If you cut the fresh water hose between the thru-hull and the raw water strainer, you can insert a three-way ball valve. The common side goes to the raw water strainer. One of the other sides goes to the thru-hull. The third opening is fitted with a hose adapter. Attach a hose that can reach to the bottom of a container of antifreeze. To winterize the engine: Start the engine and run the hose to the bottom of the antifreeze container. Turn the ball valve so that it sucks the antifreeze into the engine (through the raw water strainer). When antifreeze exits the exhaust, shut off the engine. Then reverse the ball valve so that it is ready to suck fresh water. One advantage of this method is that you have a way to use the engine to empty the bilge in an emergency. (Remember to use RV antifreeze, not regular engine antifreeze (which is toxic).
Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR On Tue, Mar 4, 2025 at 8:49 AM David Knecht via CnC-List < cnc-list@cnc-list.com> wrote: > There was a prior discussion regarding winterizing the engine where > someone described converting the engine raw water seacock into a > Tee-fitting so that antifreeze could be run into the engine to winterize > the boat. This would allow the process without having to remove the hose > from the raw water strainer or the seacock. I can't find that email > anywhere so I am wondering if anyone has notes on how this was done. I > presume you would use a standard brass Tee fitting, adapters (all the ones > I have found have female threads so require an adapter to add to the > seacock) and two shutoff levers, one for each water path. Thanks- Dave > > S/V Aries > 1990 C&C 34+ > New London, CT > > > Your contributions help pay the fees associated with this list and help to > keep it active. Please help by making a small contribution using PayPal > at: > https://urldefense.com/v3/__https://www.paypal.com/paypalme/stumurray__;!!LIr3w8kk_Xxm!o2pyWLyNh9LcNkWusblW9eL9LWDQMRAWaAJ6JcSiR2CqFlLSEJwyyIJx-0ZvBbXgZKkgJLcjckoMGnJo7vmtWi8$ > All contributions are greatly appreciated.
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