Ah, ok ... the optispark's drive shaft should have a notch cut in it for the o-rings. I just finished putting mine together, and it had 2 o-rings on the shaft (mine is a vented unit).

Since yours in unvented, I'm not sure if it has 1 or 2 o-rings on the shaft. Inspect the opti shaft closely (or take a pic if you can) and see if there is one or two notches in it for o-rings.

There are also o-rings which go on the waterpump shaft; so make sure you replace those as well. They are the same size as the opti spark o-rings.

Thomas.

 

There's a huge difference in the early and late opti seals in the timing covers..
I assume that you have an unvented 94 opti so the seal p/n that I gave for the 93-4 is the one you need.. the 95-7 seal is a LOT larger in diameter and no it won't fit a 93-4..
If Cromer gave you:12552428 it's the seal for the late vented opti, and no way will that fit in the early [unvented] cover..
Have you[or someone] upgraded the opti to vented?
The first shoebox diagram http://shbox.com/1/engine_front_diagram.jpg in Stoopalini's post shows the difference in the early and later timing covers at the bottom right..

 

Ya for some reason the part numbers were different but they were still the same size weird huh. i just need to know if there are any o rings used on the non vented optisparks

 

No o'rings