Quote:
Originally Posted by DrB
Why do you drain essentially all the AntiFreeze from the motor/exhaust lines after you put it into it? I never do that. Neither did my PO, who told me what he did to winterize the motor when I bought the boat.
DrB
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Antifreeze is not necessarily good for rubber hoses. I also don't want it sitting in my fiberglass waterlift muffler evaporating into the interior of my boat after I disconnect the exhaust hose to seal the exhaust manifold. I suppose I could just plug the exhaust hose but a few turns for the drain screw is easier. Also the waterlift had water in it before you started sucking in antifreeze which can dilute the antifreeze that shuld not be diluted.
We can see 30 below zero so I prefer to know there is less in there that could freeze. I also drain my HX and fridge HX (engine driven refrigeration) after antifreezing it. I've seen my fair share of owners with split stuff over the years up here, usually because of dilution. Sucking in one or two gallons is usually not enough to sustain a 20 below zero stretch that's why I do about 4 gallons then also drain as much as I can on the raw water side..
One thing I forgot to mention is that you should always check the sealed side of the system for freeze & boil points and add antifreeze as necessary before winter..