There are two reasons you get a leak here:
1. The rubber seal that's pressed into the timing cover has worn. This part
is pressed into the timing cover *from the back side*, so you can't replace
it without pulling the timing cover, and all that entails. While you're
in there, you might want to change the tensioner - they're cheap, so
you might as well have one on hand just in case.
2. The ragged edge of old seals, and the dirt trapped by them, has
worn a groove in the crank. If this is the case, a new seal won't
solve your problem, because the surface it's trying to seal against
is gone. The rule of thumb here is that if you can catch a fingernal
against the groove, it's too deep. This is when you need a
speedi-sleeve, to renew the sealing surface - along with a new
rubber seal in the timing cover.
Speedi-sleeves are a pretty tight fit by design. I prefer to use
a small arbor press to install them, though I've certainly done
it more than once with a hammer. You may find that you'll want
to pull the radiator to give you enough working room (sorry).
See
http://www.chicago-rawhide.com/auto/speedi/speedi.htm
for an overview of installing a SS. (Useful for wheel spindles,
diff pinions, and a host of other applications :-)
Pulling the timing cover isn't that bad, really.
Good luck,
chris
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