Author Topic: 1930s clutch sprocket  (Read 335 times)

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Offline saluki42

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1930s clutch sprocket
« on: 16 Feb 2021 at 11:44 »
Hi could anybody tell me if the clutch sprocket on the T6 etc can be unscrewed from the rest of the friction plate assembly as the with the earlier TC models

Thanks
Chris

Offline Doug

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Re: 1930s clutch sprocket
« Reply #1 on: 16 Feb 2021 at 13:35 »
Chris,

It is one piece.

-Doug

Offline saluki42

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Re: 1930s clutch sprocket
« Reply #2 on: 16 Feb 2021 at 15:20 »
Thanks for that Doug my query was prompted by the fact that the parts books show one part number for the sprocket and oil thrower and another of just the sprocket. It looks as if in the case of my beast that the sprocket has been fitted on and then tack welded to the rest  of the assembly. I suppose one option I have if i can't find a straight replacement sprocket is to use a 22 tooth triumph sprocket and re machine the center before tack welding the re worked sprocket as a replacement.

Chris

Offline Doug

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Re: 1930s clutch sprocket
« Reply #3 on: 16 Feb 2021 at 16:26 »
The sprocket is one piece with the hub all the way over to the flange that rivets to the clutch disk. The slinger is sandwiched between that flange and the clutch disk. The same part number was used from the S6 to the Aero 500/600, so probably the same as used on the 1934 big side valve models.



-Doug

Offline saluki42

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Re: 1930s clutch sprocket
« Reply #4 on: 17 Feb 2021 at 16:53 »
Hi again Doug thanks for the inclusion of the drawing but unfortunately it has left me more confused. As you can see from the photo I hope the sprocket is clearly a separate piece to the body add to this the parts listing from 1930 showing that the sprocket can be purchased separately from the other parts of the assembly. Also confusingly in the early thirties they appear to be using an asbestos based bonded friction surface yet in 34 reverted to the older cork inserts. So now I don't really know what I've got on my hands clutch wise.

Chris

Offline saluki42

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Re: 1930s clutch sprocket
« Reply #5 on: 17 Feb 2021 at 16:55 »
Ah It didn't like the photo I'll try again

Offline Doug

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Re: 1930s clutch sprocket
« Reply #6 on: 17 Feb 2021 at 18:38 »
Chris,

Though the spares list says "sprocket", that included the hub and flange as shown in the drawing. For the average owner ordering parts, describing it as a sprocket was more identifiable than calling it a clutch disk center.

The ohv models used a double sided friction plate of Ferodo linings. They also required a pressure plate, usually visible by the two or three drive pegs sticking through the face of the flywheel. I am not sure if they used a single sided Ferodo disk in the thirties on the big side valve models, usually you see the cast aluminum friction plate with the cork inserts. Different story with the 250-350cc models. Those did use a single sided Ferodo clutch disk.

-Doug


Offline Daren W Australia

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Re: 1930s clutch sprocket
« Reply #7 on: 23 Feb 2021 at 08:46 »
Hi not mine but spotted on ebay UK www.ebay.co.uk/itm/Douglas-S6-T6-Parts-1930s-Magnetos-Pancake-Dynamos-Engines-Gearboxes-etc/294027116846?hash=item447561c12e:g:sv8AAOSw7T9gM30E  Douglas S6 T6 Parts. 1930s. Magnetos, Pancake Dynamos, Engines, Gearboxes, etc Daren
too many dougli not enough time!

Offline saluki42

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Re: 1930s clutch sprocket
« Reply #8 on: 23 Feb 2021 at 08:57 »
There are some pieces there that are exactly what I need for my Model Z. Ive asked if he is prepared to part out the clutch just in case.
But thanks for the heads up on that.

Chris

Offline saluki42

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Re: 1930s clutch sprocket
« Reply #9 on: 24 Feb 2021 at 08:40 »
Hi again just to let you know Darren I had a chat with the seller and found out exactly what was in that hoard of parts which proved to be very interesting. Do you know anybody who wants a couple of 99% complete engines, yes I bought the complete collection got lots of fairly rare parts I need for my project and, with some research so I know what I've got  and some cleaning of the bits I should be able to recoup a big part of the cost, I hope.

So thanks again.

Chris

 

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