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Removing a stuck adjustable cup (Bottom Bracket)
Brian Huntley wrote: There's no way a pin-wrench is going to be able to budge the supposedly non-fixed cup (ie left side) on my all-weather commuter bike. I'm fairly sure the fixed-cup is also immobile, and this is the time of year I usually replace the bearings (it's an old cup-and-cone style bb.) What are my options? I'm thinking I could possible file some flats on it and apply the big wrench, then replace it, but I seem to recall these are really hard steel. The pin-wrench holes don't seem to be deep enough to allow me to stick a punch in one and whale on it with a mallet. Would a torch help? (It's steel-on-steel, so I'm guessing not.) Some super-duper penetrating oil? This is probably this frame's last year (I've said that before), but I would like to make it last until June at least. Well, the last time I had this problem, I used a plumber's 1/2" pipe nipple extractor, on the right hand thread fixed cup of an Italian-threaded frame. That, after other wrenches, etc., mentioned above (C Record Aluminum cup that had been serviced several times). Worked great, using a large adjustable open-end wrench to turn the extractor. The cup was already history, so no loss. The extractor says "#7,USA LM Drill, 17/32, Warning Wear Safety Goggles g 01. But maybe your BB is worth more than the frame? --D-y |
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#12
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Removing a stuck adjustable cup (Bottom Bracket)
On Sat, 07 Jan 2006 17:39:58 GMT, I wrote:
Of course all this assumes you have a cup-and-cone BB. If you're dealing with a cartridge BB things get different, but thinking about it my method would also work for removing a cartridge body. Silly, silly me. Of course it won't work for removing a cartridge body since the "fixed cup" side has no wrench flats. Then again, since the OP was trying to remove an adjustable cup we're obviously dealing with an old-timie c&c BB. jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3 |
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Removing a stuck adjustable cup (Bottom Bracket)
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Removing a stuck adjustable cup (Bottom Bracket)
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#15
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Removing a stuck adjustable cup (Bottom Bracket)
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#16
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Removing a stuck adjustable cup (Bottom Bracket)
Peter Cole wrote:
Usually adjustable cups aren't too hard to remove after you get the lockring off. I've had good luck with the "punch and mallet" method. If you need penetrating oil, try "PB Blaster" -- handy stuff to keep around. I've found Aero Kroil or regular Kroil to be the most effective penetrating oil in my experience. YMMV but it seems appropriate in this situation. |
#17
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Removing a stuck adjustable cup (Bottom Bracket)
Brian Huntley wrote:
There's no way a pin-wrench is going to be able to budge the supposedly non-fixed cup (ie left side) on my all-weather commuter bike. I'm fairly sure the fixed-cup is also immobile, and this is the time of year I usually replace the bearings (it's an old cup-and-cone style bb.) What are my options? I'm thinking I could possible file some flats on it and apply the big wrench, then replace it, but I seem to recall these are really hard steel. The pin-wrench holes don't seem to be deep enough to allow me to stick a punch in one and whale on it with a mallet. Would a torch help? (It's steel-on-steel, so I'm guessing not.) Some super-duper penetrating oil? This is probably this frame's last year (I've said that before), but I would like to make it last until June at least. You're on the right path. When we confront rusted steel cups in steel frames, we remove the lockring, grind flats on the cup with a disc grinder, fasten a 30 inch adjustable wrench to the cup with a tool that bolts to the spindle and pull hard. The vibration from the disc grinder seems to help. BB cups are good steel and hardened - a file isn't much help. You run the risk of nicking into the frame when you cut the flats but except for aesthetic purposes that probably doesn't matter. Before grinding the left cup, do try a long wrench bolted to the right cup. For some reason the left cups installed without grease are usually matched with a right cup that was never properly tightened. I did once weld a long piece of steel to a cup but it was more trouble than it was worth. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
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