[Jim Sims]

There is not an o-ring in the rear main or flywheel end crankshaft seal; there is a "garter" spring inside the seal that may look like an o-ring. The new seal will also have such a "garter" spring; don't pull it out. The purpose of the spring is to load the inside sealing lip of the seal against the rotating land of the crankshaft thereby ensuring a good dynamic sealing action. The factory tool is very helpful in installing the seal correctly but careful work with a piece of wood and a soft face hammer can also do the job. Ensure the bore for the seal in the engine case is clean and also the crankshaft end, apply Curil-T compound to the outside of the seal and engine oil to the inside lip and carefully and evenly tap the seal into place (seal concave side toward the engine). Don't get it cocked and don't overdrive it; simply install it flush to the face of the case. Good luck, Jim