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Old 12-31-2017, 01:42 PM   #1
hardtimes
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Default thread renovation ?

I'm working with antique aluminum parts, removing brass plugs frozen with time 80+ yrs time. Feeling lucky to have removed some parts, so far, without breaking any casting. Aluminum oxide has made the bond and has indicated that the aluminum threads should be cleaned.
If I do not have right sized taps for the, too large hole, do you know of any way to clean these alum threads without damage ? I will put some lube on reassembly to help prevent recurring problem.
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Old 12-31-2017, 01:46 PM   #2
cas3
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Default Re: thread renovation ?

you get a bolt that same size and cut some slices in it with the whizz wheel. you have now made a thread chaser!
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Old 12-31-2017, 01:57 PM   #3
hardtimes
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Default Re: thread renovation ?

Quote:
Originally Posted by cas3 View Post
you get a bolt that same size and cut some slices in it with the whizz wheel. you have now made a thread chaser!
Great idea, I'll think on that one and look for bolt !
Also, wondering will any 'chemical' dissolve the oxide and not harm thread ?
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Old 12-31-2017, 05:57 PM   #4
glennpm
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Default Re: thread renovation ?

Good idea that cas3 has. I have one of these kits which is hardened steel that is configured the same as he mentioned. This kit works very well!

http://www.sears.com/craftsman-48-pc...p-00942275000P
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Old 12-31-2017, 06:35 PM   #5
19Fordy
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Default Re: thread renovation ?

Here's a whole bunch of ideas on how to remove aluminum oxide without
damaging the aluminum.

https://www.google.com/search?ei=OXN....0.aRtxl_zyFL0
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Old 01-01-2018, 05:29 PM   #6
hardtimes
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Default Re: thread renovation ?

Quote:
Originally Posted by 19Fordy View Post
Here's a whole bunch of ideas on how to remove aluminum oxide without
damaging the aluminum.

https://www.google.com/search?ei=OXN....0.aRtxl_zyFL0
Oooh, that will work, thanks for that !
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Old 12-31-2017, 06:57 PM   #7
rotorwrench
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Default Re: thread renovation ?

If they are US nation pipe thread, you could get NPT taps for most sizes. If they are bolt thread national fine or course, the thread chasers will work or an old bolt with some flutes cut into it. Steel wire brushes like the ones used to clean battery terminals may also work. It just depends on what size they are.
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Old 01-01-2018, 02:17 PM   #8
grumppyoldman
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Default Re: thread renovation ?

If the hole's are already too large, you can repair them with a Helicoil kit. They are sold at most auto part's stores. you tap the hole with a special tap and install the helicoil for the proper size bolt. Al
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