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post #21 of 30 Old 11-07-2019
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Re: Heat lamps for temporary freeze protection

Run the engine dry for a few seconds, open all the seacocks, run water out of freshwater lines. Shouldn't take more than 30 minutes. When you have time you can do it properly. Otherwise, I wouldn't be too worried until the average temperature (day and night) stays below freezing. I have found spiders in my bilge walking around after weeks of temperatures 20 degrees below freezing... but, that is another story.
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post #22 of 30 Old 11-07-2019
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Re: Heat lamps for temporary freeze protection

Tube heaters is relatively safe to use. I place it low close to the engine so the heat flow up.
https://www.amazon.co.uk/Protection-.../dp/B00EZ4X48M
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post #23 of 30 Old 11-07-2019
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Re: Heat lamps for temporary freeze protection

Perhaps heating pads designed for automotive use at critical locations ?
https://www.jegs.com/webapp/wcs/stor...rsistYmm=false
Or heat tape or pipe designed for water pipes ?
https://www.lowes.com/pd/EasyHeat-AH...QJ3w&gclsrc=ds

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Last edited by capttb; 11-07-2019 at 12:29 PM.
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post #24 of 30 Old 11-07-2019
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Re: Heat lamps for temporary freeze protection

Heat tape designed for home water pipes is mostly about copper which is an excellent conductor of heat. Synthetic rubber engine supply lines not so much.

Doing this right after dark on Friday night is going to be a PITA and it's only supposed to drop below freezing for a few hours early Saturday morning. If the boat can be plugged in, I'd go with incandescent light bulbs in construction cages inside the engine compartment and assuming a pressurized water system, I'd open the taps to a slow trickle and not worry about it. I'd do the whole thing right on Saturday in daylight with temps in the 40s. It's going to be much colder next week, but there's time to get it done right before then.
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post #25 of 30 Old 11-07-2019 Thread Starter
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Re: Heat lamps for temporary freeze protection

Thanks, everyone, for the suggestions. I hope this thread is helpful to others too.

I agree that the risk to my boat tomorrow night is not great, according to the current forecast. But you know what happens to forecasts sometimes. Here in Wisconsin it was 25 degrees a few hours ago (same temperature as forecast in PA tomorrow night), and there was black ice everywhere and it felt cold. I know all about heat transfer, enthalpy of fusion, and all those things that can slow the actual rate of freeing in an enclosed space. To me, this is about more than tomorrow's low temperature - I consider it a "drill" to see how much I can get done as a learning process for a similar need that may arise in future years. I'm going have to do all this eventually anyway, and if I can get most/all of it done tomorrow evening I can relax and enjoy the weekend with my wife, which I know she'll enjoy because our weekends have been so dominated by the boat recently.

Today a Little Giant impeller pump arrived at my house to assist with pumping the antifreeze through some difficult areas, especially my A/C which is vulnerable because the water loop is oriented vertically and therefore does not drain or blow out well with a compressor. I just got in from Menards (amazingly huge store that they don't have in Philly area) where I was able to find all the NPT and hose barb fittings that I need to connect up to all the plumbing. So we'll see how much I can get done tomorrow night and hopefully be done with it. If I can't get to the diesel tomorrow I'll have some low/medium wattage heating options for the night and I can do that during daylight over the weekend.

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Last edited by TakeFive; 11-07-2019 at 11:32 PM.
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post #26 of 30 Old 11-10-2019
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Re: Heat lamps for temporary freeze protection

Quote:
Originally Posted by chef2sail View Post
Well I guess we have to plan like we could have an earthquake any time now. .....not
🤭🤭🤭🤭🤭🙀🙀🙀🙀🙀🙀😃😃😃😃😃😃😃
We've had earthquakes in Chicago. Things can happen, like flying cars in New Jersey.
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post #27 of 30 Old 11-10-2019
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Re: Heat lamps for temporary freeze protection

Yeah we’ve had earthquakes in Maryland....houses hit by airplanes...none of these are really common. You can plan for everything.


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post #28 of 30 Old 11-10-2019 Thread Starter
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Re: Heat lamps for temporary freeze protection

Yeah, I was up all night Friday sweating out the earthquake thing. It was a close call, but my boat survived the night.

Rick S., Swarthmore, PA
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Re: Heat lamps for temporary freeze protection

No ground moving under your feet....good🤭🤭🤭😀😀😀


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post #30 of 30 Old 11-11-2019
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Re: Heat lamps for temporary freeze protection

For my fellow boat owners that have a raw-water-cooled motor like the Volvo MD17c or MD11 (or earlier), do not let it freeze.
It does not take long to cause the most awful damage... 4 lovely big cracks in the aftmost barrel, one of which was leaking.
Although mine happened after a long free-up, I am reminded that one single night of freezing will do it.
The forces are simply terrible. Ice takes no prisoners. Ice just loves cracking castings and they are very difficult to repair indeed.
So don't learn it the way I did.
It is now fixed (a replacement barrel), and I drain the motor each time I leave it in winter.
With practice, I can drain the motor, and gearbox, and water strainer in 10 minutes. We checked it against the clock last time.
Another point, if you don't cycle your drain plug valves, they will sieze up, and if you only use them once a decade, they will shear off flush when you try to use them (and you will say a rude word when it happens), so cycling them and putting some grease on the threads is not a bad idea from time to time. Used annually, and lubricated, they will work perfectly.

Rockter.


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