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Lucas D45/C45 Generator pully thread type

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Hi

 

Does anyone know the the thread that is used on 1940's lucas generators ? According to the parts list it is 'special' which probably means that it is an odball size.'

 

I had to cut mine so that generator could be taken apart to be repaired, so I am after a replacement.

 

It is not 5/8 UNF (18tpi) , it is more like M17 fine (20tpi), if it is this any ideas where I can get one

 

Cheers

Richard

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Posted (edited)
Hi

 

Does anyone know the the thread that is used on 1940's lucas generators ? According to the parts list it is 'special' which probably means that it is an odball size.'

 

I had to cut mine so that generator could be taken apart to be repaired, so I am after a replacement.

 

It is not 5/8 UNF (18tpi) , it is more like M17 fine (20tpi), if it is this any ideas where I can get one

 

 

Cheers

Richard

 

Richard,

I take it you have measured OD of thread and that it is 5/8" ? If so it could be British Cycle thread (CEI) as on 5/8" size there were two, one being 26 tpi and the other 20 tpi, (thread angle 60 degs) I recall Lucas using CEI thread on some components in those days.

 

Certainly would not be metric in those days.

 

 

regards,

Richard

Edited by Richard Farrant

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Thanks Richard

 

I wasn't aware of the 20tpi British Cycle Thread (only ever used the 26tpi one)

 

Thread is 20tpi (looks like 60 degree)

 

Inner thread diameter is 0.637" and thread depth is 0.025"

 

This makes it as CEI 11/16" 20tpi thread, so just got to find/make a nut

 

see http://www.motalia.com/Html/Charts/cycle_chart.html

 

for CEI thread datails

 

Cheers

Richard

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