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Removing a 3pc crank from a bmx

jozi · 2008-07-07 21:21:47

How do you remove a 3pc crank from a frame without destroying it? I have 2 frames to build a bike with (or 2 bikes) 1 has a 3pc crank in it the other i have a 1pc crank for courtesy of shagman (if you read this, yes I still haven't fitted the crank :o )

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07-07-2008 10:21pm

#1

jozi

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How do you remove a 3pc crank from a frame without destroying it?

I have 2 frames to build a bike with (or 2 bikes) 1 has a 3pc crank in it the other i have a 1pc crank for courtesy of shagman (if you read this, yes I still haven't fitted the crank )

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#2 12-07-2008 2:41pm
studiorat

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Prolly need a crank extractor tool. Without seeing it, it's hard to say.

Bring it to local shop, they could do it in minutes...

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#3 12-07-2008 8:00pm
jozi

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There is no local shop near me that would have the tool

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#4 12-07-2008 9:26pm
pete4130

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Depends on the crank in question. Tools arent really necessary for bmx cranks. Mine slide on and off by hand. Some might need a bit of persuusian with a mallet or something.
What cranks are they? Are they sealed or unsealed? It's got to be an American bottom bracket if its an older Haro your taking off/putting them onto?

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#5 12-07-2008 9:29pm
jozi

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It's an older Haro, US Bottom Bracket, it's a cartridge bottom bracket prob not sealed, see thread here http://www.boards.ie/vbulletin/showthread.php?t=2055330433 i'll google some pics of a similar crank.

I've not been home since i took the 2 bikes apart so haven't really tried to get it out as such, they didnt slide anyway.

EDIT: similar to these catridge bearings:

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#6 13-07-2008 6:28am
pete4130

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Yeah, should be a a bolt or two depending on the crank arm design, you'll need to loosen these and tap a crank arm off, then tap the spindle thru the bottom bracket and use something to put inside the bottom bracket and beat the bearings out (make sure you work around the bearing to tap it out evenly, you don't want to damage the bearing). How I hated working on american BB's!

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#7 13-07-2008 10:31am
jozi

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The arms are long of, only thing left on the frame are bearing cups and the BB.

That the spindle just taps out is new to me! I remember putting a in a dmr 3pc crank in my own bike and it had shims/rings put over the spindle so it didn't move, maybe i done some thing wrong back then :rolleyes:

I'l be home sometime this week i'll give it a go

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