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How to remove stuck cartridge BB?

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How to remove stuck cartridge BB?

Old 11-12-12, 10:03 PM
  #1  
chucko58
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How to remove stuck cartridge BB?

A few years back I bought a Surly Long Haul Trucker for a commute bike. It's been great. But the Shimano UN54 bottom bracket has developed a click - and I noticed tonight while doing routine maintenance that the plastic non-drive-side cup is cracked. So I suspect the cup is the source of the click.

The problem? I have no trouble getting out the NDS cup, but the BB itself (i.e. the drive side) is well and truly stuck in the frame. I suspect, or at least hope, that it's due to a threadlocker. But nothing I've tried will make the BB budge, up to and including an electric impact wrench.

How do I get this thing out, short of taking a torch to the frame?
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Old 11-12-12, 10:15 PM
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bolt the bb tool down. slip on a deep socket over the tool. insert favorite ratchet or breaker bar. add cheater bar and heave ho. i like to brace the frame with my feet or if the wheels are still on i step on the ratchet
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Old 11-12-12, 10:20 PM
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You are turning it the correct direction, right? ISO or English BBs have a left-hand thread on the drive side.
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Old 11-12-12, 10:21 PM
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Also remember that the drive side is reverse thread, so hopefully all that force is going clockwise, otherwise you have an even bigger battle on your hands
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Old 11-12-12, 10:25 PM
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Ah, thanks for the reminder about the left hand thread... though I'm pretty sure I tried both directions. I'll try again soon. The Shimano BBs are great, but since you can't get the metal NDS cup UN7x series any more, I'm going to get an SKB [edit: SKF] to replace it.

Last edited by chucko58; 11-12-12 at 10:48 PM. Reason: braino
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Old 11-12-12, 10:45 PM
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You could just replace the plastic cup:

http://problemsolversbike.com/products/up_cups/
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Old 11-12-12, 10:49 PM
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I didn't know about the Problem Solvers cups. That's a great idea.
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Old 11-13-12, 07:30 AM
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Forget the breaker bar. Just use a strong, securely mounted vise and you have a much longer lever called the frame.
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Old 11-14-12, 12:02 AM
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BikeParts.com had the Shimano UN54 alloy NDS cup for less than I could find the Problem Solvers cup, so I ordered one. I hope to see it this weekend. I also hope it fits my UN53​ BB when it gets here...

Last edited by chucko58; 11-14-12 at 12:03 AM. Reason: more verbiage
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Old 11-18-12, 01:31 PM
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The UN54 alloy cup fit my UN53 BB just fine, and has done away with the click. The BB itself is still nice and smooth, so I guess I can put off an upgrade for a while. Thanks to all for the help!
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Old 11-18-12, 02:41 PM
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If the cartridge is still OK bearings and all < note QBP has an Aluminum "up Cup" as a separate part,

But I expect you will find a bin of worn UN XX BBs in your LBS where the plastic Left side
is used , but not cracked.

You could just wait till the whole thing needs replacement.

that is what I did. ignored the cracked plastic one until then,

90% 0f it is just getting it in tight from the left,
the plastic wont Corrode like the un-greased aluminum will.
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