More or less how I do it. When I had an Atomic 4, I allowed the engine to heat up before adding the antifreeze to open the internal circulation valve (which can also be done manually, buy why work that hard?).
From: John Read via CnC-List <cnc-list@cnc-list.com> Sent: Wednesday, March 5, 2025 4:40 PM To: 'Stus-List' <cnc-list@cnc-list.com> Cc: John Read <johnprea...@gmail.com> Subject: Stus-List Re: Seacock Tee for winterizing the engine Easy peasy and safe way for fresh water cooled engine in salt water. (Yanmar 3gm with Sendor after market radiator) I usually do this while in water pending haul out. Close inlet seacock. Remove intake hose from water pump inlet which is on top of engine. Insert new hose into inlet fitting. Other end of hose (cut end at 45 degree angle) into bucket of fresh water with garden hose with shut off nozzle. Start engine which will suck fresh water. Slightly open hose nozzle so bucket maintains constant level. Run engine at faster idle for a few minutes to thoroughly rinse out all salt residue and minimize residual water in muffler. Open gallon jug of RV antifreeze (I use the -100 degree stuff just for extra measure) Remove hose from bucket insert in antifreeze. Suck a gallon. Shut off engine just before use up all of antifreeze so liquid remains in pump and impeller doesn’t dry out. Open seacock, drain residual water. Remove strainer top or body to clean. Reattach cooling line to pump inlet. Done. Has worked flawlessly for over 40 years. John Read Legacy III 1982 C&C 34 Noank, CT From: CHARLES SCHEAFFER via CnC-List Sent: Wednesday, March 05, 2025 4:07 PM To: Stus-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Cc: CHARLES SCHEAFFER <cscheaf...@comcast.net <mailto:cscheaf...@comcast.net> > Subject: Stus-List Re: Seacock Tee for winterizing the engine Stuffing a hose into the inlet works on the hard, but not when the boat's afloat. I also don't like to tie up another person for such a mundane task. The seacock tee idea came from Don Casey and makes it a quick and easy one man operation. I usually have four gallons of pink stuff in a five gallon bucket and run a few gallons through before shutting down. I don't like to waste it or pollute, so I hang another bucket near the exhaust outlet and watch the exhaust water color change from clear, to light pink when I swing the bucket to catch the strong bright pink, before shutting down. That uses a few gallons, but I'm certain it gets everywhere and I capture the last gallon and use it inside for the sink traps & drains and ice box drain, etc. I added a tee to the thruhull for the air conditioner intake and use the same bucket and hose and similar method. I can run the air conditioner pump without running the compressor. Chuck S On 03/04/2025 2:52 PM EST Firewater via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: It takes a 2nd person, but our method is extremely simple. Our boat came with a length of hose where one end has several wraps of rigging tape. This fits snugly in the thru-hull and we just put the hose into the jug and suck the antifreeze directly into the engine. No tools required. Jim Reinardy C&C 30-2 “Firewater” Milwaukee, WI Sent from my iPad On Mar 4, 2025, at 10:48 AM, David Knecht via CnC-List <cnc-list@cnc-list.com <mailto: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://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated. 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://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.
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://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.
