Wilbo,
I have just recently removed two gearboxes from behind both of my 2Ts and the same thing.
The rear main oil seal and the input shaft seal are designed to stop anything getting in more than out. The way the lip makes contact. BTW same for most oils seals on a car.
Under most circumstances some quanties of oil/fluids come out and over enough time build up to become noticable.
Had me puzzeled all the time but from what I am now thinking. The substance (grease as you call it and what it looks like on mine) could well be oil and clutch friction material. It could also contain water and dust which get in through all those spaces and rubber gromets.
The source friction material is of which is of course the clutch plate and it gets on the flywheel and spins onto the inside of the bell housing.
I think this cannot be avoided and gets messier the more you run the engine and gearbox and I cannot think of any way to stop this from occuring.
My thoughts. Maybe someone can confirm or refute them and help both of us understand where this "mess" comes from.
Regards
Rodger
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