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Permalink Reply by James McFarland on June 30, 2018 at 11:39am

This is an excerpt from the webpage "Early Cessna 150 Inspections, Tips, Tricks, and Hints"

"For those of you tired of oil on the belly and don't want to go to the hassle and expense of installing an oil/air separator (such as the M20 unit), you could install an aerobatic breather elbow that was used in Cessna 150 Aerobats. Its is a standard brass elbow milled out to accept a steel tube which is then silver soldered into the elbow. The Continental part number for the aerobatic elbow is 633182 and the part number for the standard elbow is AN842-10 which is a standard part.

Beware that several years ago someone manufactured a number of bogus aerobatic elbows and you should obtain a known legal part, either removed from an aerobat engine or new from a Continental parts distributor."

James Mc.

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Permalink Reply by christopher fryatt on July 1, 2018 at 7:39am

I have a separator and the aerobatic elbow ( now standard part) still find stuff in can, information ive heard relates to making sure no fluid goes back in system.

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Permalink Reply by Glenn Johnson on July 3, 2018 at 8:29pm

I started out without a separator and had oil all over the bottom of the plane.  After I had to rebuild I added a separator and what a difference.  I have a good 80 hours on it and no oil anywhere.   I also use less oil.  Use to add a half quart every couple of flights and now I go 5 to 10 flights without adding. I also let it drain back into oil sump.  After research I made sure the vent hose was well insulated so it does not cool down.  

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