Hornet2008
Well Known Member
Have been looking at this and thinking it should be screwed down and split pinned. It is aft of #3 piston. Am I right to do this or is it a redundant part?
Isn't that your oil pressure adjustment?
I didn't sleep in a Holiday Inn last night (for the first time in ten days....), but I DID just get home from Lycoming school!
That is perfectly normal the way it is - if you have to adjust oil pressure (you probably won't), then you'd put a wrench on that nutm which is split-pinned to the shaft, and turn it.
Interesting fact - assuming a good pressure gauge that doesn't drift, Lycoming says that the cruise oil pressure in a particular engine shouldn't vary more than 1 psi between new and TBO - if it does, something has plugged or broken, and should be investigated.
I don't have an adjustable version on mine, but I am curious what keeps the threaded adjustment bolt from backing out? I would assume that a jam nut would be required to keep it from backing out over time.
Larry
That is perfectly normal the way it is - if you have to adjust oil pressure (you probably won't), then you'd put a wrench on that nutm which is split-pinned to the shaft, and turn it.
Aerosport claims normal and add a washer per 5 psi.
My oil pressure drifted down kinda low, so I tightened the adjuster nut a few turns, and it was good. Then a few weeks later, the oil pressure was low again. So I tightened the nut some more. This cycle went on for over a month. Then when I tightened the adjuster the last time, I safety-wired it. Haven't had to touch it since.
In my case at least, there was not enough friction on the adjuster nut to keep it from backing out again after I tightened it. I had never seen one safety-wired, but it sure solved the problem for me.
I've had a dozen different "airport guys" tell me that I need to tighten that nut down and safety wire it. None seem at all convinced when I tell them that it is correct as is, and typically walk off shaking their heads at the folly of it all.
Andy
A good friend of mine is in Fredericksburg picking up a new to me RV-3B and noticed pretty low oil pressure of 47lbs on the cruise over. Around 200 hours on a rebuild from lycon. But engine was pickeled for a long time. Will be looking at the pressure relief valve being stuck tomorrow morning but if he needs to dig deeper any recommendations of a A&P at Fredericksburg ?
A good friend of mine is in Fredericksburg picking up a new to me RV-3B and noticed pretty low oil pressure of 47lbs on the cruise over. Around 200 hours on a rebuild from lycon. But engine was pickeled for a long time. Will be looking at the pressure relief valve being stuck tomorrow morning but if he needs to dig deeper any recommendations of a A&P at Fredericksburg ?