You can get diaphragm rebuild kits for your pump. Or you might just try disassembly, clean, reassemble.
Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mon, Jul 9, 2018, 10:49 PM Marek Dziedzic via CnC-List < cnc-list@cnc-list.com> wrote: > If we are talking about the water pressure pump… > > > > My pump works, but this season it started to work a bit differently. In > the past it provided a steady flow and usually shut down for a moment (as > the pressure rose) and then turn itself on. The pitch (noise) was constant > (almost). This year I noticed a bit less pressure and the pump is cycling > (about once a second) alternating the pitch (faster/slower). It still turns > itself off, when the tap is closed. > > > > I wonder if there is anything I should look at first (short of replacing > the pump). > > > > I would appreciate any suggestions. > > > > Thanks > > > > Marek > > 1994 C270 “Legato” > > Ottawa, ON > > > > *From:* CnC-List <cnc-list-boun...@cnc-list.com> *On Behalf Of *Josh > Muckley via CnC-List > *Sent:* Monday, July 9, 2018 10:43 > *To:* C&C List <cnc-list@cnc-list.com> > *Cc:* Josh Muckley <muckl...@gmail.com> > *Subject:* Re: Stus-List Water tanks pressure pump > > > > Typically the water pumps are rubber diaphragm style with either one, two, > or three diaphragms. There are often inlet and outlet check values as > well. The checks and diaphragms are rubber flappers that push/pull, > seat/unseat alternately as a drive motor runs. As the rubber gets old and > as gunk grows in the water system the rubber shrinks, hardens, and deforms > so that it no longer seats properly to push/pull water or prevent back > flow. One of the first symptoms is that the pump has difficulty drawing > water (dry priming). Since air is less viscous than water, it leaks past > the sealing surfaces. If the pump is already primed then the more viscous > water will create enough back pressure to seal the seating surfaces. You > can then pull water from the tanks. As long as a relatively uninterrupted > supply of water is maintained the pump will continue to work. Once the > tank goes dry there is no more water to seal the seating surfaces and > swapping to the other tank may not be enough since the pump is no longer > creating a suction to prime the pump. > > > > Propylene glycol and bleach, the 2 chemicals typically added to freshwater > tanks, will degrade rubber components over time. > > > > Josh Muckley > > S/V Sea Hawk > > 1989 C&C 37+ > > Solomons, MD > > > > On Mon, Jul 9, 2018, 9:09 AM Maurice Poulin via CnC-List < > cnc-list@cnc-list.com> wrote: > > Hello, > > As new owners of our C&C 30 mkii, we were out for a first weekend and had > a ball. Very comfortable and loads of fun on the water was our overall > appraisal! But we did run into a bit of a snag and I turn to the board for > assistance hopefully. > > The boat has two tanks and we ran out of water on the forward tank pretty > much on our last evening so switched over to the second tank but never > could get the pump to prime and draw water from the second tank and charge > up the lines. Checked all connections and no leaks, plenty of water in the > settee tank, checked strainer on the pump all okay. Both tank connect to > this distribution gizmo with assorted ball valves that connects to the pump > and from there to the galley and head. As the boat is new to me, I suspect > I may not be working this gizmo thing correctly, not opening up the correct > valves or maybe closing them while thinking I am opening them. I see on the > valve handles that one side is pointed while the other side is round, > possibly indicating on and off? Anyways, confusion and the fear of running > down the batteries to troubleshoot stopped me from tearing this thing > apart! I figured I would ask questions before doing exploratory work at the > dock! What should I be doing appropriately to switch from tanks or can you > run both tanks together, or not? > > Alternately, the pump seemed to be not priming but I thought it was a self > priming pump perhaps I am mistaken in that, so how do you prime a pump > would be an alternate question? > > Thank you all from this newbie that had a hand pump at the galley > previously! > > Cheers, > > Maurice Poulin > C&C 30 MKII, Monoloy > > _______________________________________________ > > 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 > <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.paypal.me%2Fstumurray&data=02%7C01%7C%7C72ef35f6d5494e35a78c08d5e5aa6ebe%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636667442513757148&sdata=II3RnHALDTl62fKEhCiyqZJxQ7b8LlUylTyL6cIfOmg%3D&reserved=0> > > _______________________________________________ > > 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 > >
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