I would degrease the area to clean it up so you can confirm it's the crank seal, if it is you will need to remove the pulley from the bottom of the engine and the seal will be in the block. You can remove the seal by making a hole in it with a small drill bit and then threading a screw into the hole, this will give you something to grab on to so you can pull the seal out. To put the new seal in get a piece of pvc pipe that's the same diameter as the seal and longer than the crank, this will let you tap it in with a hammer. Pay attention to how far in the old seal is before you remove it.
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