[jfreddie]

I'm replacing the rear main neoprene oil seal on a standard A crank with the oil slinger machined down.
The seal doesn't fit snuggly in the groove at the back of the block.
The instructions say to use sealer sparingly.
What is the best sealer to use and how much?
I don't want to plug the drain.
Is there a better seal to use instead of the neoprene donut?
Thanks.