dawgfreeman wrote:Im tired of the twice yearly belly cleaning, the 58 y/o shoulders cant take it anymore....anybody had any luck with the air/oil separators??? do they perform as advertised to keep the belly clean??
A bit of history; in calm air there has been very little or no discharge from the breather, in turbulence the breather would blow out some oil, in an effort to rectify this problem, I installed an Air Wolf oil air separator, against the advice from the tech writer at Sky Ranch and my IA. My IA is not in love with Air Wolf products, the tech writer at Sky Ranch says the combustion gasses and moisture condense in the separator and returned to the crank case create a corrosion issue, however I was convinced that the circulating air from the vacuum pump would purge these gasses from the crank case. Did I mention that I have a hard head?
I installed the Air Wolf, oil air separator, problems started as soon as I opened the box,
I ordered it from the factory web page, the order form was specific to make, model, and engine, both the STC and the order form reflected the make, model and engine, maybe one of the hoses were long enough, the scat hose was way too short, the vacuum pump line was way too short, and if I remember right I had to pay for the difference after returning the short lines to the factory, I could be mistaken on that point, I have tried to forget the whole ordeal. They said that I had ordered the wrong kit that was why the lines were the wrong length, really? (The separator, according to instructions, is mounted in the highest possible in the engine compartment, I don’t know of any aircraft that could use only a foot and a half of breather tube)
Now that I have installed it I made some short flights .5- 1 hours it seemed to work,
then a flight to Los Vegas,
1.45 hours, HOLLY S$#T oil everywhere, I’m surprised that Henderson didn’t bill me for the clean up! It has NEVER done this before!
In the instructions they explain that the scat (vent line) must be positioned in just the right spot to stop oil discharge from the breather. Fourteen hours of dicking with it and numerous calls to the factory they finally told me to remove the vacuum discharge line from the separator can and plug the hole, Hmm, this isn’t in the instructions, I also disassembled the separator I found that one of the legs of the floor in the separator was partially covering the oil return hole,
now, it finally seems to be working, there is still a small amount of oil vapor on the bottom but nothing wet, still need to clean it now and then, 150 hr or so later I had the return line valve cover off, I found rust on my valve springs and on my push rods.
After inspecting the separator it appears as if the discharge air from the vacuum pump was actually pressurizing the breather and forcing air and oil out of the oil drain, but that is only me theory. Good luck.