Play
Of course a good idea to tighten all nuts (loosen and tighten again at the correct torque), in the process check the keys, especially the one on the balancer shaft.
Then, as for play: the main crankshaft bearings on the XT are "C" class, meaning that they have a relatively large play when cold - at warm engine this play disappears.
My advice is to either live with the noise, or find another cause - I never heard of failing main crankshaft bearings in the XT.
In case it is main bearings, this would mean the noise should be synchronous with the combustion, and should INcrease with engine load.
Auke
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