I have found that my seal is starting to leak less and less. I believe the physics going on here is that when the seals are new they have a very sharp sealing edge. When they begin to wear slightly, that edge rounds off a bit and makes a better seal. I talked to a local Porsche mechanic lately and he has confirmed this. Just a little bit of patience is required.

Norm - since I install the seal after the engine is together, it has never ocurred to me to install it that deep.

The issue would be installing it so deep that it rubs on the thrust flange of the crank. If it sticks out too far, the flywheel will rub it. Should work OK in between those extremes. If you have a score, I suppose you could adjust its position to miss that.

At least you don't have to pull the case apart to remove it and put in a new one.

Walt

Two other things to consider. An out of balance flywheel will make it leak and have you checked the oil galley plug uner the flywheel? Though it doesn't seem likely that's the culprit in this case.

I was trying to update this thread with some new empirical evidence. It does seem that, in the case of my seal at least, that it has almost stopped leaking compared to the way it leaked when first installed. I have recently talked with other mechanics who have observed the same thing. In my case a little patience was in order (Only about 5K miles). In other cases there may be issues with crankshaft play, balance, grooves etc. that need to be addressed. My point is that don't change the seal multiple times unless you are sure what is causing the problem.