Engine failure – mixing elbow

Hello all, we are new to the board and would like to share an experience from last week on the Pamlico sound in NC.  We were motor sailing and suddenly the engine reduced rpm’s and then quit.  It would not restart, did all the fuel things, filter(s) and the like with no luck.  After a day and a half at the boatyard we learned that the exhaust mixing elbow was totally occluded from carbon.  The Yanmar Service tech told us “it’s a 5 year service item”.  We have a Yanmar 3jh3e with 2700 hours on it, and we have owned this boat for 2 years.

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Next I would like some info on our 02 380, # 0365.  Our motoring speed @ 2800 rpm is 5 to 5.5 kts.  We are to haul soon and would like to check and may be just replace the prop.  What I have seen on

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