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Press fit bearings in bb90 blown; how can I remove the outer rim?

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Press fit bearings in bb90 blown; how can I remove the outer rim?

Old 10-18-16, 05:23 PM
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pmartbrown
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Press fit bearings in bb90 blown; how can I remove the outer rim?

I have no idea how I rode with this problem, but it's a lesson on taking time to clean during rainy fall days.

So much grit got into my bb that it seized the non-drive side bearings, and they ripped apart on my last ride (partial ride). The outside of the press for bearings is "press fit" in the bb and I can't get it out to put new bearing kits in.

Any ideas?

No need to remind me how stupid it was to ride this way. That feedback has already been received.
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Old 10-18-16, 05:46 PM
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Park Tool makes bearing remover tools/fittings for pretty much all types of press fit bb bearings. You carefully place the tool/fitting against the bearing, inside the shell from the other side, and hit it with a hammer, much like you would in removing a pressed-in headset cup, and the bb bearing will come out. Once that's done, the new bearings are installed with a bearing press.
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Old 10-18-16, 05:53 PM
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Can you get behind the bearing race? If so, could you drive it out with a hardwood dowel from the other side?
Or if there is a recess behind the bearing, take a washer that is larger than the bearing, grind flats on it so you can pass it through and then tilt it so that it contacts the bearing. Then drive against that.
LBS might have a blind bearing puller. Some of the auto parts stores rent or loan tools, see if they have a blind bearing puller.
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Old 10-24-16, 04:37 AM
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pmartbrown
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Thank you for your responses. Unfortunately, there want a recess behind the bearing to get anything in. I was hoping to try the washer idea.

I caved and took it to a bike shop. They through up their hands and said they couldn't do anything. Then I took it to a Trek shop and they charged me $50 to send it to the Trek Japan center and have it removed. I need to wait two long weeks, but at least there is light at the end of the tunnel.

Thanks
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Old 10-24-16, 07:35 AM
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Originally Posted by pmartbrown View Post
I have no idea how I rode with this problem, but it's a lesson on taking time to clean during rainy fall days.
So much grit got into my bb that it seized the non-drive side bearings, and they ripped apart on my last ride (partial ride). The outside of the press for bearings is "press fit" in the bb and I can't get it out to put new bearing kits in.
Any ideas?
I realize it's too late to save this instance, but the way to do this is really pretty easy.

If you still had all the pieces from the bearing, you should have just re-assembled it back into the outer race that is stuck in the frame, and then removing the whole bearing would have been easy, by normal means.

Assuming that the bearings fell apart while riding, then the spider was destroyed and some of the balls may have fallen out and gotten lost.... So then what you should have done was, gone and bought a bearing of the same size, and disassemble it, and re-assemble the balls, center race and spider into the outer race that was stuck in your frame. Then the whole bearing could have been removed normally.
,,,,,,
Or you could have just told the local bike shop to do it that way.

This would have cost you the price of a new bearing just to extract the stuck race, but it would have been faster and cheaper than sending it out somewhere else.

...I would not advise you to re-assemble the new bearing parts and try to use it, since the balls may have spalled during extraction of the stuck race... and failed bearings was how you got here
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Old 10-24-16, 09:16 AM
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Easy-peasy. Go in and pick out the inner grease seal. That leaves a space to get in behind the bearing race (that part you are calling the outer rim). Take a drift and hammer to drive it out from the other side. Or use a slide hammer with a hook on it and yank it out from this side. I use a 1/4" carriage bolt as a hook in my slide hammer. The underside of the bolt head is the hook.


Or go to Harbor Freight and buy the $25 Slide Hammer and Puller Set 14 Pc., item #62959.
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Old 10-24-16, 03:03 PM
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i think Doug nailed it. Deep groove radial bearings are assembled by offsetting the internal and external races, then putting in as many bearings will fit in the crescent-shaped space between them, then spacing the balls to center the internal race in the external one, then putting in a spacer to ensure that the balls remain spaced. If your external race is worn, you could use slightly oversize bearings to fit snugly. Then a wap on the internal race should knock the external one out.

One warning on this removal. There are some folks on this site and others that have recommended bearing retaining compound (e.g. Loctite 609, or others) for loose/squeaky BB bearings. This adds up to 3000 psi shear strength, or about 4000lb thrust for a BB30. The normal way to remove this is with heat, but for a CF frame this is problematic. In this case, I could see where one might be compelled to shield the thing, and TIG weld small (to minimize the heat that the frame sees) tabs to the ID of the bearing. This would break the adhesive bond, and give you a lip to hit with a drift to knock the bearing out.
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Old 10-24-16, 03:48 PM
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I wish I would have held onto my bike a couple days longer to get these responses. I had no idea it was possible to rebuild the bb with only the bearing race and gave it strong enough to push out. Thank you!
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