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 Post subject: BB issue
PostPosted: Wed Oct 23, 2013 9:36 pm 
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Joined: Tue Jun 03, 2008 4:31 pm
Posts: 740
After a couple of hundred miles on my fixed pre war Dawes I noticed that the Bb was moving to the right. It went about a cm!
I pushed it back and finished the ride. When I took it out to check I realised that the BB was threaded into a sleeve. It was that which was moving. There are absolutely no signs of any brazing etc . Am I correct in assuming that this sleeve would have been pressed in.
Am I missing something.
The BB shell looks just like a normal BB albeit with no threads and about 4mm greater in diameter.


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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 9:00 am 
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Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1321
Location: Cotswolds
You might have a Baylis Wiley unit bottom bracket. These were mainly used in bronze welded/fillet brazed frames, but also as a repair.
The RH cup has a flange similar to a standard cup, but with a taper that is supposed to help locate it. The LH cup has a locking ring with a similar taper. Generally these were also located by a longer greaser. Probably the bracket shell has stretched slightly, due to being ridden with the sleeve being slightly loose.


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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 1:23 pm 
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Joined: Mon Mar 02, 2009 4:22 pm
Posts: 1481
Could also be a Thompson bottom bracket - they had pressed-in cups with the thread on the axle, but I've never popped mine out to compare the size with a conventional threaded one. A good idea in principle, but in practice they work loose and the cups make creaking noises in the bottom bracket shell.


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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 2:29 pm 
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Joined: Tue Jun 03, 2008 4:31 pm
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The original BB is out. It just came out like any other cottered BB. Currently running a no name cheapy to match the fixed wheel.
It does have a grease port but its just a very short tube in the shell by the seat tube. I wonder if something is missing which holds this tube in.
It is one tube all the way through with normal English threads on it. I can assemble the BB in it. Indeed when the pedals were taken off I pushed this BB with this shell threaded on , out by hand. The frame would be too big for a "normal" BB even if this was put in to replace knackered threads.


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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 2:52 pm 
rBoTM Winner
rBoTM Winner
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Joined: Tue Aug 26, 2008 7:48 pm
Posts: 455
Location: N. Herts
Hi, assuming it is an BW oil bath B/B, it works with by clamping type arrangement, the lock ring should have a lip on it. It could of come loose for two reasons, the locking ring is not correct, or the actual B/B shell has worn a touch and the ring was not clamping on it. I have had this happen to me and I had a friend of mine, take off some of the lip off, on a lathe. Put a photo up, if you can, just to make you aware the oiler should not really be stopping it rotate, the clamping should. Terry


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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 4:10 pm 
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Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1321
Location: Cotswolds
Is the locking ring in place, or missing?


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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 4:46 pm 
rider | rBoTM Winner
rider | rBoTM Winner
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Joined: Fri Jan 25, 2008 1:42 pm
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Location: Wakefield, Yorkshire
Drawing of the Bayliss-Wiley unit. Is it like this? According to the drawing there should be shouldered cups both ends.


Attachments:
ComCycBB.2.A.jpg
ComCycBB.2.A.jpg [ 142.97 KiB | Viewed 313 times ]
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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 7:24 pm 
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Joined: Tue Jun 03, 2008 4:31 pm
Posts: 740
No lockring on this bit of tube. Is that what you mean? It looked just like part of the frame. It didn't know it was there until it moved. I can't say if it was painted as there isn't much of that on the frame!
Is that inner sleeve part of the BW BB?
Maybe its moved as I am using a modern BB which of course has no left lockring, just a plastic cup that does not protruded past the shell.


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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 7:33 pm 
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Joined: Sun Aug 22, 2010 7:07 pm
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Location: Cotswolds
As you can see from the drawing, it is held in by a locking ring on the adjustable cup, which you do not have, so there is nothing to stop it moving across.


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 Post subject: Re: BB issue
PostPosted: Thu Oct 24, 2013 8:54 pm 
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Joined: Tue Jun 03, 2008 4:31 pm
Posts: 740
And there is the bugger.
Haven't got a square taper Bb with a big lockring.
Suspect it may get a smudging of mig weld.


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