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1932 International engine sprocket

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1932 International engine sprocket

Posted by andy_buchan at November 20. 2018

Any suggestions where I can source an engine sprocket for my 1932 International 490.

It has a cam type of boss on it, I have seen this described as a cush drive.  Sprocket rotates freely on the output shaft and engages through another cam shaped boss engaged by a spring.  (such a technical description.  I could have said it was black)

 

Also looking for a primary drive sprocket to fit the clutch, its a 6 spring affair.

20 teeth and 42 teeth for the primary.

I could machine off and weld on the original centres, just wondered if there was a more straightforward route.

kind regards,

Andy

 

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Re: 1932 International engine sprocket

Posted by Gerardo Zamparutto at November 21. 2018

Estimado Andy: puedes cambiar el engranaje, el único problema es la temperatura generada por la soldadura y eliminar el tratamiento térmico (la dureza del nuevo engranaje) que quizás sufra un desgaste prematuro (hay una pequeña distancia según la foto que enviaste).

Esta es mi modesta opinión (traducida con Google no hablo inglés)

Saludos, Gerardo desde Argentina.

Re: 1932 International engine sprocket

Posted by andy_buchan at November 21. 2018

Previously Gerardo Zamparutto wrote:

Estimado Andy: puedes cambiar el engranaje, el único problema es la temperatura generada por la soldadura y eliminar el tratamiento térmico (la dureza del nuevo engranaje) que quizás sufra un desgaste prematuro (hay una pequeña distancia según la foto que enviaste).

Esta es mi modesta opinión (traducida con Google no hablo inglés)

Saludos, Gerardo desde Argentina.

 

 

Thank you for your message.  Yes the heat treating is in my thoughts if I need to cut and paste the sprocket teeth, but I guess needs must if I cant find an "off the shelf" solution.

kind regards,

Andy

Re: 1932 International engine sprocket

Posted by richard_cornish at November 21. 2018

Hi Andy,

   As far as I know, no-one makes these sprockets so it depends if you want to keep the bike original or whether you want to up-date the parts for later ones. This Sturmey Archer transmission was used for 1932 and 3, but was changed for 1934 by fitting the Norton 3 spring clutch with the shock absorber inside. This was used on all models until the mid '50s and will fit onto your bike but you will have to check the chain alignment. The later engine sprocket will fit your main-shaft but check it is the correct Inter sprocket as the Dominator one is very similar but just a bit bigger.

   If you want to keep the original set-up you might be able to use an engine sprocket from another make as several machines used this system into the 1950s. The clutch chain-wheel bolts onto the drum so might not be too expensive to have made.

Regards,  Richard.

Re: 1932 International engine sprocket

Posted by andy_buchan at November 22. 2018

Previously richard_cornish wrote:

Hi Andy,

As far as I know, no-one makes these sprockets so it depends if you want to keep the bike original or whether you want to up-date the parts for later ones. This Sturmey Archer transmission was used for 1932 and 3, but was changed for 1934 by fitting the Norton 3 spring clutch with the shock absorber inside. This was used on all models until the mid '50s and will fit onto your bike but you will have to check the chain alignment. The later engine sprocket will fit your main-shaft but check it is the correct Inter sprocket as the Dominator one is very similar but just a bit bigger.

If you want to keep the original set-up you might be able to use an engine sprocket from another make as several machines used this system into the 1950s. The clutch chain-wheel bolts onto the drum so might not be too expensive to have made.

Regards,  Richard.

Thanks Richard.

I am going to try and keep the original set up if possible.  Looks like I might have to cut and paste the sprockets.

kind regards,

Andy

Re: 1932 International engine sprocket

Posted by paul_standeven at November 22. 2018

Ken McKintosh is a maker of Manx Norton parts in Auckland, New Zealand.  He once had a 1932 International, which he was piecing together.  I know he managed to get an engine shock absorber sprocket assy.  It might be worth contacting him, tho' the bike will be a sore point with him - there was a raid on his workshop and the bike (among others) was stolen and never recovered

Paul

Re: 1932 International engine sprocket

Posted by Gerardo Zamparutto at November 23. 2018

My 16h has 5/8"pitch gears, they have ASA 50, standard chains, i think you can easily get 5/8" gear with the number of teeth you need in agricultural spare parts stores (to later turn and weld them).

Gerardo.

Re: 1932 International engine sprocket

Posted by jonathan_newton at November 23. 2018

Previously andy_buchan wrote:

Previously richard_cornish wrote:

Hi Andy,

As far as I know, no-one makes these sprockets so it depends if you want to keep the bike original or whether you want to up-date the parts for later ones. This Sturmey Archer transmission was used for 1932 and 3, but was changed for 1934 by fitting the Norton 3 spring clutch with the shock absorber inside. This was used on all models until the mid '50s and will fit onto your bike but you will have to check the chain alignment. The later engine sprocket will fit your main-shaft but check it is the correct Inter sprocket as the Dominator one is very similar but just a bit bigger.

If you want to keep the original set-up you might be able to use an engine sprocket from another make as several machines used this system into the 1950s. The clutch chain-wheel bolts onto the drum so might not be too expensive to have made.

Regards,  Richard.

Thanks Richard.

I am going to try and keep the original set up if possible.  Looks like I might have to cut and paste the sprockets.

kind regards,

Andy

I seem to remember Vespa used a similar cush drive cam arrangement.   With modern tech you may be able to graft  one ito the center of a standard sprocket?

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