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PostPosted: Tue May 31, 2011 7:54 pm 
Dirt Disciple
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Joined: Sun May 15, 2011 10:13 pm
Posts: 25
As title, I've removed the pinch nut but what's next????

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PostPosted: Tue May 31, 2011 8:52 pm 
Retro Guru
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Joined: Thu May 29, 2008 11:11 pm
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Location: Letchworth Garden City
Cottered cranks just slide off the axle once you removed the cotter pin (the thing the nut is attached to)
My old williams had a screw on spiral bottom bracket fitment, very funky.


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PostPosted: Tue May 31, 2011 9:01 pm 
retrobike rider
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Joined: Sat May 29, 2010 3:44 pm
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Location: Leeds
Leave the nut on fully threaded, ie a nut full of thread, more than you have in the picture and then strike it hard and very square. The pin "should" then fall out.


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PostPosted: Tue May 31, 2011 9:30 pm 
Devout Dirtbag

Joined: Sun Sep 05, 2010 2:46 pm
Posts: 132
Location: Bath, UK
If it doesn't come out, PlusGas is your friend. Failing that, heat works but risky with chrome and paintwork, and I've also drilled one out, but it took a long time. Fingers crossed your cotter pin is happy to come out!


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PostPosted: Tue May 31, 2011 10:47 pm 
Retro Guru
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Joined: Fri Sep 17, 2010 5:34 pm
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Location: Olissipo-PT
You need a Hammer!


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PostPosted: Wed Jun 01, 2011 12:47 pm 
Retro Guru
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Yep, knock that pin out and it should come free. The cranks often need a bit of persuasion once the cotter pin is out because the cotter pin can slightly deform the axle. It can make it a bit tight.


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PostPosted: Wed Jun 01, 2011 1:04 pm 
Retro Guru

Joined: Fri Sep 25, 2009 3:22 pm
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Hammering is much more effective if you support the crank underneath using a bit of pipe (like an old seatpost) - one end of the pipe over the protruding cotter pin and the other end onto a hard surface. It's easier if you get someone to hold the bike for you.

If you don't support the crank, the energy from the hammer is getting absorbed by the frame/wheels. Also, hammering without support can mash up the bottom bracket bearings!

Don't tap it either. Whack it as hard as you can. If you tap it, you'll bend the cotter pin rather than popping it out.


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PostPosted: Wed Jun 01, 2011 6:56 pm 
Dirt Disciple
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Joined: Sun May 15, 2011 10:13 pm
Posts: 25
Thanks for all of the advise, soaked it in some GT85 and have made some progress with a hammer:

Image

Can't seem to get it out any further, so am leaving it to soak some more...


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PostPosted: Thu Jun 02, 2011 3:37 am 
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Location: Letchworth Garden City
It should come out once you tap it with something to knock it through, could use a punch if you have one or even a thickish bolt with wide head,(not too long though)


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