Yz if you don't have any residual oil laying around at the bottom of the seal of if it doesn't look like there is any oil leaking through dont mess with it. But if you really feel it is necessary to change out get you a set of picks and a rubber mallet. You'll need to poke through the rubber of the seal ideally with a 90deg pick and pull it outwards towards you kind of work your way around the gasket poking in and pulling out until you fully remove the gasket from the crank. When you put the new gasket in make sure you square it up with the crank and GENTLY begin to tap it on the back of the crank. Make sure you don't hit and kink/break the spring on the ID of the seal otherwise it's junk. You will trade one leak for another. The seal should seat flush to the back of the casting in the rear of the block leaving what will look like a "lip" on the rear of your crank. That's when the seal is fully seated you might need to find something about 4" in dia. To tap on once the seal gets too deep to hit with your mallet. I might have some pictures from my motor build laying around if you decide to do this and you really need them.
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