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Eccentric bb maintainence

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Eccentric bb maintainence

Old 04-30-19, 01:54 PM
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headasunder
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Eccentric bb maintainence



Having recently returned from a 5 day trail/gravel bit of everything ride our tandem developed a decent creak coming from the front end somewhere. On returning I thoroughly washed and lubed the bike(it was mud encrusted) the creak started on the first ride after that, I suspect my pedals but am aware of all the other likely culprits. I thought I would take the opportunity to strip out the ebb and clean all the interfaces, its a wedge type with a single cap screw that tightens the wedge the frame is alloy, is grease all that is required inside the shell and on all the mating surfaces or is there another product thats recommended also the wedge cap screw has no listed to torque setting I have always just nipped it reasonably tight and it hasnt moved but wonder if anyone has a number. Ive added a couple of pictures purely to inspire anyone coming to the shaky isles to ride the alps2ocean trail a superb experience..

Last edited by headasunder; 04-30-19 at 02:08 PM. Reason: pictures
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Old 05-01-19, 02:10 AM
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I pulled out the ebb this afternoon the square taper inside it was knackered, replaced and greased everything biggish ride scheduled for tomorrow so heres hoping.
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Old 05-02-19, 08:10 PM
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I canít help with the number but glad I clicked on the thread. What a picture - well done.
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Old 05-02-19, 11:24 PM
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Originally Posted by due ruote View Post
I canít help with the number but glad I clicked on the thread. What a picture - well done.
Looks like a good trip. Where was this?


Anyone with a wedge EBB would benefit from this:

Don't take a hammer to the bolt to un-wedge it. Your EBB will probably have an access hole on the opposite side which will allow you to thread another bolt in from the other side. The best way to do this is loosen the bolt in the EBB, then introduce the second bolt on the other side before removing the original EBB bolt. Run the new bolt through a washer (or one or two stacked cone wrenches - the holes are perfect) and into the EBB. The idea is to catch the threads with the new bolt as the original bolt unscrews. I recommend this so that the barrel nut inside the EBB doesn't shift, preventing the new bolt from engaging the hole and threads. Once the new bolt has engaged the threads, you may remove the original bolt. Then tighten down the new bolt you installed (with grease on head and threads) to dislodge the wedge. This works great for wedges that have been in a long time and/or without adequate or disappeared grease.

I just had to mention this because I've seen enough recommendations to "hit it really hard with a hammer," which I consider bad advice and a great way to bend the wedge bolt and do all sorts of damage to the EBB and BB shell and environs.

My $0.02
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Old 05-03-19, 04:02 PM
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Might be another place for the grease with grit in it AKA carbon paste ..
around the eccentric so it won't get stuck, the grease part , but the grit bite keeps it from rotating
so you don't have to tighten it so hard, in the frame..
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Old 05-03-19, 06:30 PM
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I use marine anti-seize on mine.
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