Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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Re: winterize an engine exhaust system
You will get a lot of answers to this question.
Here is what I do, and I have an M25 in my O'day 35;
I have a sea water strainer between my through hull, and the raw water pump.
I shut the through hull, and remove the cap from my raw water strainer.
I remove the drain from the waterlift muffler on the exhaust.
I drain the raw water strainer, or suck it dry with a shop vac.
I invert a gallon of -60º antifreeze onto the top of the raw water strainer. I also have another gallon ready to go, if this one empties.
I start the engine, and watch the exhaust drain until the exhaust turns purple. I then shut down the engine.
I then take the (empty) gallon of antifreeze off of the strainer.
I then remove the raw water impeller, and leave the cover off.
I remove the zinc from the heat exchanger, and vacuum the liquid as it spills out with the shop vac. I keep the vacuum on the heat exchanger zinc nipple until I start drawing air from the raw water pump.
I then remove the end cover from the heat exchanger, and vacuum out the HX chamber.
Finally, I vacuum out the waterlift muffler from the drain, but I leave the drain plug off until the spring.
Hope this helps...
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USCG Licensed OUPV Captain, ASA 101/103/104/105/106/118 Instructor - Also certified in Marine Electrical Systems
Last edited by eherlihy; 12-04-2013 at 05:21 PM.
Reason: changed "impeller" to "raw water pump".