Doug I know you have the 55hp JH Yanmar.
Does it have the manual Kansaki gear?
Or one more robust than the lower hp 3cyl engines?
As per my post #6 I had terrible gear noise. I was embarrassed to come into port. It was quiet until it warmed up. Hence the solution (for me) was the cooler and much higher viscosity. Gear noise be gone!
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Eric
North Western Washington State USA
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