G'day Glenn,
ET164 is a pressed tin affair. A washer with a spigot on it or a spigot with a flange on it how ever you want to call it. Not sure that it does too much other than present a flat face up against the the oil slinger. I Araldited mine in about 31 years ago and it has been there getting a free ride around the country ever since. As for PD 32, I have never ever seen one. Its a real belts and braces affair in there but there is room literally for a sealing arrangement that does seal. I had a Lucas E3L with a sealed drive end bearing on the Norvin for most of the past. That fixed oil getting into the generator. Between the generator and the back of the PD I machined up a 1/8th thick walled tube about 1/2" long. This pressed onto the shallow spigot on the Lucas generator. I then cut a 1/8" thick neoprene cork penny washer that is sandwiched between the tube and the back of the PD. Liberally coat in silastic and push the generator hard over against the back of the PD. This seals it up.
Now it has been a very long time since I have seen a Miller generator but I seem to remember that the Miller has a rounded projection, housing the bearing. Could a similar thick walled tube be machined up to be sandwiched between the the generator and the PD? Perhaps then some sort of seal could be run in this tube to keep the oil out of the generator?
I am surprised the the generator bearing cost so much. I think it is the same size as the Lucas bearing and they came as a sealed bearing and certain didn't cost that much. Something in the order of 5 to 10 dollars.
Phelps.