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posted to rec.boats
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Came across a genuinely bristol older boat........
wrote:
"Free & Clear's" twin 300-HP Yanmar diesels were installed
in 2000 and can now be considered "broken in" with only 775 hours
They are way more than broken in, more accurately, half used up or
possibly more. We are not talking about 3,000 lb cast iron engines
that are built to last forever. The Yanmars are lightweights that will
be lucky to make it much past 1,500 hours without major overhauls. The
fuel tanks, hull, deck and hull/deck joint should also be regarded as
highly suspect in a high usage boat of that age.
Sounds like you've been reading David Pascoe's website. He places the
life expectancy of most diesel engines somewhere near 1,000 hours,
IIRC. We need to get the word out to thousands of people well beyond
1500 hours on their Yanmars that they are overdue for a major overhaul.
I do agree that these engines are unlikely to ever see the 5000 or 6000
hours often achieved with older, lower RPM engines like a Ford Lehman,
my original Perkins (that died only due to a manifold failure around
4000 hours), etc. But to predict they won't even survive as long as a
well maintained marinized automobile gas engine is far too negative,
IMO. Did you know that Yanmar scored better than Volvo, Perkins, and
some other top names in a survey of actual diesel engine owners in the
Jan 2006 issue of Cruising World?
A thorough survey would confirm or defuse concerns about the hull,
deck, etc. and nobody should ever buy a used boat without a survey.
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