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Stubborn bottom bracket

Old 03-09-12, 05:07 AM
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MightyLegnano
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Stubborn bottom bracket

I have this bike with a Sealed cartridge bottom bracket and it's almost impossible to get it out. The truth is I'm not absolutely sure if it's regular threaded so I didn't pull with all my strength. Plus I don't have the bolt that locks the cap removing tool in place, so it's a bit loose.

Do you have any suggestions? Maybe leave some WD40 and try the next day? Do you think it will work?



EDIT: By the way, this bike has some grooves underneath the bottom bracket shell for the wires. That means that the front derailleur "opens" when the wire pulls downward (because the wire comes under the bracket shell and up to it). I knew until now that derailleur "opens" when you pull it from above if that makes any sense. Is that because it is an old type? Do you know the name to diferentiate those two types?

Sorry for my poor discription. If you didn't understand I can upload a photograph.

Last edited by MightyLegnano; 03-09-12 at 05:18 AM.
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Old 03-09-12, 05:27 AM
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For the BB, leverage, make sure your pulling the correct way for the side that's stuck, try a breaker bar on it if you have one, it should go eventually, if this doesn't work, think about taking it to a bike shop.

For the FD, there are 2 main types, top and bottom pull/swing, from you description, you have a bottom pull. If you look at the Shimano Tech Docs https://techdocs.shimano.com/techdocs/index.jsp at the FD's the instructions show how to set these up.
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Old 03-09-12, 05:57 AM
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remove the non drive side first then you can measure the threading to measure the threading.
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Old 03-09-12, 08:33 AM
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It would help to know what kind of bike you have and if the bottom bracket (BB) has any threading markings on it

63x24 would be Italian and regular right hand thread (righty tighty / lefty loosey)

1.37x24 is English, the nondrive cup is right hand thread but the drive side (AKA 'Fixed Cup') is left hand thread so you need to turn to the left to loosen.

If there is anything different marked on it post the numbers here and somehow will know the threading.
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Old 03-09-12, 08:41 AM
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Originally Posted by Bianchigirll View Post
It would help to know what kind of bike you have and if the bottom bracket (BB) has any threading markings on it

36x24 would be Italian and regular right hand thread (righty tighty / lefty loosey)

1.37x24 is English, the nondrive cup is right hand thread but the drive side (AKA 'Fixed Cup') is left hand thread so you need to turn to the left to loosen.

If there is anything different marked on it post the numbers here and somehow will know the threading.
Fixed the transposed numbers
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Old 03-09-12, 11:29 AM
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Pictures would be helpful.

Use some REAL penetrating oil.
WD-40 isn't!
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Old 03-09-12, 11:51 AM
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Originally Posted by Bianchigirll View Post
It would help to know what kind of bike you have and if the bottom bracket (BB) has any threading markings on it

36x24 would be Italian and regular right hand thread (righty tighty / lefty loosey)

1.37x24 is English, the nondrive cup is right hand thread but the drive side (AKA 'Fixed Cup') is left hand thread so you need to turn clockwise to loosen.

If there is anything different marked on it post the numbers here and somehow will know the threading.
Just to clarify
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Old 03-09-12, 01:56 PM
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I replaced mine a few days ago. Left side came right out, but had a heck of a time getting the right (drive) side out. What eventually worked is:

-Zip tied the BB removal tool to the BB and shell, so it wouldn't yank off under pressure.
-Sprayed some penetrating oil (liquid wrench) onto the joint, so it would hopefully get into the threads. (Not sure if this helped or not)
-Still couldn't get enough leverage to break it loose, so hit the tool handle with a rubber mallet. This broke it loose.

If it still hadn't come loose, the next step would have been to attach a steel seatpost or other lever-like item to the removal tool with zip ties to get more leverage. I had to do that on the right crankarm when I was trying to get that off.
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