As mentioned on other post, I managed to strip thread on one of the pinch bolts on forks even though I've always used torque wrench. How can I fix it? Helicoil has been suggested but not sure that's any option as thread is only on the back part of where it clamps? Any suggestions or had anyone had thd same problem and resolved it? All I've come up with at the mo is bolt with nylon lock nut on the back :-(
All a helicoil does is replace the thread with a new thread using an insert, so if a thread existed before there is no reason why this should not work. In my opinion they seem to produce a nice strong fix as they are steel inserts and I would assume replacing the thread on ali? Only my opinion though, and in true 675.cc fashion I am sure you will get some good suggestions by the end of the night lol
Cable Tie ? FWIW I would certainly helicoil it. The longer bolt & nyloc nut would work fine I guess, but would niggle me
Don't faf about. Get the welder out helicoil will be fine unless you can open the hole and re thread it to a slightly larger size.
Just spoken to local bike shop and they say you can't helicoil from the back as thread would be going the wrong way. Also the only way to do from the front would be to enlarge hole in front section of clamp allowing helicoil to be put in the correct way, which will leave pinch bolt loose in front section and helicoil would be floating as thread goes all the way through clamp. Looks like new fork bottom :-( any other ideas??
Are the threads damaged or completely stripped? If they are only damaged you could just run a tap through them
Have to say 180ade, I just don't see what he means. :? If you hold a nut in one hand, you can thread a bolt into it from either side. Why would a Helicoil be any different? Do you want me to have a play around with my Helicoil kit tonight.? (If I'm wrong then I suspect the answer may relate to Dino's Masters Doctorate )
Helicoil if the ally will take it otherwise +1 on the locknut and allen bolt idea (Good quality s-steel of course), and to stop it looking odd put one in the opposit hole (other fork leg) exactly the same. Oh forgot to add- yes thats twaddle about the helicoil from the back - an anti clockwise OR clockwise thread remains the same whichever way it goes in - simples! GOOD LUCK!!!
Thinking of it that way your right it should work. Another worry I've got is a helicoil works well on blind holes as it won't twist out the bottom, so may be an issue on this occasion with changing wheels all the time. Using a longer bolt and nut at the mo just wanted a better solution. May look at tapping both holes out to M10 gauge if I can get the local garage to do it.
For this sort of thing take it to a local engineering shop they would be better equipped to do the job. Helicoils normally are stronger than the original as the outside thread is larger and the inserts are harder. We have some parts at work helicoiled for this reason. Unfortunately I only have M4 and M14.
I've found helicoil kits online quite cheap. As I mentioned before will it stay in place with frequent use or can it be glued in place? Also found something called a timesert which is a threaded barrel as opposed to a spring which is meant to be stronger and can be glued. Can't find supplied in uk yet but may be a better option.
Took fork to JHS in Bristol today and they've sorted it. Drilled out and retreaded both holes and used timeserts. They said the same as other local bike garage that helicoils wouldn't work in this situation as it couldnt be turned in from the front. Timeserts are meant to be the better and stronger option...time will tell I guess.
these are what we use , we find them better than helicoil and the aerospace / MOD specify these for inserting into aluminium http://www.specialty-fasteners.co.uk/ca ... ocatid=144
