Final Drive Implement Bolt Hole

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Clownfish
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Final Drive Implement Bolt Hole

Postby Clownfish » Thu May 05, 2016 8:53 pm

What is the best way to restore an oversize implement bolt hole in a final? The hole has been drilled and tapped for a 3/4" bolt and I would like to restore it to use a standard implement bolt. Is there something like a Heli-Coil that can be used?

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Re: Final Drive Implement Bolt Hole

Postby Barnyard » Thu May 05, 2016 9:41 pm

It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.
- Franklin D. Roosevelt -

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Re: Final Drive Implement Bolt Hole

Postby Clownfish » Thu May 05, 2016 9:55 pm

It looks like the Acme Insert might work but I can't figure out if an insert for a 5/8" bolt will work in a hole that is already drilled and tapped for a 3/4" bolt. I don't find a chart on their website showing which drill and tap size to use for a 5/8" bolt. Maybe I am not looking in the right place.

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Re: Final Drive Implement Bolt Hole

Postby Paul Van Benschoten » Fri May 06, 2016 1:26 am

The chart on page 10 of their ACME_threaded_Inserts PDF shows the external threads to by 7/8-14 for a 5/8-11 internal thread.

http://www.acmeindustrial.com/pdfs/ACME ... nserts.pdf

Edit: I should have looked further, the next page has Extra Heavy Duty inserts that use a 1"-12 external thread.
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Re: Final Drive Implement Bolt Hole

Postby Bus Driver » Sun May 08, 2016 7:41 pm

That 3/4-10 really messes up things. The tap drill for 3/4-10 by coincidence happens to be the same size as the tap drill for the 5/8-11 coil insert. So tapping for the coil insert will leave shallow threads at places for the insert to engage.
I did redo bolt holes on the torque tube with apparent success-- same mess as described above. I cleaned the retapped-for-coil threads with lacquer thinner and embedded the coil in JB Weld plus filled part of the interior. When cured, drilled out the insert interior with regular tap drill for 5/8-11 and ran the tap though the insert. The thought was that the JB would hold the insert tight to the threads that did exist. The 7/8-9 inserts were the next option is the first plan failed.
The threaded length in the final drives is probably too short for this technique

The 7/8-9 inserts are about the last resort. If one wants to disassemble the rear drives to avoid heat damage to the bearings and seals, the holes could be filled by brazing, then drilled for the 5/8-11 inserts. That also works for bolt bosses that may have a broken area.
Replacing the drives is another solution. Be sure the replacement drives have the same type brakes.
Luck favors those who are prepared

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[url=http://www.farmallcub.com/phpBB2/viewtopic.php?f=122&t=87548]1953 Farmall Cub Restoration[/URL]
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Re: Final Drive Implement Bolt Hole

Postby knightentc » Mon May 09, 2016 9:56 am

Glen,
I installed a heli-coil a while back to replace a 3/4" bolt in one of my finals. If the threads were a little shallow I couldn't tell the difference and have really torqued down on it numerous times swapping out my 3 point and draw bar. You can check out my restoration thread for some pictures. I have a kit you can borrow if you need one and can get it to Mobile if it helps.

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Re: Final Drive Implement Bolt Hole

Postby Clownfish » Tue May 10, 2016 8:56 am

knightentc,
PM sent.


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