No
You do not have to dismantle the engine for that (as in: not have to remove it from the frame and not have to take it apart) except for removing the right hand engine cover. It's even more practical to leave the engine in the frame as it gives you some leverage, the frame that is.
Indeed, crankshaft nuts I've never heard of, but I have seen a couple of engines where the balancer shaft nut has come loose.
While you are checking your fifth gear take a look how the balancer weight moves in between the crankshaft halves and then imagine what will happen if it became out of synchronisation with the crankshaft. Yes, ..... that's what I saw.
Good luck
Auke
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