How do you remove a stripped crank arm?

[dirttorpedo]

So I picked up the new parts for the renovation of my Hillside commuter/rigid mountain bike. Started pulling off the old parts and putting on the new. Just my luck - I stripped the threads on the non-drive side crank arm. I don't care about the bb, I just want the thing off without damaging the frame so I can install the new bb/crank set.

I have a fair selection of common tools. Any advice?

 

[racer x]

Try riding the bike with the bolt out the crank arm and use some oil as well

Should come off easy but could damage the crank arm splines but mite not. they sound probably damaged now

 

[sherlylock]

I managed to remove a crank arm with a stripped thread recently using a bearing puller. Worked a treat!

 

[eejoor]

if you don't have a bearing puller you can use 2 chissels between the cranck arm and bb to push the cranck arm off. it will leave some markings on the cranck and bb, but not so you can't use them anymore

grtz, danny

 

[Barneyballbags]

Glad I just stumbled across this thread because I've done exactly the same thing to the drive side of a set of LX cranks! :evil:

 

[spoon138]

try putting a bolt in the bb hole just a few threads, then wedge something (like chisels or screwdrivers maybe even wood?)) between the crank arm and bb shell (just tap em in though) and then smack the end of the bolt you screwed in, itll knacker the bb probably but should shock the crank off with out damaging the crank and frame so much.
Maybe...( just what id try)
(bearing puller or something would obviously be better).

 

[02gf74]

Try riding the bike with the bolt out the crank arm and use some oil as well

Should come off easy but could damage the crank arm splines but mite not. they sound probably damaged now

Sounds like it is this square taper type BB.

Fit and threadlock the the bolt so it is one or two threads undone then ried the bke - the crank will loosen but the bolt will stop if coming off.

Or hacksaw a slot in the crank arm, then hammer a thin chisel in the slot to split the crank.

 

[mikee]

ge a 23 mm puller made up and tap the crank arms out to 23mm
then extract as normal

if your really smart you make a 23mm tap with an m12 thread thru the middle and use this as the extractor as well

 

[dirttorpedo]

Thanks for the ideas guys. I ended up borrowing a friends sawzall and cut the crank arm below the axel then grabbed the BFH and hammered it until it split off.

Then I found out the Octolink bb's use a different extractor/installation tool so back to the LBS to drop some more $.

 

[Matthews]

Thanks for the ideas guys. I ended up borrowing a friends sawzall and cut the crank arm below the axel then grabbed the BFH and hammered it until it split off.

Then I found out the Octolink bb's use a different extractor/installation tool so back to the LBS to drop some more $.

I found that out a couple of weeks ago too, got out old trusty BB extractor and it wouldn't fit over the BB doh, down to lbs for new tool.