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Old 10-21-2018, 08:57 PM
Cody2662 Cody2662 is offline
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So today I winterized my boat by myself for the first time. I changed the oil and filter and whatnot. But when I went to drain the manifolds both bolts were stripped and I couldnít remove. I will drill them out and get new plugs next year. In the meantime I ran it and dumped 5 gallons of RV antifreeze in it and fogged it. My question is do you think I got enough antifreeze in there to flush the rest of the water? Or should I dump more in? My wife said there was red coming out of the exhaust but I couldnít tell (Iím a bit color blind)


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Old 10-21-2018, 09:16 PM
waterlogged882 waterlogged882 is offline
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Originally Posted by Cody2662 View Post
So today I winterized my boat by myself for the first time. I changed the oil and filter and whatnot. But when I went to drain the manifolds both bolts were stripped and I couldn’t remove. I will drill them out and get new plugs next year. In the meantime I ran it and dumped 5 gallons of RV antifreeze in it and fogged it. My question is do you think I got enough antifreeze in there to flush the rest of the water? Or should I dump more in? My wife said there was red coming out of the exhaust but I couldn’t tell (I’m a bit color blind)


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You're good as long as the anti-freeze is rated to prevent freeze in the area where you live.

When you remove the plugs in the spring, install new (obviously) and tighten only to the point the water is not leaking. Stop right there. Not one bit more. It's all you need and will save the (new) threads.

You may have to chase the threads, clean them up, etc. Harbor Freight cheap taps (NPT) works good for that.

.
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Old 10-21-2018, 11:07 PM
Cody2662 Cody2662 is offline
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I sure hope it doesnít get below -50 or Iím gonna have bigger problems. Do you have any idea about how much water I should drain out? I pulled all the hoses from the lowest point was about it


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Old 10-22-2018, 11:02 PM
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wheelerd wheelerd is offline
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If you've drained everything I wouldn't worry. I live in Alberta where our winters can hit -30C. In 8 years with three different boats all I've ever done is drained the block and manifolds and all the hoses (raw water pump, cooling pump, thermostat, shower, heater.) I've never used antifreeze.
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  #5  
Old 10-23-2018, 09:30 AM
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You definitely want to get the manifold plugs off to drain and the two block drain locations (on mine the heater hose line on passenger side and the knock sensor on driver's side). Even though pink was coming out the back, if your engine didn't get to temp or the tstat stayed closed, it might of not made it everywhere 100% complete. And also, when there is water in the block and you run RV antifreeze, it can dilute that somewhat so the rating temp would likely increase a bit.

Blow out your heater hose lines too. I just use an air compressor.

I follow up by pouring a little bit of pure antifreeze (prestone) into the thermostat housing.

Some pics in this thread starting on page 7:
http://www.mastercraft.com/teamtalk/...t=51183&page=7
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Old 10-26-2018, 04:18 PM
Cody2662 Cody2662 is offline
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Well I went down to the storage unit and ran another 6 gallons through. Even I could see it was primarily red coming out of the exhaust. Next year Iíll do a better job and get the old plugs out and install new ones but Iím pretty sure Iím covered this year


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Old 10-28-2018, 04:55 PM
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Jarome Jarome is offline
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Ski-me is right in that you need to get the plugs removed this fall before freeze up. There can still be water laying the low areas of the manifold that doesn't mix with the RV antifreeze, which could freeze. Getting the water out is extremely important... adding the rv antifreeze is just a preventative measure.
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Old 10-28-2018, 05:06 PM
Cody2662 Cody2662 is offline
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Isnít the exhaust manifold one big area? I guess Iíll donít understand why the antifreeze wouldnít mix with the little bit of water that as left in there after I pulled the hoses. Thatís all the mechanic did last year and he only did 5 gallons


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Old 10-29-2018, 01:29 AM
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Jarome Jarome is offline
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well you could be ok with what youre suggesting but the procedure calls for removing those plugs and draining the water....and then adding the antifreeze. Totally up to you but, better safe than sorry is always a good strategy.
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Old 10-29-2018, 10:05 AM
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Make sure both manifolds are drained and both block plugs are drained. You can get pink out of exhaust making you think all is good, but if the Tstat was too cold, it would not of opened up. Therefore you may have unprotected water in the block.

At a minimum, be sure those four locations are drained.
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