Doug,
I, too, have a similar problem on my '91 Carat Automatic.  Hopefully, there's some wisdom on the list to let us both know where the problem may be....
    -Robert
-----Original Message-----
From: Doug in Calif <vanagon@ASTOUND.NET>
To: vanagon@GERRY.VANAGON.COM
Sent: Mon, 31 May 2004 11:12:51 -0700
Subject: Mystery oil leak on 2.1 please help with ideas

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