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Steve: The governor has its own oil pump to increase pressure to the hub. It relies on engine oil to feed it but not for governing pressure. I can cycle the Legacy prop even down at lower speeds by pulling the RPM knob--even 1000 rpm I can get a drop. You mention oil leakage, I think you're referring to the transfer ring? Those clearances are in the ten thousandths of an inch range and there's not going to be any leakage unless you have a problem. I read on avweb there are tests to show if the collar is leaking. The main issue is that engine oil pressure is not what is governing your prop. There may be other stuff going on. Props and governors are fun topics. I find them both very reliable and they've been around a long time.
I'm not so sure at idle power in flight one can pull the prop back(coarse) that much. Just try changing rpm's at low rpm's during run-up . I have to be at around 16-1800 to get the prop to cycle at run-up. Oil pressure play's a big part of the governor's ability to move the prop. While at idle power one may have high enough oil pressure but surly not enough volume as 1800 + RPM. There will be oil leakage around the front main bearing going to the prop. |
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