Lotus Elan

Diff Drain Plug Thread

PostPost by: Donels » Mon Sep 24, 2018 5:59 pm

Does anyone know what the thread size is for the diff drain plug on a 1972 +2?
Some gorilla has tightened the plug and stripped the thread. It has just enough purchase to refit and be carefully tightened and I used Loctite to hopefully ensure it holds. However, it really needs a helicoil.
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PostPost by: types26/36 » Mon Sep 24, 2018 6:11 pm

I believe it is 1/2" unf
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PostPost by: richardcox_lotus » Mon Sep 24, 2018 6:12 pm

Paul Matty can supply a replacement.

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PostPost by: Donels » Mon Sep 24, 2018 6:46 pm

Thanks for the info Brian but these are sump plugs. The diff housing is Lotus unique, does your 1/2" unf refer to this?.

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PostPost by: types26/36 » Mon Sep 24, 2018 6:55 pm

Opps :oops: sorry didnt read Diff.
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PostPost by: CBUEB1771 » Mon Sep 24, 2018 7:10 pm

The fittings in the differential housing are all BSPP,
Drain: 1/4 BSPP
Fill: 1/2 BSPP
Breather: 3/8 BSPP
The plugs are all brass and use fiber crush washers.
Last edited by CBUEB1771 on Tue Sep 25, 2018 9:27 am, edited 1 time in total.
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PostPost by: Donels » Tue Sep 25, 2018 8:25 am

Thanks Russ.
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PostPost by: billwill » Tue Sep 25, 2018 11:22 am

They are probably standard plumbing parts in Britain.
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