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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 05-29-09, 02:30 PM   #1
0speedbike
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aluminum+steel = spontanious weld

'lo folks.
A kid picked out a nice frame (some sorta light Richie MTN bike) from our build-me-up room but the aluminum cartridge bits have fused in the bb. Is there anyway of getting this out w/o screwing up the frame or should I just toss it in the recycling pile? I've also encountered this with aluminum seat posts in steel frames and have never been able to get them out. Any suggestions?
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Old 05-29-09, 03:20 PM   #2
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PB Blaster is your friend. Spray it on, let it sit for a day or two. And the parts come off easily. I've had stubborn seatposts that refused to budge with other penetrating-oils and/or heat and breaker-bars just slide themselves into the seat-tube overnight after I've sprayed PB-blaster on.

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Old 05-29-09, 03:33 PM   #3
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Thanks! I'll check it out.
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Old 05-29-09, 03:41 PM   #4
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Aluminum oxide (the junk holding the two pieces together) will dissolve in basic solution. The more concentrated, the faster things will work (which may or may not be a good thing, depending on what is around) but anything from washing soda, to ammonia, to lye should work. Might take a good soak, though, to get everything loose.
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Old 05-29-09, 04:01 PM   #5
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PB Blaster is a miracle worker. Also good: heat/cold, FORCE.
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Old 05-29-09, 04:22 PM   #6
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I had heard whispered rumors about soaking in ammonia but there were skeptics. I think it's worth a try though, and I'll pick up some o' that PB blaster for the shop as well (it is a free bike shop) . Thanks again
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Old 05-30-09, 08:20 AM   #7
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Be sure to use an anti-seize compound when you reassemble the parts, so you don't have to go through this process again.
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Old 05-30-09, 08:23 AM   #8
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General info on torque, lubrication, and fasteners:

http://www.parktool.com/repair/readhowto.asp?id=88

AND

http://www.parktool.com/repair/readhowto.asp?id=89

AND

http://www.sacskyranch.com/antiseize.htm

AND

http://www.raskcycle.com/techtip/webdoc14.html
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Old 05-30-09, 08:25 AM   #9
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Quote:
Originally Posted by 0speedbike View Post
'lo folks.
A kid picked out a nice frame (some sorta light Richie MTN bike) from our build-me-up room but the aluminum cartridge bits have fused in the bb. Is there anyway of getting this out w/o screwing up the frame or should I just toss it in the recycling pile? I've also encountered this with aluminum seat posts in steel frames and have never been able to get them out. Any suggestions?
If you want a fast way that may damage the paint, then torch it. If you want a really slow way, dremel or hack saw. I would exhaust as reasonable maximum force on the bb with a proper tool and lever and tool to secure said proper tool on before resorting to my first two suggestions.
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Old 05-30-09, 02:53 PM   #10
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Thanks again,
Im posting all this handy info on our internal shop forum.
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Old 05-30-09, 11:02 PM   #11
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Be sure to use an anti-seize compound when you reassemble the parts, so you don't have to go through this process again.
Tis why they invented marine-duty grease! Thick, stays put, waterproof, and stops corrosion.
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