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Old 10-22-05, 11:11 AM   #1
gooeysoft
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How do you remove (3 piece) crank bearings?

How do you remove (3 piece) crank bearings?
I'm having trouble removing the crank housing/bearing from a new frame i've bought.
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Old 10-22-05, 11:53 AM   #2
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Depends entirely on the crankset. Typically you take a flat punch (or a big screwdriver) and very carefully tap them out with a hammer. NEVER tap on the seals, only on the races, and tap evenly around the circumference of the bearing unit. Basically if you hit the seals, the bearings are f*cked.
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Old 10-22-05, 06:11 PM   #3
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I accidently punched a sizable hole in my friends bearing seal. I told him it was nothing to worry about and he doesent know anything so he believed me.
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Old 10-22-05, 06:16 PM   #4
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If you punch a hole in the seal, just fill it with sand and duct tape over it.
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Old 10-22-05, 06:28 PM   #5
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Quote:
Originally Posted by sxe fbm rider
I accidently punched a sizable hole in my friends bearing seal. I told him it was nothing to worry about and he doesent know anything so he believed me.
i did that to my best freinds bike i told him you where supposed to that he believed me
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Old 10-22-05, 06:47 PM   #6
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You guys are mean. How much would it cost to replace it if you ruin it. And how can you be their friend if you lie to them?

I guess around $29. The going price for friendship.
http://www.bikepro.com/bmx/bmxbb.html

Last edited by Darin; 10-22-05 at 07:02 PM.
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Old 10-22-05, 06:57 PM   #7
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I accidently punched a sizable hole in my friends bearing seal. I told him it was nothing to worry about and he doesent know anything so he believed me.
So...I don't get where you're going with this. Am I supposed to try and figure out who the bigger idiot is?

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Originally Posted by racersk66
i did that to my best freinds bike i told him you where supposed to that he believed me
Well, that solves that. Here's the biggest idiot, for basically repeating what the guy before JUST SAID. You = 0% at life.
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Old 10-22-05, 08:33 PM   #8
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If you punch a hole in the seal, just fill it with sand and duct tape over it.
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Old 10-23-05, 01:40 PM   #9
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Quote:
Originally Posted by Expatriate
I happen to know, duct and BMX bikes are a perfect match.....
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Old 10-23-05, 03:39 PM   #10
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i took the spindle and made it go crooked and hit the spindle to knock the bearing out and my bike works fine no problems u could give that a try
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Old 10-23-05, 04:27 PM   #11
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depends on what kind of bb you have.
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Old 10-23-05, 05:42 PM   #12
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This applies to non euro bbs; Remove the cranks, remove the axle, put a socket extension half way through the bb and push/knock it down. That should move the spacer out of the way so that you can see the inner race of the bearings. Wail away with the socket extension on the bearing race till it comes out.
If you damage the seal remove it, you don't really need a seal on the inside of a bb anyway.
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Old 10-23-05, 06:01 PM   #13
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Quote:
Originally Posted by Darin
I happen to know, duct and BMX bikes are a perfect match.....

tube patches
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Old 10-23-05, 10:34 PM   #14
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I tried patching my tube with duct tape once, didn't work out so well....
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