Gen 4 3300 low oil pressure with hot oil and low RPM
I have tried working with the US distributor but we seem to have run out of ideas.
My generation 4 Jabiru 3300 has about 92 hours on it. Recently it began showing low oil pressure when the oil is hot and the RPMs are low, about 8 psi below 1400 RPM.
we tried a different washer to retain the PRV, tried an additional washer under the spring, and I even cleaned up the PRV with valve lapping compound. No change.
cruise pressure is now only 34 psi - used to be over 40
Sorry to hear of your problems. The causes of this could be difficult to find. The best option is to contact us here via email - enginespares @ jabiru.net.au. And then we can go through the process of finding the problem.
I have sn 33A 2959. Is the cruise oil pressure 40 or 34 psi?
I have gen 4 engine too with 200 hours on it and the oil pressure has also dropped, changed oil pressure sender and exactly the same.
Oil pressure drops to 1 psi when hot and engine rpm reduced to idle.
Have added second washer under spring but this also did not help.
At 2850 rpm and 85 deg C oil temp I only have 25 psi oil pressure.
Maybe the oil pumps wear letting oil bypass instead of pumping?