Ok on the shaft seal, will try that method. My big O ring looks more like a flat gasket which is why I thought the cast body had to seperate. More than likely the reason for my leaks!
I have noticed some of the large rings are a flat (square) ring, and some are round.
The round ones seem to seal easier, but you pretty much have to use what you get I guess.
Putting the tank back on I will sometimes use a vice just to gently squeeze it over the sealing ring.
This is where the thin film of RTV on the lip of the tank helps a lot.
Keeping the tank from popping back off is a bit of a 3 hander sometimes.:D
