I just went to stick my box on to the engine and went to trial fit the gasket on to the gear box.

Should the gasket allow clearance so the o-ring can be fitted mine dosn't of course.

or do you fit teh o-ring and then the gasket on top

Ta

Kiwiinwgtn

Fit the O-ring first then the gasket.
I do them upside down, with the gaskets on the block- it's easier to drop the box onto the motor than vice versa. And less chance the 1/2 moon front seal will get dislodged.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

so the gasket dosn't sit flat then ..due to it sitting on the o-ring

True. It does though, when the bolts are tightened.
I stick a smear of HMP grease in the hole for the O-ring to hold it in place so it doesn't fall out.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

some of those half moon seals can be a pain, the orange ones fit better but are harder to locate, the black ones seem to fit better but when everythings bolted together they never locate properley.

and dont lose the o ring, youll lose oil pressure which is bad.

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Aussie Leyland, Aussie Factory, Aussie Mini S.