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Old     (superair502)      Join Date: Mar 2010       03-26-2011, 9:53 PM Reply   
So I was thinking I was out of the woods with the temp rising here last week and got my boat out to test my new ballast set up and started it obviously. I keep it in a stroage unit which is closed. I wouldnt say its full closed as there is about a 3 inch gap from the ground to the back wall but the front and sides and roof are closed. temp dropped to 30 degrees just a few minutes ago at midnight. So it will prolly be below 32 till about 7 or 8 i would guess. So how low would it have to get out side to bust my block? Considering that it is indoors and the temp should be a little higher than out side. The shop mechanic told me the other day I should prolly be ok but the weather temp has dropped alot and I dont like to deal in maybes with my boat motor.
Old     (lfadam)      Join Date: Nov 2008       03-26-2011, 10:47 PM Reply   
youll be fine. Generally you have to get below 25 for a significant amount of time to have a problem (or have a day where the high isnt above freezing or just above freezing). With being indoors, the insulation of the engine cover and the daytime temp being significantly above freezing, a few hours at 30 degrees wont be a problem. Once you start seeing 20s in the forecast, start taking notice, but if the daytime high is still 50, it should be fine. Always good to be safe rather than sorry, but I have heard of people having their boat unwinterized down to the teens and being OK.
Old     (mhunter)      Join Date: Mar 2008       03-27-2011, 6:13 AM Reply   
Every fall and spring I read posts like this will it be OK? The simple fact is water freezes at 32 degrees. So if you have water in your boat you are at risk. You may get away with it for years then
oops I need a new engine. For the 5 min it takes to drain the block why take the chance. I guess you just have to ask yourself " Do I feel Lucky" .
Old     (cwb4me)      Join Date: Apr 2010       03-27-2011, 7:30 AM Reply   
I agree with both adam and mike.It will be okay if it's only 30's at night.IT will remove all doubt and only take a few minutes to drain the block.
Old     (hunter660)      Join Date: Aug 2007       03-27-2011, 8:48 AM Reply   
It's just a valve on the side of the block, open it.
Old     (cadunkle)      Join Date: Jul 2009 Location: NJ       03-27-2011, 12:35 PM Reply   
Yep, drain the block and don't forget to drain the manifolds too. I'd be nervous below freezing without purging with antifreeze but I'm paranoid about this stuff. Even opening all hte drains you'll still have a small amount of water in low spots in the block. Not really a big deal since it's such a small amount and it'll have plenty of room to expand, but like I said, I'm paranoid. If you could get more freezing temps drain it, and drain it before tucking it away until we're into warmer weather.

That being said, you're probably fine just dipping a little below freezing. It takes more than overnight for inside temps to drop to the level of outside temps, and and then again in a boats engine compartment, then you have a large volume of water to freeze.
Old     (superair502)      Join Date: Mar 2010       03-27-2011, 2:16 PM Reply   
Thanks guys it's my first winter with my own boat
Old     (Bumpass1)      Join Date: Oct 2010       03-27-2011, 3:04 PM Reply   
I took mine out yesterday (my first boat also). Stopped by Lowes and picked up 2 cheap drop lights and put one in the engine compartment and the other next to the transmission/v-drive. It ended up snowing last night. I checked this morning and the engine compartment was about 55 degrees. I am going to keep them in there for a few days until I get out of the woods witht the brisk temps over night.
Old     (tro)      Join Date: May 2009       03-29-2011, 11:00 PM Reply   
it takes y'all 5 minutes to winterize? i have closed cooling and it takes me about 15 minutes to even get the bolts out of the manifolds, much less the vdrive, heater, etc.
Old     (denverd1)      Join Date: May 2004 Location: Tyler       03-30-2011, 6:34 AM Reply   
tro, think about a quick drain kit for it. On open systems, its not more than 4 or 5 plugs to pull.
Old     (murphy_smith)      Join Date: Dec 2005       03-30-2011, 7:16 AM Reply   
Mase - are you a member over on

I bet you could find step by step instructions with pics on how to winterize that GT-40 that your profile says you have. IMO - the 20 minutes it may take you, a first timer to winterize the boat, is much better than the $4,000 block rebuild you could potentially encounter.
Old     (bill_airjunky)      Join Date: Apr 2002       03-30-2011, 11:06 AM Reply   
Funny how we always see these threads every year.

Dude, your engine is screwed. Get out the checkbook & plan on a rebuild. Good luck.

Oh, and heater core is toast too.


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