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Old 03-23-11, 05:36 AM   #1
Monoborracho
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STUCK - Burley Tandem Bottom Bracket

Last week we picked up a nagging noise in the drive train. We were out of town on spring break and, though the bike shop couldn't fix it, they did isolate the noise as coming from the stoker's bottom bracket.

Burley used a proprietary bottom bracket setup with two sealed bearing held in place with snap rings. Tandems East had the bearing and snap rings to replace. The rings came out with no problem. But the bearings and spindle won't move.

I've been soaking it with PB Blaster (that's the liquid you see in the picture) and using a dead blow hammer and pvc pipe to hit the bearing rather than the end of the spindle.

I'm actually considering building a puller that would tap into the spindle and press against the frame but that seems like overkill.

Am I missing something here? Any ideas on what to do next?





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Old 03-23-11, 06:51 AM   #2
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Double check with Mel at Tandems East, as he's certainly done this many times and talked clients or bike shop techs through the process for 20 years now.

It can be a brute force kind of thing as best as I recall. Given the bearings are being replaced, you can usually get the process started by using the axle to drive out one of the bearings, and then go back and get the other one with a drift. You just need to protect the axle-end from being damaged by using a plastic mallet or a block of wood and your dead blow hammer. Yeah, it ruins the bearing, but you're replacing those anyway.

If you'd like to read up on what folks have done in the past and what guidance they received from Burley, et al, these two archived postings from Hobbes cover the basics.

http://search.bikelist.org/getmsg.as....9912.0123.eml
http://search.bikelist.org/getmsg.as...10009.0311.eml
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Old 03-23-11, 07:17 AM   #3
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Thanks, TG.
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Old 03-23-11, 01:36 PM   #4
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The bearing is coated with red lock tight. What you do is get a socket a bit smaller than the bottom bracket, put it on the bearing and hit the socket. It pops out and you coat the new one with lock tight and drive it in the same way. The snap rings just locate the ends, they don't actually hold the bearings in place. Got to hit the socket pretty hard too. Have fun.
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Old 03-23-11, 01:44 PM   #5
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One other thing. The assembly that you are driving out consists of the 2 bearings and the axle, with a sleeve in the middle. It comes out as one piece and the new assembly has new bearings and a new axle,so you aren't reusing anything. Bang away.
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Old 03-23-11, 02:33 PM   #6
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Originally Posted by car knocker View Post
One other thing. The assembly that you are driving out consists of the 2 bearings and the axle, with a sleeve in the middle. It comes out as one piece and the new assembly has new bearings and a new axle,so you aren't reusing anything. Bang away.
I only have the two bearings, not a new spindle/axle.
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Old 03-24-11, 05:39 AM   #7
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So when you bang out the assembly you will have to press off the bearings. The sleeve that is around the axle will serve to locate the bearings when you press them back on. When I replaced mine it came as a assembly,I got it from Burley themselves, but this was years ago when they were still making the bikes.
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