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Cottered cranks?? How to remove?(5 posts)

Cottered cranks?? How to remove?huez
Jul 26, 2002 8:34 AM
Im trying to take the cranks off this old raleigh frame. I took off the nut on the cotter but I cant pound out the pin. Am I doing something wrong or is this thing just frozen in there? Thanks.
re: Cottered cranks?? How to remove?wooglin
Jul 26, 2002 8:45 AM
Probably frozen. Get a piece of 2x4 that will reach from the ground to the crank. Cut a small notch in it deep enough for the head of the cotter pin plus a little more. Support the crank with the 2x4, then have at it with a hammer.

This is, of course, assuming you don't have a proper pin remover. And it may trash your bb.
Hammer Bad...OMS
Aug 20, 2002 4:38 PM
This suggestion of placing the 2x4 under the crank arm (for support) is right on target. Without this type of support under the arm, when you pound with that hammer, you are pounding directly on the ball bearings, driving them directly into the bottom bracket cups. Be also aware that cotter pins come in different sizes, so be sure to take the original to your shop for matching. The most popular sizes are 9.0 and 9.5mm. Clean off all metal surfaces (including the hole in the crank arm (for the cotter pin) and install by reversing the 2x4 technique used for removal. The nut on the cotter pin is to lock it in position, not pull it there. Hammer with the same force as a small finishing nail, you don't have to kill it. After 50 miles or so, revisit the pin for a second tightening. Remember though, no hammer pounding the ball bearings.
I spent a month trying to do that once...retro
Jul 26, 2002 9:02 AM
Wooglin's suggestion should work--it's better than mine, which was just to bash the crap out of the pin (which will eventually mushroom so it won't fit through the hole, and then you can drill it out, messing up the spindle, which you won't be able to replace...). Supporting the BB with a board is a good idea.
FWIW, though, those things can REALLY get stuck. I never found that penetrating oil helped much, but it can't hurt, so you might as well use it first. And (this happened to--ahem--a friend one time with his very first real bike when he was 15) be sure you're whacking the THREADED end of the cotter, not the big end. Good luck.
Last time I did it? Dremel tool!Walter
Jul 27, 2002 7:00 PM
Worked fine even if I went through a few cut off wheels. They're cheap.

I hate cottered cranks. If it's from the 1950s or earlier that's one thing. Otherwise, unless you're going to hang it from a wall destroy the d@mned thing.