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.