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Cold weather boating.

Old 09-14-2020, 04:51 PM
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Default Cold weather boating.

Up here in New England specifically New Hampshire we're starting to get into the time a year where the weather starts to cool off. After being on the water for the day if I drain 4 pecock's on the manifolds and the lower block 2 on each side. Will it protect the engine from a light freeze 30 to 32゚? The days are still well into the seventies and sometimes low eighties. would hate to pull the season so short.

The engine is a 5.0 mercruiser and the drive is an alpha gen2.

Last edited by c4boom; 09-14-2020 at 05:51 PM.
Old 09-14-2020, 06:40 PM
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I live in Maine, I would not worry about it. You could do it if you want to. Yes we may get into those temps next month, but they will not be there long enough to worry about. I yank mine between Halloween and Thanksgiving depending on how the weather plays.
Old 09-14-2020, 06:46 PM
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If you open EVERY drain on your engine it will protect. That is, assuming the drains aren't blocked by rust. Just watch and see if water actually comes out. Check your owner's manual to be sure you are opening ALL the drains. That is every manufacturer's recommended method for winterizing.
Old 09-14-2020, 06:48 PM
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Or you could leave it in the water. Your engine won't freeze from an overnight dip below 32 if you leave it in the water.
Old 09-14-2020, 07:53 PM
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It would take a couple of days in the constant 20's before the block would freeze
Old 09-14-2020, 08:29 PM
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You would need 24 hours of 26 Deg. Weather. Don’t rush it, we’ll get there soon enough
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Old 09-15-2020, 06:06 AM
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We get dips into the low 30's and sometimes even the 20's for a few hours here in Florida some nights in the winter (though we haven't lately). About 10 years ago here it stayed below freezing from 1 am to 1pm the next day. Anyway, like someone else said, if you can put it in the water, that's best. If it's supposed to stay below freezing for more than a few hours and it's on the trailer, I'll hook up the motor to the muffs and run it up to temperature as it's getting cold outside.
Old 09-15-2020, 06:43 AM
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Just a freeze over night will not cause you engine to freeze up. Residual heat will keep it over 32. You can stick a light down in the bilge to keep it warm but some will say that's a fire hazard.
Old 09-15-2020, 08:41 AM
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salt water freezes at like 28 degrees....

I monitor weather/temps

Usually fine keeping boat in the water until December even January but some years there is a multi-day deep freeze where temps drop big time, one year I think it was 10-20 degrees for a couple days, first week of november.

So I installed quick disconnects, I can blow out all my external water fixtures (transom shower, fly bridge sink, etc), disconnect them and keep freshwater working inside. I also can tape over my engine room vents and drop bilge heaters in my main engine room and aft mechnical room where genset and water tanks are.

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