Author Topic: Gearbox Rebuild - Bearing Fit  (Read 2648 times)

Offline brackenfel

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  • Adrian - Bristol UK
Gearbox Rebuild - Bearing Fit
« on: 07.07. 2010 14:37 »
Sorry to be monopolising the Forum a bit at present but at least it proves I'm working on the A10!!

I'm re-assembling the gearbox but the "small gearbox bearing 67-4217" is proving troublesome in that the mainshaft will not slide through it. I have 2 mainshafts (one spare) & both have the same problem so it's not the shaft. I'm not sure whether the manufacturing tolerance an issue here but the bearing came from a good supplier (C&D Autos). I can get the shaft about 1/4" in either side by hand & "waggling" but that's it.

I'm faced with the choice of either drifting the shaft through the bearing in the inner case and then fitting the whole thing as a unit into the gearbox body or fitting the shaft & forcing the inner casing on - neither very appealing..

Do I need to just be brutal & get on with it? Has anyone else had similar problems or have I got a duff bearing?

Thanks,

Adrian
1961 A10 650 Golden Flash - Blue
1954 BSA B33
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Offline A10Boy

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Re: Gearbox Rebuild - Bearing Fit
« Reply #1 on: 07.07. 2010 19:33 »
If its only tight by a micron or two, [small], stick the shaft in her freezer for a couple of hours then push into the bearing. the case can be warmed in her oven so the bearing goes in more easily.. It makes all the difference.
Regards

Andy

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Offline alanp

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Re: Gearbox Rebuild - Bearing Fit
« Reply #2 on: 07.07. 2010 19:49 »
Just a personal preference for me is a snug (good old fashioned expression) fit rather than a tight interference. This helps assembling the gears, shafts and selectors before fitting the end cover with a touch of gentle rubber mallet persuasion on the cover while holding the selector in the correct position with the dots in line. A very light rub with a fine emery cloth will do the trick, measuring the shaft diameter so that you don't overdo it, we don't want a lose fit.
Alan
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Online muskrat

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Re: Gearbox Rebuild - Bearing Fit
« Reply #3 on: 07.07. 2010 20:24 »
G'day Adrian,
                     both mine are a snug fit, and as Alan said, a bit of gentle persuasion with a hide mallet to get the cover home and slide hammer over the nut to draw the shaft home.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Offline brackenfel

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Re: Gearbox Rebuild - Bearing Fit
« Reply #4 on: 08.07. 2010 08:53 »
Many thanks all..

I now know which way to go & will try the freezer approach as I can't find my emery cloth at present!! Now where did I put those gaskets.. *smile*

Cheers,
Adrian
1961 A10 650 Golden Flash - Blue
1954 BSA B33
Velocette Viper
Laverda 750 SF1
Kawasaki W650
Buell XB9S
Ariel 350NH & Matchless G3LS in bits...