Try to put it on like a new bearing, using a socket large enough to fit over the crankshaft, and deep enough to go all the way down. Then supporting the crankshaft with a piece of wood in the rear openingto prevent it from being pushed out the back. It is very important that the load is put on the back of the crankshaft and not the crankcase. Another way that someone might say is to heat up the thrust washer since it's aluminum, and tap it on carefully before it cools. Just like iserting the new bearings.