Blow By Oil

[Dale Campbell]

Hi Mark,
I also have a 337H and live right next door in Penna., so our climate is the same. I also had the oil on belly and tail feathers.
It is now much cleaner after putting M20 air oil seperators on both engines. I have two suggestions that worked well. Mount the M20 as high as possible, right against the top cowling. This allows oil to flow back to crank case without trapping at a low spot in oil line and not working properly. I would also wrap the entire oil seperator and oil line with insulation, so in winter the heat stays in line to keep it flowing and water condinsation does not form. Thats what I did and it works just fine. The only other leak I had was valve cover gaskets, which I replaced and push rod valve seals, which I replaced. My bird is now much cleaner. Good luck and safe flying. Dale Campbell