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Ultegra sline and Dura Ace Crank wont seperate(7 posts)

Ultegra sline and Dura Ace Crank wont seperateexplore160
Sep 2, 2002 5:54 PM
I upgraded my Trek 5200 with Dura Ace components except for the bottom bracket where I decided to use a new Ultegra Bottom bracket. After putting 2,000 miles on the bike I have tried to seperate the cranks but they will not come off the BB! I have removed both the seal ring and the inner bolt but neither crank will budge off the BB. I cannot use the old bottom bracket tool since the BB has a hollow shaft. According to the manual the cranks should just fall off once the retaining bolts have been removed but they arent moving. Any suggestions? I have even screwed on the old BB tool and using a hammer and long screw driver tried to drive the crank off the bottom bracket but even this does not seem to help. Any suggestions would be great - I cant see where I would be missing something simple but I hope I am.


re: Ultegra sline and Dura Ace Crank wont seperatemerckx56
Sep 2, 2002 6:07 PM
put the bolt back on the crank and then re-install the little ring with the two holes. make sure everything is tight! then loosen the crank bolt. it's a self-extracting design. it will basically pull itself off of the spline. it's not supposed to just pop off when you remove everything. shimano does make a tool to remove the cranks if yoy should choose NOT to use the self-extracting feature.
re: Ultegra sline and Dura Ace Crank wont seperatecurlybike
Sep 3, 2002 6:53 AM
Shimano sells a plug to go in the hollow axle so a puller will work. This should not be required if you use the self puller. If the self puller cap gets destroyed because the arm is stuck you will have to use the old style puller. If it is really stuck, you can try using a hot air gun on the crank arm to expand it slightly. Next time grease the splines.
Right Tool for the Jobgrzy
Sep 3, 2002 8:27 AM
You can either use the self extracting feature with is not without a slight risk OR you can get the right crank arm extractor.
Or the stand-in option is....Kurt H
Sep 3, 2002 9:53 AM
You can use the old tool, take the frame into your local hardware store, and find a few washers that are small enough to fit in the area previously occupied by the crank bolts, but that will sit on the outside rim of the axle. Basically, you want to match the outside diameter of the axle. One probably won't do the job, it will just crush and disfigure. Stack 2-3 washers on the axle and use the old tool to drive against the washers, which will will apply the pressure to the axle. Sure it's a cheap way out, but I was ticked off, my LBS is not so local but the hardware store is, and I really wanted those cranks off! I tried it and it worked without a problem. If you're going to do this all the time, buy the tool. If it's a one time fix, this works. Total cost: maybe 35 cents for a handful of the washers.
Sep 3, 2002 10:02 AM
Stick a couple Oreo cookies in there and save the trip to the hardware store! ;-) Hey, you're dealing with some one who already has everything he needs right in front of him and STILL can't figure it out. It's not an issue of cost (BTW - you spent $0.35 too much). The next thing that will happen is that he'll take your advice, but use washers that are slightly too large and/or not get them centered correctly and start stripping the aluminum splines from the crank arms. If that doesn't happen he'll then then over look the requirement to line up the splines when reinstalling the crank arm and strip the splines this way. I'm not trying to be overly pesimistic - just very realistic based on actual observations over time. You have to keep it simple and fail-safe so that people avoid the pitfalls until they come up the learning curve.
Penetrating Oil to bust up the corrosionteamsloppy
Sep 3, 2002 9:31 PM
Shimano makes a penetrating oil to break up the corrosion of alloy parts that are assembled without anti-seize compound or a high-quality grease.


It might be possible to use "Liquid Wrench" from the local hardware store. Liquid Wrench will stink; don't let it inside your house or apartment.