On Sun, 2 Mar 2008 06:48:44 -0500, "Eisboch" wrote:

The Volvo's that I had in the Navigator ran at about 2600 rpm at cruise and
2800 rpm at WOT and they seemed happy. 3600 rpm just sounds very high for
a diesel. It's something I'll definitely take note of should I decide to
pursue this boat.

3600 is very high, and the engine develops a lot of horsepower for its
weight and displacement, all indicators of high stress. A quick read
through the class action documents shows that Yanmar is requiring a
timing belt replacement every 1250 hours as routine maintenance. That
is very unusual in my experience, and may go the heart of the valve
failure issue.