what was strange was that I noticed oil
coming out of my key way on my prop shaft. Running engine
was leaking on rear seal. so what I did was disconnect the transmission coupling, and moved the prop shaft aft, then you can see the nut that holds the coupling to the transmission. the the nut had backed off and the o ring was cut, Note nut is a l/h thread. and is a 30mm, part number of the O ring is 24311 000210
not sure what kind of stuffing box is on your shaft.
if you have to replace the rear seal there is a good video on doing it,
I have a ipc showing parts
, if you should need it, e-mail me