i recently changed the water pump on my 91 SC. i had to remove the crank pulley in order to get the timing pointer shield off. well i get it all assembled and start it up to check for leaks, and i notice the crank pulley is wobbleing like crazy. i know i tightened everything down to spec. is there a allianment pin on the balancer or something. it just seems oddly strange that it would do that. any suggestions.? !