hey team

i have just purchased a brand new os tr r spec
awesome engine i bought it for backup as im already using one.

i thing i wanted to ask was why does the crankshaft move back and forth slightly ? meaning i can hold the engine by the crank case and pull the crank shaft back and forth a fraction. say about 1-2mm of movement

ive owned many engines and ive never seen this. i took off the engine backplate and all seams normal inside.

should this be ok ?

thanks
John