Bottom Bracket Clicking Question

[Zack]

My sam has developed a weird thing.

There is like a grinding sound at the same point of every revolution of the crank arm.  I removed the chain and confirmed that the grinding sound still happens, so it appears to be related to the bottom bracket.

Any ideas on what this is?  

Bottom Bracket is not too old, definitely way less than 10,000 miles.

It is not the pedals either, happens if i hold the crank itself and move it through rotation.  

[PATRICK MOORE]

It sounds as if the bearings have been contaminated. Since you say "Sam", I guess this is a Tange cartridge bb assembly? I've successfully cleaned cartridge bearings by prying the dust shields aside and flushing the bearings, either with WD-40 and the little straw, or simply by swishing them around (that's a specially-learned technique used for high-precision bits) in mineral spirits.

Otherwise, get yourself a new bb bearing assembly.

Patrick Moore, pedantically calling the bb bearing assembly by its proper name in ABQ, NM.

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"Believe nothing until it has been officially denied."
                                                   -- Claude Cockburn

-------------------------
Patrick Moore, Albuquerque, NM, USA
For professional resumes, contact Patrick Moore, ACRW
http://resumespecialties.com/index.html
-------------------------

[Zack]

yep, sam, yep, tange bottom bracket.

took to LBS, they said bearings were the culprit, just having them replace BB rather than mess with it.

thanks for the response patrick!

[Zack]

Ok this is plain weird.

My wife came home and said "something is wrong with my bike"

I just checked and the exact same thing is happening on her betty as on my sam.

So the constant here is me, as I took both cranks off our bikes to swap chain rings.  I put the cranks back on and greased the bolt before putting back on.  I tightened both snug with some force but didn't go crazy tightening up.  They are both tange bottom brackets with sugino XD2 cranks.  

I have to imagine I have done something to cause this, but have no idea what.  

further ideas?

[Marc Schwartz]

Bad batch of Tange-rines?
________________________________________
From: rbw-owne...@googlegroups.com [rbw-owne...@googlegroups.com] on behalf of Zack [zac...@gmail.com]
Sent: Friday, September 14, 2012 3:49 PM
To: rbw-owne...@googlegroups.com
Subject: [RBW] Re: Bottom Bracket Clicking Question

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[Michael Hechmer]

It's hard to imagine what you could do to contaminate a sealed BB.  It's easier to imagine being the outlier on the tail end of the quality distribution curve.  The good thing about higher end, eg White or Phil Wood,  they would make good on these.

Michael

[Robert Barr]

Zack,

I chased a bottom bracket click for months on my MB3 commuter. I took it to the LBS and they pulled the bottom bracket, pronounced the bearings good, snugged it up, and I went off without a click. Three weeks later my click was back. I went back to the shop and we repeated the process. The shop owner is first rate and checked everything. For a second time he pulled the cable routing bracket on the bottom of the shell to make sure there was no interference with the set screw, checked the bearings, and reassembled. No clicking for about two weeks, then back it came, most pronounced when I was climbing. During this long process I was occasionally pulling my crank and playing with chain ring size and chain line - not actually doing anything to the BB, other than maybe torquing it a bit as I tightened the crank bolt. I went back to the LBS. The owner repeated our now normal process - but asked that I not do anything  with the cranks for a bit. To shorten the story - as long as I didn't take off or tighten the crank the clicking stayed away. Our final thoughts are that when I would take off the crank and put it back on I would very slightly loosen the BB (or BBBA) and it would loosen with use. The initial loosening of the BB was subtle with no observable change, but when the clicking started the BB would be loose enough to ever so slightly tighten. It was "the curious case of the clicking BB", and I am glad it is solved.

Good luck, Bob

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