"Capt John" wrote in message
...
On Mar 19, 7:12 am, "Eisboch" wrote:
Recently, I expressed interest in a 36' Hatteras that had been repowered
with Yanmar diesels.

I had some reservations after hearing that they were high RPM engines ....
(was told they ran at 3600 RPM at WOT) .... and I felt a little
uncomfortable with that, even though the engines had a good reputation.

I checked the engine specs on the Yanmar website and discovered that they
are actually rated for 3300 RPM at WOT.
That's still high as diesels go, but not that uncommon for a modern turbo
diesel built in 2006. The 1999 vintage Volvo's I had where rated at 2800
to 3000 RPM, depending on application.

I suspect that since this particular Hatteras was repowered, they may have
screwed up the pitch on the props. Adding a couple of inches to the pitch
would probably bring it within specs.

Doesn't matter though .... someone else jumped on the boat. It was a steal
at that price, given the recent upgrades.

Eisboch

I would leave the pitch right where it is. Our local Yanmar dealer
under pitches all the boats he repowers, they were not flexable at all
about doing this. When their that insistant, their's probably a
reason, like reduced life. Myself, I'd rather have Cats or Cummins. I
just see too many boats powered with Yanmars that smoke, with very low
hours. And owners suddenly getting rid of the boats (this was before
the bottom fell out of prices). Makes me more than a little worried
about them. The high RPM's are because those are short stroke engines.
You just can't get the piston moving as fast on a long stroke engine,
resulting in lower RPM's.

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Well, that makes me feel a little better about losing this potential buy.
Hope Tom doesn't have any serious problems! :-)

Eisboch