1st time boat owner, purchased an 85 bayliner trophy bass boat. The Propeller was not installed on the shaft as it was in storage and started in a plastic tote. Motor fired right up but I didn't think of ensuring prop turned freely. I have installled the prop and is very hard to turn and makes a slight clunking sound which I would assume is not a good sign. I tried turning while in all gears and no luck on turning freely. Anybody have any idea what could be wrong?