Removing crank with stripped thread?

[Tad]

sounds harsh but if you hacksaw alloy arm ensuring not to go thorugh to bb spindle and avoid hitting frame, then large screwdriver or similar and hey presto, I have done this many times

I usualy opt for the above method.

Don't worry about the BB spindle, it'll be hardened steel (unless it's an exotic one) trying to saw through it will only knacker you out and blunt your saw.

 

[mikee]

angle grinder ?

 

[cchris2lou]

if you can get one side out , insert a 15 spanner between damaged crank and the frame . ( tight space so a pedal spanner should do the trick ) .

undo the bottom bracket and the crank should come off on the other side .

 

[Cristian-T]

This has worked every time ive had this problem come into my bikeshop (Along with the past 18years)

Turn the bike upside down, or in a workstand, with the frame in best position, using the biggest socket extension bar you can get your hands on (nice & heavy) place it behind the crank (wherever) & apply with heavy duty hammer.

Tough jobs = big tools. If this dont work, apply blowtorch heat for a good 5-10 mins before above operation.

good luck anyways

 

[dyna-ti]

Is all the thread gone? if not spray some plusgas into the taper,then screw it in till it wont go in any further
I mean really screw it in :shock: two hands and so much force you fear it will snap the shifting spanner.Then try to undo it

Or ride it about without a fixing bolt

 

[windsorharrier]

Hey, I've got a new one for this problem. I tried all the above with a combined crank and rings which made it worse. Saws, big hammers, drills - everything.

The only thing that got it off in the end was (and this only works if one of the arms is not stripped) take the good arm off and screw the bottom bracket out and the opposite crank will fall off (after being loosened with the above methods!)

Hope this helps.