop not the sea water flow path. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Oct 27, 2015 10:27 PM, "David Knecht via CnC-List" <cnc-list@cnc-list.com> wrote: > I am trying to reconcile this discussion with my winterizing experience > last year. I use a bucket of antifreeze in the cockpit and run a tube to > the raw water intake inlet outside the hull. I did not see any water draw > before I started the engine (or after) so even with that pressure head, I > did not seem to be pushing water into the engine. Last year, it seemed to > take a long time for the water to begin being sucked through from the > bucket. At the time, I attributed this to it taking a while for the engine > to warm up and the thermostat open. But now, when I look at the engine > info I have, it looks like the thermostat is on the antifreeze circulating > path, not on the raw water path. So why would there have been a delay in > the draw from the bucket? Dave > > On Oct 26, 2015, at 10:29 AM, Marek Dziedzic via CnC-List < > cnc-list@cnc-list.com> wrote: > > Dave, > > good thinking! > > Since the water came from behind (exhaust side), and you did not turn the > engine, there was a good chance that you would be able to suck most of it > the same way. > > However, I would not put too much faith in your impeller. If the impeller > is good, the pump should prime from the cockpit (no need to pour any water > into the hose). If it did not prime on its own, it means that it is not > working properly. The impeller may look good, but it may slip on the shaft > or the pulley (the v-belt) is slipping. I would be afraid that this may > create some cooling problems. There is nothing you need to do for the > winter, but I would think hard on addressing this before the next season. > > When you do your feed bucket method, do you have a shut off valve at the > hose from the bucket to the engine? If you don’t, adding it helps a lot, as > you can shut off the water (AF) feed from the cockpit and turn the engine > off, when the water is pumped out of the hose. > > Btw. If you don’t like the idea of having any head of water in front of > the water pump, you can try a method with a bucket on the ground and a hose > leading from the bucket to the raw water intake throughhull. You can cut a > thread on the inside of that throughhull and screw in a barbed nipple into > it. The Good Old Boat Nov/Dec 2014 issue had an article on that. I have a > scanned PDF if you are interested. > > Marek > > *From:* davepulaski via CnC-List <cnc-list@cnc-list.com> > *Sent:* Monday, October 26, 2015 3:40 AM > *To:* cnc-list@cnc-list.com > *Cc:* davepulaski <davepula...@hotmail.com> > *Subject:* Stus-List Hydrolocked! > > Good news! > > I was able to resolve the hydrolock with no apparent ill effect on the > engine! It was quite an easy fix as well, didn't even need to mess with > the injectors. > > Here's what I did, following a suggestion of someone on this thread: > > I disconnected the exhaust hose from the manifold and connected my shop > vac to the header outlet. Then, with the vac running and all three > decompression levers open, I turned the engine by hand a few times from the > main pulley, then spun it a bit with the starter motor. > > After closing the decompression levers, reconnecting the exhaust and > setting up my water feed bucket - this time in the aft cabin and NOT up in > the cockpit - I went for ignition. It fired up more readily than I > expected, and ran great with no new vibrations or noises. The raw water > pump impeller was completely intact and looked like new. > > The oil was a little milky so I changed that twice, ran the motor for a > while to get it up to temp, then finally winterized it from the bucket. > > Hooray for a lesson learned without injury or great expense. > > > Thanks for all the advice guys! > > -Dave > > > > > Sent from my T-Mobile Galaxy Note 2 > > ------------------------------ > _______________________________________________ > > 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 > > > Aries > 1990 C&C 34+ > New London, CT > > > > _______________________________________________ > > 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 > > >
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