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From: Philip J. Rosch (no email)
Date: Sun Dec 14 2003 - 13:54:22 EST
(SNIP) And who has this information? It's not in my manual. That said, an
oil cooler is only a copper tube cooled by water, isn't it? No mechanic
parts. So why change it if it does not leak? On which basis do you take a
decision?
Exactly! That's my point. It's not in manuals, but bolt on stuff causes
all kinds of failures which make engines die before their time. If you have
Lehmans and call Bob or Brian at American Diesel, they have a good handle on
the duty cycles. Elbows are 2000 hours, for example.
Re coolers, oil in the water isn't terminal, but water in the oil can be. I
change mine every 1500 hours. For $65 it's worth it to me not to risk
damaging a $7,000 engine. Every time your engine has to shut down on an
overheat, or low oil condition you are taking a risk. Blown head gaskets,
warped heads are side effects of marginal preventative maintenance IMHO.
Last year I replaced heat exchangers, oil & transmission coolers, fresh and
raw water (new style) pumps, and elbows because I was approaching 6,000
hours on my Lehmans. If you have a noisy water pump bearing on one engine,
and your hours are equal, you can be reasonable sure the water pump on the
other engine is at the end of its useful life.
I'm a single handed cruiser and I can't afford surprises. Your mileage may
vary...
Regards....
Phil Rosch
Old Harbor Consulting
M/V Curmudgeon MT-44TC
Currently moored in Miami Beach, FL
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