Snannon, if this is happening, you quite likely have something flogged out in the engine side clutch half. There are 2 types of clutch half - those with a single bolt and key, and those with a couple of set screws.
If its moving in and out, then there is play. I have seen so many motors with flogged out crankshaft keyways that I would suggest you remove the motor (or disassemble the clutch) to have a good look for issues. The clutch half will likely have an oversize (flogged out) hole.