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Need advice on bottom bracket repair
On Sun, 8 Jan 2017 17:27:33 -0500, Frank Krygowski
wrote: I too have had much better luck with PB Blaster or old-style Liquid Wrench than with WD-40. Same here. WD-40 may have 2,000 uses but it's only good at what it was originally designed to do; displace water. https://wd40.com/img/WD-40_2000_uses.pdf I hate suggesting ideas that I haven't tried, but if you're willing to take the risk (and not sue me), this might actually work. Better living through chemistry. In this case, we have a steel cup and an aluminum frame and bottom bracket. My guess(tm) is the threads are clogged with iron oxide (rust) and aluminum oxide (white crud). The trick is to find a chemical that will attack both without trashing the base metals. One thing *NOT* to use is CLR or various household calcium/lime/rust removers. The acid will attack the two oxides, but will also destroy the base aluminum threads. It may come apart, but you probably won't have any threads left in the aluminum. So, what to do. Oxalic acid and water mix will attack both the rust and the white crud. It's a rather large molecule, so it may take some soaking of the bottom bracket in the oxalic acid solution to get some penetration. If you feel ambitious, heat up the bottom bracket slightly, slop on the oxalic acid, and get out of the way. Tiny air spaces in the threads will produce a partial vacuum as it cools, and suck in the liquid. It won't suck much but it might be enough to soften whatever is jamming the threads, especially if you can move the steel cup with the now broken bottom bracket wrench. Oxalic acid will bleach anything it touches, especially your clothes, so please wear gloves and protective clothing. When you put it back together, I suggest a little Never Seize: http://www.neverseezproducts.com/neverseez.htm http://www.neverseezproducts.com/antiseize.htm to prevent a repetition of this exercise. However, if you do use some kind of anti-seize or grease, be careful not to over tighten the cups. Good luck. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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