Quote:
Originally Posted by TnCreekMaster
It's the prop that moves slightly back and forth...
|
Possible spun hub, swap props with buddy and give it a go.
Spun hubs whirl and produce strange vibrations; additionally the rpm will jump around when torque increases with higher RPM's as the propeller and hub are no longer in synchronization. Top speed will be lacking, this phenomena only occurs at full torque/RPM. Side loading/turning increases the lateral force on the prop/hub and often lessens the slip, thus sound-vibrato is absent. The durometer of the rubber hubs, in time will break down, especially if the prop has struck an object known or otherwise.
What prop-pitch/hub-design/engine-manufacturer is in question so someone may lend you a prop for a test run if you don't have a spare?
In any situation, a full inspection is in order, if you have shaft play proper further inspection is required. It is not unusual to pick up foreign material(fishing line, rope, etc) and it wrap on the output shaft. If you pull the lower unit make sure to replace the water pump with a comprehensive new kit not just the impeller...a new housing is often necessary.