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Restoration & Repair Tips Board

Getting bolts out

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x22

11-18-2007 18:23:04




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I have a syrup mill that sat in the mud for a few decades. I need to remove the bolts that adjust the rollers but they are frozen solid. They thread into the cast iron case about 3 inches and they are 3/4 inch bolts,grade 8.What is the best way to remove them?




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trucker40

11-30-2007 11:42:47




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 Re: Getting bolts out in reply to x22, 11-18-2007 18:23:04  
If you have somebody to help you,try putting some pressure on your wrench,a 6 point if you have it,then have your helper hit the head of the bolt as you try to turn it,or hit the wrench if you cant get to the head of the bolt.I think on cast iron you would heat the bolt and try and turn it with it hot.Sometimes it does work to try and tighten it a little before trying to loosen it.If you can get to the cast iron that its screwed into you might even heat that some,not real hot,but warm it up good.I dont think you want to cool off the cast iron with water.If that doesnt work then heat up the bolt,thats about all thats left.If none of that worked,if you are real good with a torch,and if there are washers under the heads of those bolts,you can cut the heads of the bolts off,take it apart.Then when its apart you can weld a big nut on the bolt and turn it,or put as big a pipe wrench on it that you can on the bolts if they stick out far enough and try that.Sometimes that might work if you can get a big wrench that will bite into the bolt and turn it,might need to put a pipe on the handle of the wrench to break it loose maybe.If you do that,with the pipe,you need to watch that you dont break the cast,try it slow.

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George Andreasen

11-19-2007 06:49:11




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 Re: Getting bolts out in reply to x22, 11-18-2007 18:23:04  
I need to add something to the last post...and maybe correct a misconception.
Yes, heat the bolt to a nice cherry red...then LET IT COOL! Wrapping a wet rag on it will speed things up. Reason: heated metal expands, locking it even tighter in the hole. As it cools it will contract to slightly SMALLER and become loose enough to start it out. Same thing (in reverse) applies to a nut on a stud. Heat it to expand it, then take it off hot. Done this many times on stationary engines and old machinery. The situation has to be very bad for it to fail!

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MarkB_MI

11-20-2007 03:38:41




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 Re: Getting bolts out in reply to George Andreasen, 11-19-2007 06:49:11  
George, I hear what you're saying, and it makes sense, but my experience with removing stuck bolts has been that they always come out easier when they're hot.

I'm not entirely certain why this is, but my guess is that the coefficient of friction changes dramatically when the metal (and rust) gets above a certain temperature. I just removed a small pipe plug from a casting the other day: I broke a wrench on it trying to remove it cold, then I heated it up and it came out with almost no effort at all. If it was just a matter of expansion, that plug should have gotten tighter, not looser.

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old timer in ohio

11-19-2007 04:23:30




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 Re: Getting bolts out in reply to x22, 11-18-2007 18:23:04  
Hey there x22(don't know your name)
These tricks have worked for me many-many times.First,tap on the
head of the bolt;(on the end,not
the side),next tighten the bolt,
sounds stupid,but try it,then
loosen.Lots of luck!! Bob
God Bless



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MarkB_MI

11-18-2007 18:53:26




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 Re: Getting bolts out in reply to x22, 11-18-2007 18:23:04  
Heat, and lots of it.

With an acetylene torch, apply heat directly to a bolt head until it start to turn red, then quickly put a wrench on it and turn. Reapply heat if the bolt starts to seize up.

After this treatment, those bolts will no longer be grade eights and will need to be replaced.



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Andre Moen - Klondike Rep

12-13-2007 09:30:46




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 Re: Getting bolts out in reply to MarkB_MI, 11-18-2007 18:53:26  
In cases where you have a twisted off bolt or stud. Here is what workes for me 90% of the time. Weld a washer (through the hole)to the item then a nut(outside) heat up the part(use judgement on how much)Put wrench on nut and set ice cube to shrink and slowely turning it out. repeat if it gets tight. Works wonders on Manifold bolts or studs. Elimininates drilling and possible damaging threads. Andy
P.S. wire feed welder works the best.

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