You'll find the timing inspection hole just slightly above and to the left of the starter (as you look within the engine compartment on the driver's side of the car, back toward the rear of the car).

You can make this process easier by unscrewing and removing the cap on the back of the solenoid, which covers the remote starter button. You can then press the button and watch the flywheel rotate. The stars are stamped into the flywheel so you may have to carefully wipe off the grease with a kerosene soaked rag.

When one of the two hex plugs rotates into view stop the flywheel. You just need a regular socket wrench (I forget the size). After you've loosened the plug carefully remove it with your fingers and try not to drop it down into the flywheel cover below. (If you do, you'll simply have to go under the car and remove two bolts to retrieve your plug.)

Then rotate the wheel until the next star shows up in the hole, and at this point the fill hole (now open, because you removed the plug) will deposit the liquid contents of the clutch onto your garage floor - you might want to have a pan ready to catch the 8oz of old Hudsonite that will drain out.

When it's emptied, rotate the hole back so it's visible through the opening. You do not need anything too special here, maybe a small funnel with a rubber tube thin enough to fit through the hole, into which you pour the Hudsonite. Or use a baby's enema syringe. Put in just the one bottle of Hudsonite. Then cap the hole and you're done!

 

Instructions from 'Jon B', as copied from a thread on the HET Forum.