After arriving in
Finland with 3/4 tank of
fuel, due to a thousand miles of wonderful sailing and almost no motoring, we are now burning it up motoring against the
wind through the inshore fairways.
We noticed that the
oil pressure suddenly went up from 3.8 to 4.3 -- while motoring steadily at 2100
RPM.
Why would it do that? Both figures are in the normal range, but it seems weird.
My 4JH3HTE has a lube oil-to-sea
water heat exchanger -- which along with all the other heat exchangers I had professionally cleaned last year. Maybe there's a thermostat in the that circuit? Which opened when the
oil got to a certain temperature, which cooled it back down again (depending on hysteresis of course of the thermostat), bumping up the pressure?
Or what else could have caused this? Seems weird.