Dear Oily Ones: I think my Alon's breather is nominally what the factory installed. A combination of aluminum tubes and rubber hoses goes uphill past the rear of the engine, then exits through the lower cowl. I would like to know whether anyone with an Alon (C90) knows how far the tube should protrude below the cowl - the Service Manual doesn't say - my breather protrudes about six inches, which is unusually long.
There is a Service Bulletin which describes how the end of the tube should be cut at an angle plus an oval hole cut on the opposite side to eliminate icing, but it also says nothing about length. I had a Beryl-D'Shannon separator on a previous aircraft, but doubt it is small enough to fit an Alon. My 35 hour old C90 uses approximately 1 quart per 8 hours, but it seems to burn rather than end up on the belly. Continentals have a reputation for using more oil than Lyc's. Read the Engine Manual and you'll be surprised how much oil usage is considered OK. David [EMAIL PROTECTED] wrote: >JBrim, >My Alon has a plastic tube running straight out the bottom of the engine >cowling and ends just above the back of the front tire. It is clamped to the >strut--or maybe to the ground wire on the strut, I forget. It gets most of >the oil below the belly when I fly. I have seen others that did not have the >tube extended as far out of the belly of the cowling, and even that seems to >help. I don't think it is necessary to go clear to the back of the plane. > >Ken Doyle >Springfield, Mo >N5477E > > Hi all, I have a 1965 Alon Aircoupe. I'm getting tired of cleaning oil from its belly. (Although its oil usage is within the normal range, the small amount of oil vapor vented through the crankcase breather ends up on the belly.) A friend suggested I extend the oil breather tube through the fuselage and out the tail to eliminate this problem. He says this is a common solution to a common problem and is harmless. Does anyone have any experience with this or opinions on its advisability. Another friend suggested an add on air-oil separator. Anyone have any knowledge of such a product suitable for a coupe? Is there an STC for such a modification? Thanks for any input. John Brim A
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