I have a 98 Tige 2200V with 350 MPI mercruiser in it. It has an irritating squeal under load. That is, at idle it is nice and quiet. When I hit the throttle I get what sounds like a belt squeal coming from the engine. I have not been able to isolate it.
I have changed belts several times. It has relatively new alternator (2 yrs old) New water pump (2 yrs old) and I change the impeller every season.
Any thoughts on it?