can't get the left crank off.The self extracting bolt came apart It's a Dura ace 7700

ciarano · 22-08-2022 3:40pm #1

Can anyone help?Im restoring an old C40

I can't get the left crank off.

Can it be tapped off? Any other ideas ?

The self extracting bolt came apart and now won't work,It's a Dura ace 7700 crankset it's cream crackered.I just need to get crank arm off

Thanks Boardies

07Lapierre · 22-08-2022 4:27pm

Do you have one of these? https://www.chainreactioncycles.com/ie/en/lifeline-crank-extractor/rp-prod10181?gs=1&sku=sku793809&utm_source=google&utm_term=&utm_campaign=&utm_medium=base&gclid=EAIaIQobChMImZ-Oq-Ha-QIVirTtCh0LVQKLEAQYASABEgI7oPD_BwE&gclsrc=aw.ds

ciarano · 22-08-2022 6:23pm

Thanks for the reply yes I do well I have a crank extractor but apparently not required for this crank.

The chainset right side came off no issue when I loosen with the Allen key.

Looks like it's seized and I will have to tap off

Eamonnator · 22-08-2022 8:02pm

I think what 07Lapierre means is that you can use the crank extractor to take off the crank, even though it originally didn't need one.

ciarano · 22-08-2022 8:17pm

Thanks for the message. I tried and no luck :(

25sean · 22-08-2022 10:28pm

Hammer Time!!

07Lapierre · 22-08-2022 10:59pm

if the extractor doesn’t work, you could try pulling it off with a pullers? Something like this might do it…

https://www.bike24.com/p2159125.html

07Lapierre · 22-08-2022 11:49pm

This guy has a few ideas:

https://youtu.be/QpN9UtcE1yQ

ciarano · 23-08-2022 5:41am

Thanks everyone for the tips and advice and the video

cletus · 23-08-2022 6:33am

https://www.boards.ie/discussion/comment/119507165#Comment_119507165

I asked this on the other thread, but it might be better here. When you say it didn't work, did the crank puller not fit, or is the crank seized on?

ciarano · 23-08-2022 6:35am

Left crank seized there is a tiny bit of play so going to work on it today and see if I can get a pulley

Thanks

nicksnikita · 23-08-2022 7:21am

Hacksaw between left side crankarm and BB should do the job (if entire crank is already finished).

Had to resort to this tactic once ever when stripping a bike that was left exposed to the elements for months

ciarano · 23-08-2022 7:25am

Thanks nIicknikita

Unfortunately i dont have a hacksaw OR heat gone as also suggested ,Im on to the Park tools site now to to see what else i can do ,looks like its going to be brute force :)

nicksnikita · 23-08-2022 4:43pm

https://www.boards.ie/discussion/comment/119508920#Comment_119508920

Well you don't need to worry about protecting the crank so just be careful you don't contact the frame with the sledge hammer :-)

Weepsie · 23-08-2022 5:35pm

If you're near a half decent motor factors you can try something like Hayes crack it freeze spray. There's a few different versions. Its both an excellent penetrant oil and it forces the metal to rapidly contract and expand back.

Otherwise a cheap hacksaw from screwfix will do it.

ciarano · 23-08-2022 5:41pm

Thank Weepsie ,

I sent it to my neighbour who's a motor mechanic and he has better tools to try and sort it ,fingers crossed

Cheers for all the tips and advise guys

ciarano · 01-09-2022 5:56am

Thanks everyone crank off :) now only seat post and bb to go :(

cletus · 01-09-2022 7:33am

Don't keep us in suspense, did you have to use the nuclear option?

ciarano · 01-09-2022 7:41am

The neighbour a motor mechanic had a pulley and off it came crank intact but aesthetically beyond use ,

Will try saddle technique to twist out seat post and as for the BB that's another adventure ,if i can get all removed it would make a lovely build

Thanks again

cletus · 01-09-2022 1:02pm

Bench vice is your friend for the seat post. Clamp the post, and rotate the frame. You'll have much more leverage

magicbastarder · 01-09-2022 1:10pm

'aesthetically beyond use' - how bad is it?

ciarano · 01-09-2022 6:09pm

'aesthetically beyond use' - how bad is it? BAD :) :)

Large bottle small glass · 01-09-2022 7:01pm

https://www.boards.ie/discussion/comment/119555709#Comment_119555709

You need to embrace your inner rough fucker; an essential quality for some bike jobs

can't get the left crank off.The self extracting bolt came apart It's a Dura ace 7700

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