Crank arm Disassembly - WTF?
07-28-07, 02:02 PM
#1
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Crank arm Disassembly - WTF?
Hey all,
I am in the middle of overhauling a old mountain bike and I am down to the last disassemble - The 2 Crank arms from the chainring and frame. I have all the nuts I can find off the the crank arm ends but it still won't come apart. I thought maybe that the crankarm itself was screwed to the pin but I tried it without any luck. I even tried hammering. There is no sign of a screw holding it in place. I am stumped. Anyone have any insight?
I am in the middle of overhauling a old mountain bike and I am down to the last disassemble - The 2 Crank arms from the chainring and frame. I have all the nuts I can find off the the crank arm ends but it still won't come apart. I thought maybe that the crankarm itself was screwed to the pin but I tried it without any luck. I even tried hammering. There is no sign of a screw holding it in place. I am stumped. Anyone have any insight?
07-28-07, 02:07 PM
#2
Really Old Senior Member
Crank arm puller
https://sheldonbrown.com/harris/tools...ket.html#crank
https://sheldonbrown.com/harris/tools...ket.html#crank
07-28-07, 02:59 PM
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Is there an alternative to the crank arm puller? I can't justify buying this tool for a one-time use.
07-28-07, 03:04 PM
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07-28-07, 03:08 PM
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Take it to an LBS, and have THEM pull the cranks off.
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07-28-07, 08:20 PM
#10
that bike nut
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I have heard that if you take the bike for a spin around the block with the nuts off and keep it in a low gear and don't apply much pressure to the pedals that the cranks should fall off and not be damaged. However, I'd still recommend getting the crank extractor.
07-28-07, 08:43 PM
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Not the best idea as you can distort the square taper if it comes off when you are applying a lot of pressure when it pops loose. Moreover, often if they over torqued the bolt during installation the riding method won't work easily. I agree with you just buy the tool.
07-29-07, 12:47 PM
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BE SURE that the outside of the puller is FULLY seated in the crank or you'll strip out the threads. Back the inner part (plunger) all the way out before installing the puller.
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07-29-07, 05:51 PM
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This technique is normally used when the crank is to be discarded once it's off. It usually distorts the square hole in the crank arm enough that the crank never fits properly again even if you are careful.
