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Old 12-15-2016, 01:25 PM
Jim Booth Jim Booth is offline
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Found the cause?

So after we pulled the boat for the winter, I thought to look around and found the zinc was very loose on the prop shaft. I'm hoping this would explain the problem I described above. What do you think?

[YOUTUBE]https://www.youtube.com/watch?v=rJJR9y53u-g[/YOUTUBE]

It seems like a small mass to create as much noise and vibration as we experienced, but spinning as fast as it does, maybe so. I'm guessing it wouldn't necessarily cause vibration at the same speed as the prop since it's loose so maybe that explains the lower frequency of the noise/vibration relative to normal engine sounds.

Jim
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