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By T67M
#1692847
Oil pressure relief valve could be stuck or simply need adjusting. Worth getting fixed, but probably not overly complex unless it's a symptom of something else - eg the valve is stuck due to metal in the oil.
#1692924
Some numbers and background info might help.

What pressure are you seeing now ?
What is 'normal' Oil pressure/temperature for that engine?
Engine type?
Has anything been done ( changed) recently?

Even an apparently insignificant a thing such as a like for like oil change will produce higher pressure on our IO-360 compared with oil that is about due for a change.
#1692946
Charliesixtysix wrote:Some numbers and background info might help.

What pressure are you seeing now ?
What is 'normal' Oil pressure/temperature for that engine?
Engine type?
Has anything been done ( changed) recently?

Even an apparently insignificant a thing such as a like for like oil change will produce higher pressure on our IO-360 compared with oil that is about due for a change.


a) pressure at the top of green/bottom of red at anything other than idle power (estimate 90 PSI)
temperature 190 ish

b) pressure normally sits 3/4 up the green (75PSI)
temp normally 190

c) Lycoming O-360
nothing changed
previous 2 legs behaved normally

just noticed the pressure slowly creeping up in the cruise at constant RPM (2450 rpm)

editted to correct gauge readings
#1693063
Temporarily plumbing a known good mechanical guage into a spare oil port would double check your cockpit readings (and might point to a faulty sender).


If you do find high pressure on test gauge first port of call for peace of mind for me would be to change the filter and cut the old one for inspection.
Assuming all OK, it would be worth looking at ( as perviously mentioned) at relief valve function.
Nick, mmcp42 liked this