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installing a cup on one piece bottom bracket

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installing a cup on one piece bottom bracket

Old 08-13-08, 02:25 PM
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indijax
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installing a cup on one piece bottom bracket

hi!

I'm repairing an older bike with the one piece bottom bracket, problem is the cup for the drive side has corroded and fallen away. I have a repacement, including a frame with cups I could use, however I don't know how to remove the cup from one frame and install the cup on the other?

thoughts?
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Old 08-13-08, 02:48 PM
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G piny parnas
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bb

your cat in the window is also pondering this age old question------ my cat says to take it to a "pro" with pro tools (extractors etc.....) they will do it-tap it face it and it will be......................
my cat also told me to ask for a raise and don't test the stock market right now
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Old 08-13-08, 04:32 PM
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Without being snarky, I've successfully used a large pin-punch to pop out the cup from the other side. I have a poor-man's cup press for headsets and ashtabula bottom brackets that consists of a piece of threaded rod, a couple of nuts and some big fence washers that works pretty darn well for installing cups. I doubt that you'll need facing tools, since the BB shell was faced as much as it needs when the original cups were installed. After all, we're talking about a 1-piece crank, and those were made to be worked on in back yards- they're not that sensitive or precise.
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Old 08-13-08, 05:32 PM
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I removed and installed them often when I was a kid using whatever tools I could sneak out of my dad's toolbox. Never had a problem with any of them.
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Old 08-13-08, 10:13 PM
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Jeff Wills
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Originally Posted by indijax View Post

thoughts?
I think my wife wants your cat.

On the other hand, since we have enough cats, I think I'll point you at this web page:
http://parktool.com/repair/readhowto.asp?id=92
Scroll down to "cup replacement". Like the Squeazel said, it's not a particularly precise operation. I could probably do it with a hammer.
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Old 08-14-08, 09:14 AM
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Replacement Ashtabula BB sets are so cheap, you are ill advised to use used parts.

I have always just knocked out the cups with a narrow piece of hardwood, through the bracket from the opposite side and a hammer, tapping evenly around until they fall out. I install them with a wooden mallet or a hammer and hardwood block.

Current cat count: 8... Help me.
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Old 08-18-08, 06:07 PM
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woody

I totally agree--- the wood trick is the best--- using wood is one of the best fabrication options for stuck parts on various metals........
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