Sheared off crank arm bolt?

[Botts101]

Has anyone broken off one of the self extracting crank arm bolts? I just did....now what? Grind the crank arm off?

 

[njn]

picture?

 

[Botts101]

picture?

The sheared bolt is behind the crank which is still on the bike - I think I'm going to need to cut it off and the extract bolt. PITA

 

[Troutwrestler]

Is there anyway you can use a hub puller to non-destructively remove the crank?

 

[TommyBall]

I saw this post and thought I needed to register! If your confident at using tools I would try to drill the bolt and use an extractor. If not, if you have a machine shop or engineering shop near you they would be able to sort you out. It might save the crank arm and other possible damage.

Hello I'm Tommy. ?

 

[ccrdave]

is this isis fit? i think the outer nut the bit the bolt pushes against to make the extraction also will unscrew that should give you clear space to put a puller on the crank arm and just pull it off

 

[Botts101]

I saw this post and thought I needed to register! If your confident at using tools I would try to drill the bolt and use an extractor. If not, if you have a machine shop or engineering shop near you they would be able to sort you out. It might save the crank arm and other possible damage.

Hello I'm Tommy. ?

Thanks guys. Yea I guess I could drill it out but it would ruin the crank. I thought of a puller but the pullers push bolt would 'push' pretty hard on the Brose motor spline. I reached out to Praxis and they tried to up-sell me the new $$$ Carbon cranks. lol

 

[Botts101]

is this isis fit? i think the outer nut the bit the bolt pushes against to make the extraction also will unscrew that should give you clear space to put a puller on the crank arm and just pull it off

I wonder if this would work? I guess if the threads worked it could?

 

[Botts101]

Guys. Would this work to remove crank? Any ideas on thread pitch?

 

[TommyBall]

Is the hex part of it floating inside the crank?

 

[Brianjonesphoto]

Have you removed the treaded on top cap from the self extractor? Photos would be very helpful. I doubt the bolt broke at the head. It's likely on the threaded below the shoulder. If so removing the top cap of the bolt will get the broken bits out and a regular crank puller like the one pictured should work to get the cranks off. The bolt is another story. DO NOT use a screw extractor as a first line defense. Heat and left hand drill bit first. Extractors break too easy if not used carefully then you are super screwed.

This is what the bolt looks like unbroken. It's 2 pieces. If it's broken you should be able to get some pieces out and show us what you are working with.

 

[Botts101]

Have you removed the treaded on top cap from the self extractor? Photos would be very helpful. I doubt the bolt broke at the head. It's likely on the threaded below the shoulder. If so removing the top cap of the bolt will get the broken bits out and a regular crank puller like the one pictured should work to get the cranks off. The bolt is another story. DO NOT use a screw extractor as a first line defense. Heat and left hand drill bit first. Extractors break too easy if not used carefully then you are super screwed.

This is what the bolt looks like unbroken. It's 2 pieces. If it's broken you should be able to get some pieces out and show us what you are working with.

Nice Brian - thank you. I'll update as this progresses.