The plug is in the diesel bellhousing at 2 o'clock.  It's plastic and is threaded.
The "mark" which may be for TDC, depending on the flywheel, is between the two
raised square bosses.  Check it with the distributor rotor and the mark on the dist.
rim.

Dana

> I have a inlne-4 in my syncro in the diesel configuration (51 degrees).
> Where is the TDC mark on the flywheel and is there an access-hole in the
> tranny somewhere that i can view it?? I've been led to believe i can see
> it through a plug in my tranny, but don't recall such a thing. Is there a
> plug in the block instead? hmmmm.
> thanks
> matthew