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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  how do i repair the thread on a 1 piece crank??
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Author Topic: how do i repair the thread on a 1 piece crank??  (Read 588 times)

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staple123

  • Guest
how do i repair the thread on a 1 piece crank??
« on: July 31, 2007, 02:47 PM »
i have a sugino 1 piece which is getting rare but i want to save it, can anybody repair the thread on it ir knows how to'thanks

DR VINOAH

  • Guest
Re: how do i repair the thread on a 1 piece crank??
« Reply #1 on: July 31, 2007, 02:51 PM »
how far gone is the thread?

staple123

  • Guest
Re: how do i repair the thread on a 1 piece crank??
« Reply #2 on: July 31, 2007, 02:54 PM »
two little threads that is all the rest is perfect!any help? :-\

DR VINOAH

  • Guest
Re: how do i repair the thread on a 1 piece crank??
« Reply #3 on: July 31, 2007, 03:07 PM »
the 2 that are shot
are they on the exposed part?

ie when the whole crank is assenbled on bike
you have a couple of threads showing

if so

i suggest a fine file set
be a tad easy with the filling
you dont really wanna lose much of it
coz you still need the nuts to do up tight

staple123

  • Guest
Re: how do i repair the thread on a 1 piece crank??
« Reply #4 on: July 31, 2007, 03:16 PM »
yeah , opposite the chainwheel side??if so thats it and i will try that now!cheers

Olliecw

  • Guest
Re: how do i repair the thread on a 1 piece crank??
« Reply #5 on: August 02, 2007, 11:30 PM »
If the thread is well knackerd you can get a heli coil put in there.It basically replaces the thread.Don't know if it will stand the pressure ..It should. I had one done on a brake resevior on my racing kart and that held out under very high pressure..It could be a last resort if all else fails :daumenhoch:
Ollie

phantom 19

  • Guest
Re: how do i repair the thread on a 1 piece crank??
« Reply #6 on: August 03, 2007, 06:48 PM »
A poper thread file is the answer.

PS you cant helicoil external threads only internal ones. A helicoil is generally stronger than the original thread also.

Offline Philbert

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Re: how do i repair the thread on a 1 piece crank??
« Reply #7 on: August 03, 2007, 11:58 PM »
any semi decent machinist or bike shop should be able to sort that out with a 'die' kit in a jiffy! or if you wnted to do it yourself there readily available in places like halfords or any bike shop who deals with shimano (madison) should be able to get a nice park tool kit.

RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  how do i repair the thread on a 1 piece crank??
 

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