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Tool Talk Discussion Forum

How to break rust bond

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ldj

10-09-2019 16:45:43




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My old screw type mechanical press is rusted together and can't get it to turn. I have used phosphoric acid, PB Blaster, WD40. I soaked good with one then cleaned it off good and tried the other, no luck so far. I have thought about taking it to a powder coat place and see if they would put in their oven. I think they go up to 400* and don't know it that would brake the rust bond, any one know? Any other ideas appreciated. I don't want to heat with torch because I afraid I can't heat even enough to keep from cracking. It is mostly cast iron

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Dick L

10-10-2019 14:12:09




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
Forgot all the cast iron skillets and cook ware. Bib cast iron kettles to scald hogs and then to turn the fat into lard.



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dr sportster

10-10-2019 12:57:58




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
An iron casting should not crack with some heat . Don't be afraid of a torch if you need it. Heat- wax



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calvin innes

10-10-2019 12:48:32




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
I was working on a dozer head with several broken studs years ago and a fella told me to heat the head and put bees wax on the broken studs. I didn't have bees wax so used a candle and I was amazed how easily they came out. The heat doesn't need to be terribly hot, not even "spit-sizzling hot" as dad used to say. It is amazing how well the wax flows into the voids around the rust and things begin to work on out. Been doing this for years. Hope this helps.

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Mutt and Jeff

10-10-2019 10:27:59




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
build a fire under it
big bowl or bucket with vent holes around the lower rim

fire hardwood, coal tend and roast it

maybe even squirt oil at it and watch the flames and smoke

work it back and forth till free



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Determined

10-10-2019 07:46:21




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
Iodine



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Mike M

10-10-2019 04:57:53




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
Don't be in a hurry. Soak it in a bucket of diesel fuel and set it back in the corner and check on it in a month or more.



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CCer

10-10-2019 00:26:29




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
My GO-TO tool is a steam cleaner, Heat and water pressure has loosened many seized threads for me. With tapping and turning.



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4play

10-09-2019 22:23:47




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
Did the phosphoric acid look like it did much? That is a pretty weak acid and if you want to try another acid then I would get muriatic acid. Just keep away from the fumes and spillage.



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da.bees

10-09-2019 21:07:50




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
Short of red hot which is not a good idea for this,much of the benefit of heating is pulling oil in as parts cool. Put some penetrating oil on joint where parts meet and you would like oil to get between parts. Quickly heat part until you see oil boil or smoke,stop heating and keep joint wet with penetrating oil until part cools. If time allows,do this ever 2-8 hours for as many days as you can afford. Keep trying to wiggle it. Once you get the smallest movement,things will start going better. At some point oil will seep into joint as it's applied. Time and patience is the key. It took a long time getting in that shape,it will take time to get it back.

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NC wayne

10-09-2019 18:17:34




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
As others have said, heat and some penetrant work, but they leave out another important thing, vibration.

Once you have the first two going,take an appropriately sized hammer, and tap, tap, tap, around the threaded area. As long as you are tapping, and not HAMMERING, you shouldn't have to worry about breaking anything, but the vibration will work on the bond.

I've had stuck bolts, and hydraulic fittings, that I've had wrenches and cheaters on, that wouldn't break loose. I'd hit them with a hammer a few times, (in tight places I've used a small air hammer and hold it back so it just taps) and with the hydraulic fittings especially, taken them off with my fingers afterwards.

Good luck.

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MarkB_MI

10-09-2019 17:32:40




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
400°F isn't nearly hot enough to break rusted iron loose. Don't try to heat the casting with your torch because it will take way too much heat. Focus your acetylene torch on the screw close to where it enters and exits the casting.



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Jeff nwoh

10-09-2019 17:29:31




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
I've heated many a cast iron piece red hot in one area to get a bolt out. Manifolds, heads, etc... I've never had one crack. I wouldn't be afraid to put the heat to it.



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Dick L

10-10-2019 04:00:19




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 Re: How to break rust bond in reply to Jeff nwoh, 10-09-2019 17:29:31  
Not many here have heated their house with a coal burning cast iron pot bellied stove that was red hot all winter long. Or the cast iron cook stove that not only cooked the food and was the source of all hot water as well as heated the kitchen where you would get dressed in sub zero mornings.



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TimV

10-09-2019 16:58:01




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 Re: How to break rust bond in reply to ldj, 10-09-2019 16:45:43  
Lots of possibilities, and every has their favorite magic elixir, but don't be afraid of a bit of heat. You WANT to heat it unevenly--that's what breaks the rust bond. Spray it up with whatever you want (PB Blaster's my go-to for such things, but to each their own) and go around it with a propane torch. Keep heating, cooling, spraying, and working the handle and sooner or later she'll turn. Sometimes candle wax dripped on the threads and heated will work its way into the mechanism.

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neverfear

10-09-2019 17:08:10




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 Re: How to break rust bond in reply to TimV, 10-09-2019 16:58:01  
X2 on heat and candle wax.



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Bob Harvey

10-09-2019 19:26:00




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 Re: How to break rust bond in reply to neverfear, 10-09-2019 17:08:10  
X 17 Heat and wax. Will not happen instantly. Got an air chisel ? Use it to vibrate.



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