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MG Midget and Sprite Technical - 1500 gearbox drain plug

I've been stalking this board for years and found it a valuable source to keep our 79 1500 midget on the road,
Now though I'm stumped and actually need to ask a question as I can't find anything in the archives.

Our gearbox has been noisy for years, and as a stopgap I thought I'd change the engine oil - can't do any harm and might do some good.

I had expected to have battle with the filler plug, but I think I've found that without it being difficult to get to (about 2" up on the drivers side of the gearbox).

What I can't find is the drain, all the Haynes/MGOC and google pictures show it on the bottom of the gearbox, but there's nothing.

The only thing I can think is that the plug I think is the filler is the drain, but I can't really see that being the case

any help /advice much appreciated

t Kent

My 1977 1500 has a square plug right in the middle of the bottom of the gearbox.

I know Fords among others about that time got rid of gearbox drain plugs as the oil was supposed to last the lifetime of the car.

Maybe MG thought that too, late in the Midgets life, that is if yours is a very late one which being a 1979 model, it will be.
JB Anderson

Drain is on the bottom and the filler is on the side

mark 1500 on the road Preston Lancs

thanks - a picture tells a thousand words - so I've got a filler but no drain.

There is an hexagonal flat on the gearbox that looks as if that's where it would go - but it's never been drilled.

Be interested to hear if anyone else has had this problem and any solutions

t Kent

suggest you ask on a triumph forum they use more of these gearboxes so may have come accross this before
mark 1500 on the road Preston Lancs

I know that the very last 1500 Midgets had no drain plug on the diff, but I never knew about the gearbox.
Dave O'Neill 2

Just thinking out loud...

Could you not drill the casing, therefore draining the oil, then tap and plug it?
M Le Chevalier

just to close this out:-
There's no gearbox drain (but there is a drain on the diff).

I bought one of the syringe type oil remover things from Ebay for a fiver and managed to suck about 250ml of oil out through the filler.

Based on how much more I put back in (& BTW the syringe is great for that), I left about 200ml in the gearbox (so yes the gearbox was running about half full).

I'll run for a while then do the same again - if I can't do a full oil change, at least I can dilute out the old oil (I'm running about 25% old oil at the moment, one more change and it'll be down to 6%).

One outstanding thing, is there a list anywhere of Midget numbers - it would be interesting to see how late ours actually is
t Kent

Terry Horler's book 'Original Sprite & Midget' has a lot of useful information with regard to production dates, etc.
Dave O'Neill 2

my 1500 supposedly came from the last batch of 500 cars ever built (production date is 1978). BTW, it was originally painted black. It has a gearbox drain plug but no diff drain plug.
I'd follow Malcolm's advice. HTH
R W Bowers

There's a late 1500 for sale on ebay at the moment.

Here's a shot of the underside, showing the axle without drain plug.

Dave O'Neill 2

This thread was discussed between 15/09/2015 and 22/09/2015

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