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Gearbox drain plug seized 200

M47 5-speed

The plug rounded off when I used a socket. So I ground it down a bit, hammered on an old smaller socket, and it rounded off again.
Tried grinding it to fit a smaller spanner - the spanner broke.
Ground it down further to get two good flats and applied a wrench. The stump snapped off flush with the casing.

The plug seems to be made of extremely hard steel, the most resistant to grinding of anything I have ever encountered. So it is not going to drill out easily, and certainly not in situ.

Is there another way to drain the oil, apart from syphoning with a tube through the filler plug hole, which would be unsatisfactory as leaving most of the debris which is the whole point of draining ?

I tried removing one of the lowest bolts holding the rear cover, hoping it might access the inside, but it doesn't. If I loosen all of the cover bolts, would the cover prise open enough to drain the oil?






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