Does anyone know if there is such a beast as a reverse thread crank extractor tool.
Here is my problem. I have Powercranks with a taper square axle. The drive side PC is reverse thread, and the way the crank is normally extracted is to loosen the bolt that holds the PC to the axle, while keeping the dust cap on. As the bolt loosens, it applies pressure to the dust cap, pulling it away from the axle.
Last nite after a long day at work and coaching my son’s soccer team, I proceeded with the removal of my PC’s in prep for my first tri of the year (Muskoka). In a low state of energy, I did not insert the dust cap all the way and as I loosen the bolt, it was only attached to the last couple of threads as it pushed against the dust cap. Instead of extracting the crank, I stripped the axle of any useful threads for extraction.
I took my bike to the LBS, and it appears that the only option might be to cut the axle with a saw, replace the BB and install my conventional cranks. In this scenario, I have to lose the “core” adapter for the PC and replace it (the crank and clutch are obvioiusly still useful).
If I can actually get a reverse thread crank extractor that works on tapered square axles, then I can avoid this scenario.
Help !!! I have to race on Sunday, so I am pretty well runninig out of time and fear that the saw may be the only way to go.
Can’t help you on a technical front. All I know is that, I think that I am slowly learning that for some of these more “advanced” bike repair things it’s best to take it to an LBS that you can trust to do the work.
I used to do all my own bike work, but recently I have just dropped the bike off like I would drop my car off for repair and let the shop handle it - saves a huge amount of time, energy and frustration, but not money.
I hope that you can figure something out for Muskoka.
Fleck, right now it is looking like the LBS will have to take the saw to the axle and replace the existing 5 year old bottom bracket (that is OK), and then I’ll have to pay Frank Day some $$$ to get a new adaptor for the right side, unless of course there is some means of drilling out the remaining piece of the axle without destroying the PC core (unlikely).
Once the spindle is sawed off, if someone is careful you might be able to drive the square part out of the crank,do not hit around the square part of the spindle, go get you a long bolt that will thread into the threads that used to hold the crank on this will keep from expanding the end of the spindle from beating on it,
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Randall, I did not get the whole explanation down. Basically, once the axle is sawed off, then are you saying that I should put a long bolt into the threaded part of the axle and than bang down on that bolt really hard with a mallet or something until the piece pops out the “wide side” of the taper square hole ?
yes i talk or write but it never come out right,be careful not to miss and hit the crank or a hand it might come out it might help to sit the crank on something thats not going to scar the crank and give it a ctap,again being very careful,plus there are other ways to get the spindle out,but try this first
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Powercranks just called me and told me to send in the spindle adaptor with the spindle stub stuck in it and they will get it out for me or replace it ! Now I just need my LBS to take a saw to the existing axle and get the bike ready for my race this weekend !
Well, it looks like the mechanic with some reasonable experience in my LBS got to my bike after 5 other inexperienced guys had failed. He just inserted a longer bolt in my axle which went in deep enough into the axle where there were sufficient remaining threads. This resulted in enough threads to extract the crank despite the last few rounds of threads being stripped! Whew !