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Farmall & IHC Tractors Discussion Forum
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Threads in cast wore out

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Jimer

10-10-2006 20:37:00




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Noticed a bolt about 1/2" out on the bracket that mounts the 2 pt on the back of my 300u. Took the bracket off, turns out 2 or 3 of the 6 bolt holes do not hold the studs. Tried drilling and tapping to a 9/16" from 1/2", but pretty tuff stuf. Looking forward to hearing what the experienced people on this site do.
Thank You for reading.




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Easy1

10-12-2006 17:13:03




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
Believe it or not hand soap makes a pretty good tapping compound. Lots of shops use it.



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El Toro

10-12-2006 18:25:08




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 Re: Threads in cast wore out in reply to Easy1, 10-12-2006 17:13:03  
We used soap when tapping aluminun and it made nice threads. Hal



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Mike Van

10-11-2006 18:14:07




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
My 2 cents - I've had better luck tapping using CRC 5-56 instead of oil, WD 40 was just the opposite, tap would lock right up.



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Keith-OR

10-11-2006 14:47:32




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
Jimer, my Wells Tool tap and die set, instruction says use good cutting oil or Lard oil... Lubricating oil will cause torn threads. If your going to drill and tap I would go to 5/8 as these are more readly available...HTH

Keith & Shawn



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the tractor vet

10-11-2006 07:17:23




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
the vary best repair for that is a KEEN-SERT they use a standard drill and a standard tap and once locked in they are stronger then the ORG.



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SuperA-Tx

10-11-2006 06:57:53




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
If you use helio coils you have to drill them out to a bigger size anyway so just go ahead and tap them to 3/4. If its cast use course thread, its suppose to hold better in cast. Use a 21/32 drill bit then tap it.

I would also use a harder bolt.



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Andy Martin

10-11-2006 05:24:02




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
The first step is to always try a new bolt. Lots of times the threads on both bolt and hole will be worn, but a new bolt holds well and avoids drilling, tapping, etc.



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El Toro

10-11-2006 04:02:25




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
I would use the heli coils. Hal
PS: We have used keenserts too.



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gene bender

10-11-2006 03:30:57




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
LOCTITE has some products that work well. If its a stud JB weld could also work it depends on how much force will be applied to affected hole. The hole can always be drilled oversize later.



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Paul G. in Mn

10-11-2006 03:03:17




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
I had the front frame rail bolt that were striped in my boster and helicoiled it with no problem and seemed to work really well



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John T

10-10-2006 20:46:54




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 Re: Threads in cast wore out in reply to Jimer, 10-10-2006 20:37:00  
One alternative to drilling n tapping is heli coils, but you still gotta have the corect oversized hole in the first place to insert the coil so not sure if thats any better in your situation????? ?? i.e. if you gotta drill anyway go ahead n drill n tap ???

I bought a set of titanium drill bits and those with lots of oil during drilling helps some. If you get the correct pilot hole and use the good instead of cheap soft tap real slowwwww and oiled and in n out in n out you may eventually get r done..... ..

John T

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Wardner

10-10-2006 21:04:19




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 Re: Threads in cast wore out in reply to John T, 10-10-2006 20:46:54  
A Heli-Coil installation kit will give you the correct drill size, tap, inserts, and installation tool. Cast iron is not hard to tap unless the hole is undersized. High quality tapping fluids like Tap-Ease make the job easy. Incidentally, I have heard that lard is still the best tapping lubricant for cast iron but have never used it.

A friend of mine ripped out the three bolts underneath the rear frame that secure the U-shaped bracket for the fast hitch bail on a 460. He did not want to go to the expense of Heli-Coils so we drilled to the next tap size. I think it was 3/4". We did all the work on our backs drilling and tapping upwards. The tractor has been fine ever since.

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randy hall

10-11-2006 07:43:17




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 Re: Threads in cast wore out in reply to Wardner, 10-10-2006 21:04:19  
wardner, where i work they still use lard oil when turning the big cranks [up to 35 tons] on the sixty inch betts lathe.



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