Okay, here's the long version.
For the engine drain plug,
1/4-inch BSPP or G-1/4 (plus a sealing washer)
see: http://mgaguru.com/mgtech/engine/of108.htm
and http://mgaguru.com/mgtech/cooling/cool_201.htm
For gearbox drain, and differential fill and drain plugs,
1/2-14 NPT (plus thread sealing, recommend Tefon tape)
http://mgaguru.com/mgtech/rearaxle/ra117.htm
Original plugs had square female socket drive,
slightly tapered (forged), and could be two
different sizes. The smaller one can be driven
direclty with a 3/8" drive socket wrench without
a socket or adapter. The larger one needs a
slightly larger tapered square male drive key
(which can easily be made from a 3/8" to 1/2" drive adapter).
Hex female socket, square drive and hex drive
heads are also available, but, recommend a flush
socket drive plug for bottom of gearbox and differential.
At 10:43 AM 3/22/2020, dave wrote:
>What size are they?
>-----Original Message-----
>From: Barney Gaylord <barneymg@mgaguru.com>
>Sent: Sunday, March 22, 2020 9:36 AM
>To: dave <dave@ranteer.com>; mgs@autox.team.net
>Subject: Re: [Mgs] mga drain plugs
>
>Gearbox and differential have NPT plugs (tapered pipe threads). Engines
>have BSPS drain plug (British Standard Pipe Straight thread),
>or BSPP (British Standard Pipe Parallel thread),
>and that one needs a sealing washer.
>At 03:36 PM 3/21/2020, dave via Mgs wrote:
> >....
> >The mga and mgb transmission and oil drain plug I?m wanting to get
> >magnetic ones to catch shavings, etc.
> >
> >They are ½? npt?
> >....
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