I think your numbers are right on target. It's always
a bad idea to run engines, especially diesels, below
operating temps for extended periods. Crankcase
dilution is the major problem but gum and laquer
deposits are also bad news.
The specs for the 6-71TI's (on most 460's) are only
slightly different from the 6V-92's. The 71's operate
between 160 and 185, and the manual recommends
that if you need to idle for a long while (like waiting
for those damned bridges in Virginia), to keep it
In my case, I run at about 1350 rpm which yields
about 8.5 knots in slack current (any more than that
and she starts to squat, any less and she's too cool).
I'm pretty paranoid about what's going on in the
engine room so I do visual checks about every hour
or two. Those checks include temperature checks at
various points on the engine and transmission
utilizing an infrared gun. Generally, my coolant
temperature is about 165 at the thermostat and my
oil temp about 230 at the pan, both of which are in
line with the specs. Nevertheless, I still put the balls
to the wall about once a day to blow it all out and to
make sure that everything is working as it should.
I'm running about 200 hrs a year and do an oil
analysis annually to make sure there are no
developing problems. I'm showing 1400hrs now and
so far, everything is looking normal with no
perceptable dilution. I have thought about putting
smaller engines in when it comes time to repower but
then I would lose the ability to dodge a storm and
probably market value, too.
I'm also swapping out my analog oil pressure and
water temperature gauges for digitals (merry
christmas to me!) but I'll still do visual/manual checks.
I really do like to monitor those engines closely.
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