need help finding source of oil leak

[joegonzo]

I have a substantial oil leak around main crank shaft pulley.
my car is a 1975 911s, with a 2.7 engine with 113k miles
the leak is getting the fan/shroud wet (when engine is running)and dripping down the shroud and dripping on the crank shaft behind the fan pulley. the problem just showed up a couple of days ago.
It seems to have started when i had the car idling with the deck lid open in the drive way when a gust of wind blew a plastic bag into the fan belt I stopped the engine and removed all the visible signs of the plastic and put the car back in the garage the next day i started it up and let it idle again, when i noticed a pool of oil forming on the garage floor i turned it off and removed the fan belt and found a wad of plastic wrapped around the alternator shaft. is it possible that the wad of plastic put pressure on the belt and thus the crank shaft pulley which in turn ruined the main crank shaft oil seal? If so how can i fix it . i removed fan/shroud/alternator and can't find source of leak. I want to run engine with out fan/alternator for about 90 seconds to find leak can i do this with out causing more damage
any ideas will be appreciated
http://forums.pelicanparts.com/uploads20/porsche11340679260.jpg[/img]

[dipso]

You can run it without the fan/alternator.

Nice looking car.