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Post by steveuk on Oct 10, 2009 11:00:59 GMT -5
hi, does anyone know the thread size of the generator rotor retaining bolt, i need to clean up the thread in the end of the shaft.
i think its 12 x 1.25 is this correct my taps are either 12 x 1.5 or 12 x 1.75.
Steve
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Post by Jess on Oct 10, 2009 13:57:59 GMT -5
12mm x 1.25 pitch... Taps and dies are hard to find in that size, and expensive when you do find them...
Best,
Jess
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Post by Jess on Oct 10, 2009 19:42:06 GMT -5
P.S. be sure to use locktite when you put her back together... Having the Rotor come off at speed really sucks... (ask me how I know... go ahead) Best, Jess
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Post by steveuk on Oct 11, 2009 8:24:51 GMT -5
hi jess
go on then how do you know?
steve
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Post by Jess on Oct 11, 2009 19:47:15 GMT -5
Suffice it to say that it make a really bad noise and then destroys the stator... Bad, and expensive day... Best, Jess
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Post by suzsmokeyallan on Oct 11, 2009 20:54:21 GMT -5
If the damage is not too bad and only for a few threads you can use a hardened steel bolt of that same size and cut some slots lengthwise up the beginning of the bolts shaft. Dressing it on a stone so it also has a gentle taper at the starting thread edge helps to make it align properly when screwing it in. You should also apply a bit of oil to help lube it and work the bolt slowly in and then back it off checking the way its cleaning the damaged thread as you go. This is all subject to just how bad the actual damage is, short of buying a tap of that hard to find size to realign the threads in that section.
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Post by Jess on Oct 11, 2009 21:54:57 GMT -5
Very good point Allan...
I have used that trick with bizarre sizes. I had a Vincent head that the exhaust threads were slightly boogered up.
I used an old exhaust nut and cut some diagonal slots in it. It took several hours of working it back and forth to straighten the threads, but when it was done, it worked well.
Good tip, and one that had slipped my mind.
Thanks!
Jess
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