I have a 97 Commander with a Dominator jet and im pretty inexperienced when it comes to jets. Im starting to hear a sort of whine comming from the pump area that gets louder with increased RPMs. I was wondering if there is a sure fire way of knowing that it is the thrust bearing before i go tearing the motor out. Also, what would have caused this to happen? the boat only has 150 hours on it and i do run the bilge but im not sure if i run it enough. Any help would be greatly appreciated.