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  1. #1
    mtbr member
    Join Date
    Mar 2013

    Sharing a first time experience with aluminum oxide

    Just wanted to share....

    I have an old bike that I haven't ridden in many years (my son is getting his first MTB and I want to ride with him).

    So I brought it to the LBS for a tune up after I doused the thing with CLP and rode it home.

    But, I noticed the seat was too low.

    So I tried to raise it. But the post wouldn't budge. I figured: No big deal, I'll squirt some CLP Break Free and get a wrench and all will be fine.

    many hours later, my suspension post chewed up nicely, I was no where closer to loosening it.

    So I turned to the web and found great articles about the many ways to attack this problem. I had intuitively done many of them already, but there was plenty of info I did not know.

    Most importantly, that the posts are typically aluminum and when aluminum oxidizes inside an iron tube, it creates a super tight bond.

    So I got a jug of ammonia and a quirt bottle, turned the bike upside down and took out the 2 screws that would hold a water bottle holder and filled the tube with ammonia.

    Did that many times over the course of hours and sure enough, got the thing out.

    I ruined it in the process (it had play in a twisting direction from the torque of the wrenching), but I quickly replaced it at the LBS.

    I feel all happy about this now.

    BTW, I know just about zero about fixing bikes.

    Thanks for letting me share (maybe this post will help the next guy who is in this situation).


  2. #2
    mtbr member
    Join Date
    Aug 2007
    just broke free a aluminum post and steel frame the other day. soaked the frame upside down for 24 hrs with kroil. frame clamped upside down and 2 guys. one with a pipe wrench and another with a chain wrench on the saddle clamp head. 1 2 3 heave ho and go. tink the post broke free. took a mallet and banged the rest of the post out

  3. #3
    mtbr member
    Join Date
    Mar 2013

    I resisted putting all my force to rotate is because it was a suspension post and I had a feeling it would break the post because breaking free of the frame.

    I've got to check out kroil. Is it good for aluminum oxide?

    The ammonia really worked.

  4. #4
    mtbr member
    Join Date
    Apr 2012
    Kroil is hands down one of the best penetrating fluids there is. It will actively eat corrosion. I have never encountered something that I couldn't free from corrosion with it. Aluminum, however can be freed with out much sweat by using ammonia, so you did the right thing. Cheaper than a can of Kroil, anyhow (but you should still buy one).

  5. #5
    mtbr member
    Join Date
    Mar 2013
    Did a quick Google and I see that Kroil complements Breakfree, so I went ahead and ordered a gallon of the stuff.

    Now I need more projects....

    Thanks for the tip.

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