|Can't get Bottom Bracket out||eciofi18|
Jul 25, 2002 4:03 PM
|I cannot remove my bottom bracket for some reason. It feels like it's welded in there. I can get the non drive side off fine, but the crankset side won't budge. I have a campy Record BB on a Bianchi aluminum frame. I'm using the right tools and even the local bike stores can't get it out. Anyone ever have this problem before and how do you think I should try to get it out? I don't care if i destroy the BB, I just don't wanna damage the frame.|
|re: Can't get Bottom Bracket out||grzy|
Jul 25, 2002 4:17 PM
|I assume you're turning it the correct way. In any event try turning it the other way - you sometimes break things loose this way. Next step is to shoot some liquid Wrench in there and let it soak over night. If that doesn't work then it's time to get serious and apply heat. Get a can of MAP gas and a torch tip. Heat the spindle and cup - you'll cook the grease for sure and probably start a small fire - best to do it outside and not in the basement under the kitchen. You're most likely dealing with corrosion of the aluminum BB shell and I'd put your chances at about 50/50 in being able to use the frame again. You'll probably need to get the threads chased by a BB tap at a LBS - this tool is way to expensive to buy for one use. If any of this makes you nervous then fins another shop with some wiley wrenches. A good one will not give up so easily. You have to be willing to accept the fact that it may be a lost cause.|
|re: Can't get Bottom Bracket out||curlybike|
Jul 25, 2002 4:24 PM
|That should be an Italian thread bb which threads out the same as the non drive side. RH thread not LH like English. Maybe your bike shop has never seen an Italian BB. If it will not unscrew turning CCWise than remove the non drive side and drive the spindle out of the driveside cup. Use a hacksaw and split the cup carefully into several pieces and cace it into the center. You may need to remove the screw from the cable guide to have clearance to drive the spindle out. You need to use a lot of care when splitting the cup as you dont want to ruin the BB shell threads.|
Jul 25, 2002 5:23 PM
|The BB should be marked with the thread. If it says 36 x 24 then it's Italian and is RH thread. If it says 1.370 x 24 then it's English and is LH thread. Put the BB tool in a bench vise and use the leverage of the frame to put max torque on the unit. And if you get it out, learn the lesson to grease things well on assembly and remove, clean, and re-grease annually.|
|Get Professional Help/Advice||Fred the Cross Poser|
Jul 26, 2002 5:52 AM
|I would see someone at a local machine shop (yellow pages) or metal working shop to get some advice on how to drill/cut out the bottom bracket before trying anything with a hacksaw. Chances are that they could mount up the frame on a drilling jig and machine out the cups while maintaining the threads on the frame. And, most of the time these guys would only charge a few bucks (in part because they are interested in the challenge).
Give the liquid wrench lots of time (days/week to work) before doing something drastic like applying a torch. Also, consider that aluminum is heat treated and quenched (often in glycol) to get the right hardness/toughness. Applying heat will definitely weaken the frame.
Note: Most modern Bianchis have english threads. Also, campy bottom brackets have arrows on their face noting the lock (or tighten) direction. Others have posted what to look for in labeling noting englich or italian as well. Yep, I know it is hard to read from the corrosion - try polishing with steel wool.
|Does this mean we should grease the threads?||OffTheBack|
Jul 26, 2002 4:20 PM
|when we install BB cups? The "textbook" answer is don't grease them, but in light of experiences like this, I can't see what it would hurt. What about anti-seize compound?|
|What textbook are you reading?||Kerry|
Jul 26, 2002 6:12 PM
|I have never seen a recommendation to install a BB "dry." Grease, anti-sieze, and teflon plumber's tape are the three common alternatives. Grease works.|| |