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Thread: Lucas D45/C45 Generator pully thread type

  1. #1
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    Default Lucas D45/C45 Generator pully thread type

    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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  3. #2
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    Default Re: Lucas D45/C45 Generator pully thread type

    Quote Originally Posted by 64EK26 View Post
    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
    Last edited by Richard Farrant; 17-05-2017 at 19:32.
    Richard Farrant

    1943 Bedford QLD - 1941 BSA WM20 - 1943 Daimler Scout Car Mk.2
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  4. #3
    Join Date
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    Default Re: Lucas D45/C45 Generator pully thread type

    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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