64EK26 Posted May 17, 2017 Share Posted May 17, 2017 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 Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted May 17, 2017 Share Posted May 17, 2017 (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 May 17, 2017 by Richard Farrant Quote Link to comment Share on other sites More sharing options...
64EK26 Posted May 18, 2017 Author Share Posted May 18, 2017 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 Quote Link to comment Share on other sites More sharing options...
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