Oil leak on my MX-3

Hi all. I can't find another newsgroup for Mazdas, therefore
I'll try my luck here.

I have a '94 Mazda MX-3 1.6 four-cylinder with engine oil seeping
from between the engine- and transmission casings which leads me
to suspect that the crankshaft bearing seal has perished.

Is it possible to replace the crankshaft bearing seal once the
transmission has been removed or will I have to split the crank-
case to achieve this?

Thanks in advance,

Bjoern