rear engine oil breather

[sunnysky]

Ive just noticed oil from the rear breather which is going onto the prop.
this has just happen quickly.
I keep the oil level at 6 quarts so dont think its overfilled.
any ideas on where to start ?
1977 337 G normally aspirated. around 800 hours on engine.
engine runs perfectly normally with no other "leaks"

[Learjetter]

A little oil, or a lot? Did you notice a much greater oil consumption versus normal?

Are you certain it’s not the prop grease or oil leaking?

Do you have an air/oil separator installed?

Last compression check ok? Power-stroke combustion gasses might slip past sticky rings and slightly, temporarily, pressurize crankcase and push oil/foam out the breather.

If you think it might be stuck or sludged rings, download the piston-ring flush technique free from the savvy aviation website.
https://resources.savvyaviation.com/...vent-flush.pdf

Keep us posted, please!

[hharney]

Are you new to the plane? That’s pretty normal for Skymaster

[ljmolina]

Yep, thats pretty normal...Mine stays pretty level at about 7-7.5 qts

[Jhogan0101]

How do you know its from the oil breather tube?

[Burt]

I had the same problem but it did not start suddenly but developed over time. Pulled the cowls and found the rocker cover gaskets and push rod tubes were dripping a small amount of oil and it does not take much oil to look bad on the prop and horizontal stabilizer. Fixed those leaks by tightening the screws on the rocker covers and rotating the push rod tubes. Problem solved for now. Eventually will probably have to replace the rocker cover gaskets and push rod tube seals.