AJS-20 oilspreed...

[morris]

Old problem, still on!
Oil from the mainbearing on left side pass bye the Spacer (Collar) o14295 inside the engine sprocket,
and fill up the chaincase, more or less.
Not! It is not from the crankcasebreather in the mainshaftend! Because it is permanent plugged, and a new breathport is at the opposite side, in timingsidecover.
A modern (!) hi-cap oilpump is fitted, and thereby higher pressure and more oil. Well, it gives plus and minus...
The parts in duty is in god order, but obviosly, they
leak under pressure, sorry.
The question: Is it any solution, for instance bye an O-ring or another arborsealing known?