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Pressing BB30 bearings



 
 
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  #1  
Old August 24th 17, 05:55 PM posted to rec.bicycles.tech
JBeattie
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Default Pressing BB30 bearings

So, I use a headset press and just cinch it down with modest pressure, making sure the bearing is against the C-clip. This time, though, one cartridge feels smooth but makes noise, like I've got a bad bearing. I use the Park installation bushings, so I would assume I'm not loading the inner bearing race, and if I were crushing the out race, it would bend the C-clip. No? I may have damaged the bearing when I knocked-in the crank -- which is a super-tight SRAM BB30/PF30. It measures right, but its really tight and probably a 30.05 diameter -- or some fraction over 30mm that I haven't bothered to determine with my sloppy analog micrometer. I have to tap the crank in with a rubber mallet with lots of grease. That's where I might have gone wrong. Or maybe I just have a noisy bearing that isn't shot (again, it spins smoothly to the touch).

-- Jay Beattie.
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  #2  
Old August 24th 17, 06:25 PM posted to rec.bicycles.tech
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Default Pressing BB30 bearings

delicate ?

freeze the crank

if not wong square one then reducing a slip fit is refrigidero

HEAT
COOL

COOL
(heat)

always. not often, always overlooked

the unit you bought is prob nit self healing as shipped anyway. -6%

  #3  
Old August 24th 17, 06:27 PM posted to rec.bicycles.tech
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Default Pressing BB30 bearings

place a pipe on it n listen

place a pipe on it with earplugs in n place pipe on forehead n listen

evaluate noise with other noise makers.

  #4  
Old August 26th 17, 12:51 AM posted to rec.bicycles.tech
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Default Pressing BB30 bearings

https://www.google.com/search?gl=us&...k1.aa-zcu3oCf0
 




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