Quick rule of thumb. If you can MOVE the crankshaft, especially fore-aft, there is a PROBLEM. The 3W uses ball bearings, which are sealed, and they are pressed onto the crankshaft. If you can mofe the crankshaft fore-aft, that means the shaft is either sliding on the inner race of the bearing (which it's NOT supposed to do. .press fit) or that the bearings are starting to go bad, allowingyou to move things around.

Things usually loosen up just a little bit when the engine is hot, and I've seen BME's that you could move the front of the crankshaft on, because of the bearing design. But, no 3W I have ever seen allows the crank to move in a noticeable way. The bearings are massive, beefy things on that motor, a true exercise in overkill, so there should be little if any perceptible play in the crankshat.

Best bet is to contact your supplier and ship it in for a good going over.