The key is not a full length key either, it's just a small square finger on one end of the inner bore of the gear.
If the gear rotated on the crankshaft it could be jammed on there. Most like thing is the crank turned a little and the gear did not. If you can rotate the gear back to the slot location it might pull back off easily.
The engine turns clockwise when seen from the front. Chances are the gear is a little bit counter-clockwise from where it belongs. You may be able to get a pipe wrench around it and give it a turn back to where it needs to be.
Then you can get it off, and install the new one. With any luck a junkyard might sell you one for $5 or $10... otherwise you'll be buying one from a new parts place ($$$) or maybe someone here can find you the right one. (93-up have different timing belt teeth style.)
Good luck!
--Rob
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~ 92 244 M47 modified ~ 89 244GLT Turbo Conversion ~ 90 745T Auto ~ And a VW Bus~
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