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stripped threads/ crank removal(10 posts)

stripped threads/ crank removaliatola-rocnrola
Oct 8, 2003 6:32 PM
the threads on a set of ultegra cranks are stripped, the park tool can't catch enough thread to hold so as i can pull off the crank. i tried chasing the threads with a tap, 22mm x 1 , and i can't cut enough thread, how can i remove the crank without wrecking the bb or anything, the crank in question is drive side. should i get a three arm bearing puller? or some sort of pry bar?
If it were me..the bull
Oct 8, 2003 6:53 PM
I would consider the cranks toast and cut them off with my whiz wheel.
Not like youre going to install them again right.
what kind of tap did you usewilsonc
Oct 8, 2003 7:50 PM
did you use a bottoming tap or a taper tap? you probably used a taper tap, but what you should use is a bottoming tap...
what kind of tap did you useboyd2
Oct 9, 2003 7:45 AM
You can make a bottoming tap out of a taper tap by grinding off the taper. Keep the tap cool by dipping in water while grinding so that you don't destroy the temper.

Other then that I once thought that you could get a crank off by removing the bolt and going for a ride. I here from other folks on this board that it is not true. Perhaps it is worth a try though? It is free, and you get to ride.
what kind of tap did you useiatola-rocnrola
Oct 9, 2003 8:00 AM
i did use a bottoming tap. there really isn't any hope of saving the threads, i could try and tap out to a larger size thread, but then i would need to make a different puller. i'm looking for a quick way to get these off, prying? hammering?? cutting them off was already suggested.
what kind of tap did you usecurlybike
Oct 9, 2003 8:11 AM
One method is to go down to your local auto garage and get them to use a tie rod fork tool to pop it off.
CRR
re: stripped threads/ crank removaleddie m
Oct 9, 2003 12:31 PM
If you want to save the crank, try replacing the bolt with a bolt and cap designed to emoce the crank without a puller. Put the new cap in with Loctite 680 (not the red stuff). That might work, but if it does that new cap and bolt will never come out.
Saw, gear puller, or machine shop.Kerry Irons
Oct 9, 2003 5:02 PM
You can saw them off, remove with a gear puller, or go to any machine shop and they'll have the gear puller.
If it's an old crankset...satanas
Oct 10, 2003 12:52 AM
...with a non-cartridge BB, remove the crank which isn't stripped (assuming there is one), and the cup on that side, then loosen the bolt on the crank you are trying to remove, support the BB shell on a vice, and hit the bolt *very hard* with a big hammer and punch.

This will drive the axle out of the crankarm. Don't replace the BB with a cartridge unit (except one with removable cups like Phil Wood) unless you are prepared to saw things to disassemble next time.
LBS may have a kitB2
Oct 10, 2003 5:30 AM
I forget who makes em, but basically they tap to a larger size and provide a new set of extractor thingys that thread on over the crank bolts. The problem is that the cost is almost as much as buy a new set of Ultegra cranks.

Good Luck,
Bryan