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Old 05-02-12, 08:27 AM   #1
buldogge
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OA Question #2...

Since OA doesn't like aluminum, can I count on the side benefit of it aiding in the removal of an uber-stuck Shimano BB??? Otherwise I'm gonna need to drill this BB out and carefully cut thru the cups...
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Old 05-02-12, 10:57 AM   #2
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In researching stuck seat posts (aluninum/steel) interactions what came up was:

* Ammonia (heavy duty 10% solution from Ace not from grocery store), soak with a lot of patience (I am onto second week of soak we will see)
* 50/50 acetone and ATF (auto tranmission fluid) this is also touted by a friend who fixes a lot of beat up bikes.
* cut the darn thing out
* brute force
* and one case of using lye to eat the aluminum.

did not see any references to getting any benefit from OA.

don't know if they will apply as well to bottom bracket......

good luck
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Old 05-02-12, 11:04 AM   #3
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This is the best stuff I've found. Used it on a stuck stem. Sprayed once a day for a week and then it came right out:

http://www.blastercorporation.com/PB_Blaster.html
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Old 05-02-12, 12:05 PM   #4
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Lye eats paint, and is pretty hazardous, so be careful if you go that way. Strong ammonia should only be used outside.

PB Blaster is OK, but there are several better choices: Kroil and acetone/ATF are two that come to mind.

My experience with dilute OA is that it is corrosive to aluminum, but is not going to dissolve it.

+1 Lye + eyes = blindness.

Last edited by wrk101; 05-02-12 at 02:12 PM.
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Old 05-02-12, 12:46 PM   #5
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Quote:
Originally Posted by wrk101 View Post
Lye eats paint, and is pretty hazardous, so be careful if you go that way.
And flesh, so wear heavy-duty gloves, long sleeves and pants, and eye/face protection. And be aware that dissolving NaOH in water will release heat, so slowly add NaOH to water to get the concentration you need to avoid boiling and splatter.
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Old 05-02-12, 01:44 PM   #6
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Thanx guys... Not worried about the paint, as it is getting repainted.

After it comes out of its OA bath (in there now) we will see how it goes, then I'll attack with other products. If all else fails, I will drill around to remove the spindle and carefully cut the cups out.

TA
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