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Farmall & IHC Tractors Discussion Forum
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To twist or not to twist

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Thomas D Windso

06-29-2007 19:27:42




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I have an H rear end here and I want to remove the tramsmission cover. Most of the bolts came out. 3 of them are going to twist off if I keep going. The top is so thick I dont think I will ever get any heat down in there. Is there a secret here. Should I go ahead and twist them off and remove the cover then apply heat and remove them with vice grips? That is what I am thinking about doing unless a better idea comes??!!

TW

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Billpa

06-30-2007 09:33:26




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 Re: To twist or not to twist in reply to Thomas D Windsor, 06-29-2007 19:27:42  

I think you might find out that the bolt is frezen in the cover not the housing whitch takes a different approach



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Bob Kerr

06-29-2007 19:45:32




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 Re: To twist or not to twist in reply to Thomas D Windsor, 06-29-2007 19:27:42  
And old steam engine guy told he how he got stuck bolts out of boilers and trust me, bolts in boilers can be the worst to get out!. You take a torch and heat only the bolt, gently until it is a "low red" hot and keep it that way for a few min say 3-5 min. don't heat the part it is stuck in, just let the heat from the stuck bolt "soak" into the surrounding area. then take a wet rag (wear gloves for this!)or an ice cube and cool the bolt and with a hammer smack the bolt on top a couple times to jar it and the take it out. Once it moves at little go the other way and then back and forth until it unscrews. Since I have been using that trick I have twisted of very few bolts. When I put them back together I put a little steam engine oil("lard oil") or gear oil on the threads, That can save you trouble if you have to take it back apart down the road. dry threads will stick terrible if assembled and just the tiniest bit of water gets in say from washing the tractor.

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GeneMO

06-30-2007 07:59:36




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 Re: To twist or not to twist in reply to Bob Kerr, 06-29-2007 19:45:32  
You mentioning lard brings back memories. My dad kept a container of lard by the drill press and also used it when cutting threads. The lard is still there by the drill press where he left it 4 years ago, before he passed away.

Gene



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Bob Kerr

06-30-2007 20:53:46




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 Re: To twist or not to twist in reply to GeneMO, 06-30-2007 07:59:36  
Hi Gene, I had heard a long time ago that IH and a bunch of other maufactuers used lard oil for machining and cutting threads. When I took apart my 10-20 that sat outside for 30-40 years I only twisted off 3 bolts total on it and all the threads were still in good shape even the ones in the radiator!. If I replace a bolt with one that is plated, I remove the plating with acid, those plated bolts always get stuck bad and twist off especially if put together dry. My Grandpa used lard also, unsalted of course!.

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K.B.-826

06-29-2007 19:38:47




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 Re: To twist or not to twist in reply to Thomas D Windsor, 06-29-2007 19:27:42  
If you twist them off, you run the risk of breaking them below the surface of the trans housing. Then you'll be drilling them out. I'd cut the heads off and lift the cover off. Weld nuts on top of the bolts, little penetrating oil, time, heat, and they'll come right out.



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