Technical & Reference Section > Tech and Restoration

Retaping crank axles

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YGT:
anyone done this?
I have a set of cranks which the bolt has snapped in the axle due to way too much locktite ..... anyone ever tried to fix something like this?

dj_benice:
tap and dye set stylee?  re-did the threads on a stem I had that was buggered turned out okay as I got away with re-tapping and just cleaning out threads at the size they where, if they are proper boogered you will need to re-cut to a slightly larger set, as long as there is enough meat there you should be o.k.  :daumenhoch:

SteveG:
The axles are normally hardened so tapping them (other than cleaning the thread up) will be a problem.
If you heat it up with a blowtorch the loctite will soften, you will then need to used an easy out to get the broken bit out. You might be able to tap it round with a center punch if its near the top.

TwoBobRob:
Yeah, I've done an axle.  Quite tough as they and the bolts are hardened.  But definately do-able.  Try a high quality easyout or other removal system first. Often once drilled, they relax/collapse just enough that they will wind back out.  If you have access a pillar drill then don't worry, get drilling!  Its likely the tap will end up chasing out the original thread and then you're good to go.  Be sure to find out precisely what pitch you need   ;) you can get away with a very slightly larger drill bit than the one used in the factory and this will aid your thread chasing. Proceed with caution.

For your info, there are varying grades of threadlock - you will find one designed for frequent loosening/tightening. That's the kid for next time   :)

TwoBobRob:
Note to self;   learn to type faster............................  :-[ ;D

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