Pull out the transaxle, and then, the driveplate/
Flywheel should also be pulled out. Remove the Crankshaft Seal from the rear of the engine utilizing the seal removal tool or a head of screw driver mindfully not to cause any disappointment on the crankshaft or on the seal bore. Wipe out the mating face of the block by using a shop towel; make sure there isn't a single drop of oil or dirt on it. Apply grease on the OD of the seal and place it over the end of the crankshaft with the lip pointing towards the engine. Preferably that the seal installation tool be used to high the new seal into position and indicated that there is a requirement for a small oil drain in the separator to be positioned at the lowest level. If the proper tool is not with you, a large socket can be used to chisel and insert a new seal gently with an aim of getting it flush with the edges of the engine block. Lastly, fit back the driveplate or the flywheel then follow it by fitting the transaxle.