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Sleeve gear fit in bearing

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Well I've actually started working on the Electra bottom end, rather than just looking at the pile of bits new and old. New bearings fitted to the crankcases, and doing a quick check to see all was OK before going any further. I find that the sleeve gear will not pass right through the new bearing- its about 3/4" proud. I've cleaned the collar on the gear with some fine emery, and there are no visible or tactile burrs or such. Before I get out the big hammer (joke!), how much of an interferance fit should it be? "Moderate pressure"? I dont have access to a press...

Cant find anything in any of the manuals or the L/W Tech notes. Maybe heating the case again in the oven, with the sleeve gear popped in the freezer beforehand like with the bearings?

The bearing in question is unbranded and was sourced from the club.

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Could be the gear is slightly distorted ,it would not have gone in as far as it has if there was a  bearing size issue.  Don't want too tight a fit or the bearing may lose its running clearance. More "fetling" ?.

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Good point about it at least partially fitting Robert, perhaps a little comfort to be found there. So yes maybe a little distortion somehow on the sleeve gear- after all, there's SO much power to deal with;-)

Maybe an overtight primary might have caused that, but with unit construction?

Anyway, looks like some Engineers Blue and a carborundum stone is called for. That should stop me messing about for a bit.....

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When shafts were a bit too tight in bearings John Hudson used to use blue black ,emery in strips ,bandolier  fashion  to take off half a thou from a shaft . John was usually working in someones back yard or kitchen ,   No decent facilities, but he made things work well,including race bikes.

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The bearing should be a SKF 6206 (or similar) -  62 x 30 x 16mm. As mentioned above, it should be a tight sliding fit.

Have you still the old bearing?

It might be useful to heat the casing & drive out the 'new' bearing, and compare the fit on the bench to the 'old' bearing.

That did the trick Robert. Good call, and worth remembering in future.

I actually used a 1" strip cut from a sheet of 800 Wet and Dry. Gripped the gear in the end of my trusty Workmate; marked one pinion with a red felt tip to know when I'd gone round once, and set too, moving the gear round a couple of teeth at a time.

5 minutes and one lap later, tried the gear in the case. Perfect sliding fit- result!

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Happy days !,  Andy's comment  is  worth remembering,  always good to check you don't have a rogue  bearing , Altering a correct   shaft  to  accomodate  an    undersized  bearing   is a  short sighted  error.

I hear what you say Robert. In my case, I think it was simply superficial surface degradation, as the result of 50 years storage in boxes in a variety of lockups.

I'm actually surprised at how well some of the other bits have stood the test of time and neglect.

Also, I'd hope that the club is able to source decent bearings at least, although I suppose, Fings aint what they used to be......

 


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