This is not exactly how the flexible vane pumps work but pretty close. The idea of expanding and contracting volumes is well shown.
https://youtu.be/L30JpM8Lv_A Josh On Mon, Jun 8, 2020, 11:47 David Knecht via CnC-List <cnc-list@cnc-list.com> wrote: > I thought I might have had a problem with the fresh water side of the > cooling system of my Universal M4-30 engine because it was heating water > very slowly. I now think that it is just that the sea water is cold this > time of year and it was taking longer than I expected. All was fine with > lots of hot water after an extended motoring session at speed as opposed to > idling at the mooring. However, it made me think about this side of the > cooling system. Presumably, minimal fresh water circulates through the > heat exchanger until the thermostat opens. My question is, what drives > that water circulation. I know to check the impeller on the raw water pump > side periodically, but I have seen no mention of doing the same for a water > pump on the fresh water side. That pump appears to be pretty inaccessible > on my engine anyway and nothing in the routine maintenance section talks > about periodic replacement of an impeller there. So I am guessing it does > not have an impeller that needs replacement, but I can’t find anything > relevant in the manual. Thanks- Dave > > David Knecht > S/V Aries > 1990 C&C 34+ > New London, CT > > > _______________________________________________ > > 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
