Lotus Elan

More plugs.

PostPost by: Bombay Racing Green » Mon Sep 02, 2013 7:51 pm

Hello,

What sizes are the 4 speed gearbox filler plug and sump plug respectively? I assume they are a whitworth size.

Thanks in advance.

Pete
Pete
1970 S4 DHC
1971 S2 Europa
1968 +2
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PostPost by: RichardHawkins » Wed Sep 04, 2013 7:45 pm

Pete,

I have just measured the plugs on my 4 speed gearbox, without removing them. Judging by the outside diameter they are either 3/4 inch BSPT or NPT, both are very nearly the same outside diameter with 14 threads per inch. The thread profile of BSP and NPT are also similar, so that they are often practically interchangeable. This is not true of all nominal sizes. As Ford are an American company and were using American thread systems in Britain when our cars were new, I expect these plugs are 3/4 inch NPT. I expect if you go to a plumbers merchant you will be able to find a 3/4 inch BSPT plug to fit.

If you want me to remove the plugs and check mor carefully please reply.

Richard Hawkins
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PostPost by: Bombay Racing Green » Thu Sep 05, 2013 3:29 am

Hi Richard,

Thank you very much for the help and sizes. I shall plan on that accordingly.

Cheers,

Peter
Pete
1970 S4 DHC
1971 S2 Europa
1968 +2
Bombay Racing Green
Third Gear
Third Gear
 
Posts: 249
Joined: 05 Sep 2012
Location: Wicklow, Ireland

PostPost by: Bombay Racing Green » Thu Sep 05, 2013 6:16 pm

After abit of experimenting, a twelve point 17 mm socket was sufficient to loosen both plugs off. A 15 mm spanner also fitted but I didn't have enough leverage.

Pete
Pete
1970 S4 DHC
1971 S2 Europa
1968 +2
Bombay Racing Green
Third Gear
Third Gear
 
Posts: 249
Joined: 05 Sep 2012
Location: Wicklow, Ireland

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