Advertise on Bikeforums.net



User Tag List

Results 1 to 11 of 11
  1. #1
    Member
    Join Date
    May 2009
    Location
    Winnipeg
    Posts
    46
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    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?

  2. #2
    Senior Member DannoXYZ's Avatar
    Join Date
    Jul 2005
    Location
    Saratoga, CA
    Posts
    11,495
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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.
    Last edited by DannoXYZ; 05-29-09 at 05:12 PM.

  3. #3
    Member
    Join Date
    May 2009
    Location
    Winnipeg
    Posts
    46
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks! I'll check it out.

  4. #4
    Senior Member
    Join Date
    Dec 2008
    Posts
    709
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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.

  5. #5
    Senior Member
    Join Date
    Jul 2005
    Location
    Portland, OR
    My Bikes
    Surly Pacer with full Ultegra
    Posts
    1,016
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    PB Blaster is a miracle worker. Also good: heat/cold, FORCE.
    Surly Pacer

  6. #6
    Member
    Join Date
    May 2009
    Location
    Winnipeg
    Posts
    46
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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

  7. #7
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    12,450
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    Be sure to use an anti-seize compound when you reassemble the parts, so you don't have to go through this process again.

  8. #8
    My bike's better than me! neil0502's Avatar
    Join Date
    Feb 2005
    Location
    Northern Colorado
    My Bikes
    (2) Moots Vamoots, (1) Cannondale T2000 tourer, (1) Diamondback Response Comp mtb
    Posts
    2,041
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

  9. #9
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,292
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  10. #10
    Member
    Join Date
    May 2009
    Location
    Winnipeg
    Posts
    46
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks again,
    Im posting all this handy info on our internal shop forum.

  11. #11
    Senior Member
    Join Date
    Jan 2006
    Location
    Tucson, AZ
    Posts
    759
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by JohnDThompson View Post
    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.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •