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A10 Rear Wheel Hub assy #24107
04/24/07 8:45 am
04/24/07 8:45 am
Joined: Nov 2006
Posts: 174
Brisbane, Australia
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BSA10 Offline OP
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I have a 1953 BSA A10 S/A that I am having some difficulties with reassembly of the rear wheel hub. The hub is a crinkle type but has 2 Left Hand threaded bearing retaining nuts fitted. One nut retains the LH bearing and the other retains the RH bearing. The bearing distance tube has different length sections on each end and when the whole thing is assembled and fitted to the bike seems the bearings load up when the axle is tightened. Had the right hand bearing fail today.

All the parts catalogues and repair manuals that I have access to show only one retaining nut fitted to the left hand side.
Does anyone know if this hub would have been originally fitted to the A10 and does anyone have a parts diagram for this hub.
Any tips on assembly would be greatly appreciated, especially which way the distance tube goes and if there should be a thrust washer etc.

Cheers and thanks, Graeme


Graeme
1954 A10 Golden Flash
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Re: A10 Rear Wheel Hub assy #24108
04/24/07 11:49 am
04/24/07 11:49 am
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Could be a plunger frame QD. Check this layout. # 23 and 17 -R&L bearing retainers. If not I can dig a bit more.



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Re: A10 Rear Wheel Hub assy #24109
04/24/07 10:03 pm
04/24/07 10:03 pm
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Brisbane, Australia
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Thanks John, The setup is very similar although the distance tube (28)looks different. Mine is longer than this one looks and doesn't have notches in the flanges at each end. I did some measurements and found that the thrust washer that was fitted was causing the bearings to load when tightened. when I bought the bike it didn't have a thrust washer fitted so I guess that is the reason. Still not happy that I can't find a drawing for it, although it might be made up of parts from different hubs. I'll take some photos and repost.
Cheers,
Graeme


Graeme
1954 A10 Golden Flash
Re: A10 Rear Wheel Hub assy #24110
04/24/07 10:56 pm
04/24/07 10:56 pm
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Comox BC Canada
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Graeme

The photos below are of a typical S/A preunit crinkle hub. Only the spline (left) end has a screwed retainer. There are no threads on the other end and you can see the distance tube sticking out to take a little spacer ring. That is most likely the longer spacer end.

Gordo

PS: What S/A frame do you have as most refs start the S/A frame in 54?





Without frequent roadside repairs there is no fun in riding!
Re: A10 Rear Wheel Hub assy #24111
04/24/07 11:26 pm
04/24/07 11:26 pm
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This should be a plunger crinkle with the inside threads at both ends. The other bit is the distance tube, the ends can slide.

Gordo






Without frequent roadside repairs there is no fun in riding!
Re: A10 Rear Wheel Hub assy #24112
04/25/07 1:49 am
04/25/07 1:49 am
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Thanks for the info. It seems that I might have a combination of a plunger QD (with threads both ends) and a S/A distance tube. The distance tube in Gordo's photo is not the one fitted to mine, and the ends don't slide. The hub is definately threaded both ends and is fitted with two retaining nuts.
If it is a combo of both, I guess I could leave the retaining ring out of the RH side, or purchase the correct distance tube. I'd post some photos but I have no idea how. I know there are plenty of posts here to explain how, so I'll give a go later.

Regards, Graeme


Graeme
1954 A10 Golden Flash
Re: A10 Rear Wheel Hub assy #24113
04/25/07 1:50 am
04/25/07 1:50 am
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Brisbane, Australia
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By the way Gordo, it might be a 54. Frame number is CA7508.


Graeme
1954 A10 Golden Flash
Re: A10 Rear Wheel Hub assy #24114
04/25/07 2:09 am
04/25/07 2:09 am
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Posts: 2,795
Comox BC Canada
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Graeme: One thing I did not mention is that the plunger hub is longer on the non-spline side. The flange sticks out past the outer crinkle edge about 4 mm while on the S/A the flange is about 2mm short of the outer crinkle edge. 6mm is quite a difference in my mind when you are lining up the bits. It might not be obvious in the photos above but you can clearly see how the flange in the plunger sticks up.

Gordo


Without frequent roadside repairs there is no fun in riding!
Re: A10 Rear Wheel Hub assy #24115
04/25/07 2:24 am
04/25/07 2:24 am
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Posts: 174
Brisbane, Australia
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Gordo: Great info thanks. It is definately a plunger hub as it sticks out about 4mm. So I have a combo hub from someones elses creativity.
I think I might get a plunger distance tube and try that.
Do you know if the axle diameter is the same on both hubs? I assume it would be but the photo you posted makes it look larger.
Cheers, Graeme


Graeme
1954 A10 Golden Flash
Re: A10 Rear Wheel Hub assy #24116
04/25/07 5:04 am
04/25/07 5:04 am
Joined: Sep 2001
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Comox BC Canada
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Graeme: The plunger spindle is about 0.875 inches while based on singles crinkles the S/A spindle is only 0.685. The difference is accounted for by the fact that the plunger distance tube does not go into the inner bearing like the S/A distance tube. It just sits between the bearings. The plunger spindle makes direct contact with the inner bearing as it goes through.

Gordo


Without frequent roadside repairs there is no fun in riding!

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