It is always discomforting when you know, and actually feel, that something is not quite right. For a little while now, while navigating under power, I felt some “new” vibrations that simply did not feel right. Putting the boat safely on autopilot, I went down into the cabin, opened up the rear engine cowl and realized it was the propeller shaft that seemed to be the origin of the vibration. It was either caused by poor shaft alignment which turned out not to be the case—or something else was causing this issue.
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