Maintenance Matters

September 2000 Issue

Air/Oil Separator

Owners rave about dramatically cleaner bellys but we found the results mixed.

[IMGCAP(1)] If there’s another job as thankless as degreasing the belly of an airplane, it doesn’t come immediately to mind.

Some of that grunge finds its way onto the belly via engine oil leaks—major and minor—and the rest spews out of the crankcase breather line and the exhaust pipe. The breather, of course, is the culprit.

Over the years, various devices to staunch the flow of oil mist have been tried. These so-called air/oil separators purport to scavenge the oil vapor and dump it back in the crankcase instead of overboard, where it condenses on the belly.

The latest of these gadgets comes from M-20 Oil Separators, the same company that developed a turbo-normalizing system for...

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