164 Oil leak by distributor

["Eug. Christodoulou" <e-a-c@domain.elided>]

An annoying oil leak has developed where the distributor mounds to the head.
I removed the distributor cup and there is no oil leaking inside so
the leak is on the outside. Can anyone tell me how involved is the repair of
this. I am assuming an oil ring has gone bad, but how do I get to it.
I hope I do not have to remove the cam.
Thanks
Eug. Christodoulou
91 164L
MN
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