On Nov 12, 12:59*pm, Martin Baxter wrote:
Capt John wrote: Using more restrictive filters can
cause problems with your supply pump, or, even worse, cause the engine
to run lean. That will cause the engine to run hot and, over the long
run, cause all kinds of other problems.

Huh? Diesels do not run "lean". *Hint, think about you control
power/speed in a diesel.

Cheers
Martin

Wrong, wrong, wrong. You can run a diesel lean, when you have a
restricted fuel system, like your filters are clogged, it's starving
for fuel. Dead give away, the exhaust temperature starts to rise. If
you've got pyromiters you can see it right away. I've got Cats in my
boat, I don't need to look at the fliters to tell their clogging, the
engine temperature starts to rise. Change out the filters, and it
drops back to normal.

On Fri, 14 Nov 2008 09:19:59 -0800 (PST), Capt John
wrote:

rong, wrong, wrong. You can run a diesel lean, when you have a
restricted fuel system

Lean or rich describes fuel air mixtures, and Diesels don't even have
them.
Even so, lean lowers the temp.So does rich. Airplanes have a mixture
control and if you have an EGT gauge, it is easy to see it in action.
Lower temperatures on both the rich and lean sides of a peak. Lean,
you have less fuel heating the same ammount of air. This raises the
temperature how? It doesn't.

Casady