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Re: Clutch's & Gearbox Question

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Re: Clutch's & Gearbox Question

Posted by brian_west at April 03. 2017

Good Evening All

I have a '57 ES2, which seems 'standard' apart from the gearbox, which is a 'laydown' type (GB8 4***), think it would've originally have had an 'AMC' type.

I was trying to stop a primary chaincase leak when I noticed that the clutch seemed to be the later type ie with a threaded centre adjuster/locknut in the clutch cover plate, (see attached pic) rather than the type that had the band around the basket.

My question is can you have a mixture of gearbox & clutch types? ie early gearbox's with later clutch parts? Benefits advantages etc?

Thanks for your help, Westy

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Re: Clutch's & Gearbox Question

Posted by richard_payne at April 03. 2017

I have a WD16H with a late AMC clutch with the bonded friction back plate. It's an improvement over the postage stamp type inserts.

The 16H has a narrow chaincase so I use the early type steel pressure plate (if you have the dolls head / laydown worm, you don't need the adjuster)

The back plate is slightly thicker too but provided it's been set up carefully and isn't fouling then no problem.

I like the earlier boxes. The worm clutch operating mechanism seems much less stressed than the AMC system and gives a nice light action (although it requires long travel at the lever). Disadvantges are that they have bronze thrust washer which can wear and there is no positive location of the mainshaft....but if you have one and it works, it's certainly nothing to worry about.

1956 was still laydown I believe. When was yours actually made ?

Re: Clutch's & Gearbox Question

Posted by brian_west at April 04. 2017

Hello Richard, factory records show it left the factory in July of 1957 and sent to Casablanca via a shipping agent. It still has the KPH speedo fitted! The engine frame numbers match that record but the gearbox number doesn't, at first I didn't notice that the gearbox was an earlier type, only through reading Roy Bacon's book on Norton Singles after.

It would explain a circular polishing of the inner side of the chaincase adjacent to the clutch cover adjustment screw though! I have attached a couple more pics of  the clutch dissasembled, can you tell if it's late AMC type friction disc's?

Thanks for your reply

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Re: Clutch's & Gearbox Question

Posted by alan_rogers at April 04. 2017

Previously brian_west wrote:

Hello Richard, factory records show it left the factory in July of 1957 and sent to Casablanca via a shipping agent. It still has the KPH speedo fitted! The engine frame numbers match that record but the gearbox number doesn't, at first I didn't notice that the gearbox was an earlier type, only through reading Roy Bacon's book on Norton Singles after.

It would explain a circular polishing of the inner side of the chaincase adjacent to the clutch cover adjustment screw though! I have attached a couple more pics of  the clutch dissasembled, can you tell if it's late AMC type friction disc's?

Thanks for your reply

I have a matching numbers 1957 ES2 "M4", it left the factory December 1956 and has the AMC box.

Re: Clutch's & Gearbox Question

Posted by brian_west at April 05. 2017

Alan thanks for the info, it will have the AMC related clutch too then I guess, trying to confirm the clutch I have, see above images on previous post.

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This message board is a technical forum for Nortons in general. Club related and non-technical items should be put in News and Views and if posted here, will be deleted

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