If you can get to the timing cover, you can clean around it very well with MEK, must be oil free, and then smear on some silicone sealer with your hand.I recommend that you ware disposable rubber gloves.I have done this in the past and it is only a temparay fix.If it is leaing around the crank shaft you are out of luck.:
FORDS WILL STILL BE RUNNING WHEN ALL THE GENERAL MOTORS JUNK IS ON THE SCRAP HEAP!