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Shimano BB removal

Old 12-12-06, 07:43 PM
  #1  
jaws
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Shimano BB removal

I have a new bike with a Shimano Ultegra 6603 crankset. I purchased the bike for the purpose of using the drivetrain on another bike and am in the process of stripping it. My problem is that the bottom bracket refuses to loosen. I know about the reverse threads on the right side. I have the prescribed Shimano tool to use on the adapters but cannot get them to break free. I have put so much pressure on the wrench that I am afraid of racking the frame and also have tried tapping on the handle of the wrench with a hammer - all that does is mess up the notches on the adapter. Shimano's exploded view does not show any locking mechanisim that would keep the outside adapters from unscrewing. Help - What am I missing?
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Old 12-12-06, 08:13 PM
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Assuming you're turning in the correct direction, they should come off pretty easily. I don't think you'll hurt the frame. Nothing left to do but crank on it, right?
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Old 12-12-06, 08:22 PM
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ummm...I may be wrong...but aren't the "reverse" threads on the left side?

The phrase I use to remember the reverse threads is "Back Off", meaning, to remove, turn <whatever> towards the back. So when I'm taking off the right pedal, I put the wrench on, handle up, and pull it towards the back. To me...the right side is threaded standard (righty-tighty, lefty-loosey). Following this logic, pulling the wrench handle towards the back on the left side means that the reverse threads are on the left side and NOT the right side.
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Old 12-12-06, 08:25 PM
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Depends on what you mean by left and right sides .
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Old 12-12-06, 08:38 PM
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The right side is right as you are sitting on the bike. There is a label on the adapters showing the right side as being reverse thread and the left standard. The label also denotes L & R and they are on the correct sides.
This is backwards as to the way pedals are threaded. I thought that is a little strange.
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Old 12-12-06, 08:45 PM
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Well dang jaws...you're right. I remembered that I had a BB-6500 in the garage and went out to take a look. Sure enough, it's opposite of pedals...reverse threads are on the right side (as you sit on the bike...facing forward!). Sorry to lead ya on a wild goose chase, although I'm glad I re-learned this (I built my bike up from the frame) since I'm gonna switch to a double in the spring and will have to take out the BB!
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Old 12-12-06, 08:48 PM
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If it's an Italian frame the BB will not be reverse thread.
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Old 12-12-06, 08:59 PM
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Originally Posted by Louis
If it's an Italian frame the BB will not be reverse thread.
It's English thread
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Old 12-12-06, 09:12 PM
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Originally Posted by jaws
It's English thread
Hmmm...Perhaps a bit of leverage amplification is in order. A piece of pipe on the handle might do it.
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Old 12-13-06, 08:33 PM
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Originally Posted by Louis
Hmmm...Perhaps a bit of leverage amplification is in order. A piece of pipe on the handle might do it.
Got it apart by using the leverage amplification method. I used a 2' length of pipe as an extension on the wrench handle. I held the frame steady in the workstand and my 20 year son turned the wrench. It must have been torqued to 150 lbs as it took both of us to break it loose. Don't know why it was so tight. Thanks for all the input.
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Old 12-13-06, 10:46 PM
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A 2 foot length of pipe is the wrench equivalent of a "bigger hammer". No tool kit is complete without one of each.
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