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Bottom Bracket Cup Troubles

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Bottom Bracket Cup Troubles

Old 07-21-17, 11:56 AM
  #1  
aaronmichael
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Bottom Bracket Cup Troubles

Good morning bicycle friends. Hoping someone can help me out with a first time dilemma. A customer brought their Cannondale SLX in to replace the bottom bracket cups. They complained of a creak in the bottom bracket, said they had the same issue some years ago, replaced the cups and that fixed the issue. Therefore I was going to simply replace the cups again and hope that solved the issue. Unfortunately the drive side cup will not come out. I could not put enough force on the cup with the tool to un-thread it. Found a PVC extension bar and it finally broke free. However, it's still barely spinning (even with lots of force) and doesn't seem to be unthreading. This was a red flag in my book and so I'm not going to touch it anymore till I get some more information. The crank is a FSA SLK-Light and the bottom bracket cups are FSA MegaExo with a 24mm spindle. Any help would be greatly appreciated, thank you!
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Old 07-21-17, 05:26 PM
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rhenning
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I assume you know that it is left hand threaded on the drive side. Roger
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Old 07-22-17, 03:54 PM
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maddog34
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sounds like it may have been cross threaded badly during installation the last time around... and those BB cups come with loctite from the factory, if i recall...

and then... there's the aluminum to aluminum interface corrosion to deal with... shoot some penetrant in from both sides, and begin working the cup back and forth, in both directions... this will work penetrant into the threads eventually...

and if the frame's threads are trashed, there are solutions.....
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