crankshaft wabble

[listed]

my crankshaft pulley is wabbling up, down, and side to side. It has gotten progressively worse. It's not the pulley as the bolt head moves to the same extent. My first thought was either oil pump or the motor is burnt due to a bad main bearing. Does anyone know whether the pulley bolts directly to the crank or is there an intermediate shaft in the oil pump that the pulley bolts to. BTW bolt is tight for all those looking for obvious answers.

thanks,
Chris