Well, my brand newly rebuilt 89 2.1 has developed a mysterious oil leak at the rear cross member.
I have looked at it closely to try to determine where it is coming from.
The oil seems to drip down between the cross member and the aluminum casting that is bolted to the rear of the case.
I am thinking the  oil pump may be leaking for some reason?.
I used a new pump, gaskets, and red sealing nuts and its properly torqued.
I also used aviation permatex on both sides of the gasket behind the oil pump and the between the cover and pump.

Any other places it could be?

Dip stick is not leaking,
Oil filler tube is not leaking.

Cant really see directly under the pulley but the back of the pulley is dry, I used a new seal

There seems to be a fair amount leaking
10 mins on the freeway will produce several droplets all along the bottom of the cross member and aluminum casting.

Thoughts?
common culprits?

I have built several hundred air cooled engines and never had a leak here.

Thanks,

Doug