The oil film, when all goes well, prevents actual metal to metal contact.
Just like the plain bearings on the crankshaft.


I had to have my engine (Lycoming O-235) overhauled last year at less than
1/2 TBO, partially for cam pitting. Prior to my owning it, it hadn't flown
too much for the past few years.

Now, I'm flying every 2 weeks, at least, if weather permits, and am using
Avblend. This additive is supposed to better impregnate the metal, and
prevent some of this corrosion.

I now have the plane in a hanger, instead of outside in the cold and added
moisture.


The few things I've heard about causing the problems a

Flying too infrequently, with oil seeping off the cam and moisture eating at
the exposed surfaces.

When flying happens, not getting the oil completely hot, so as to eliminate
the moisture from it.

Running the engine too slow at startup. Apparently, the cams in some
engines get lubrication mainly from the oil splashing around inside the
case. In some engines, 1000 RPM may not be sufficient for full lubrication
after startup. My A&P suggested 1100 - 1200 RPM.


I'm certainly hoping that the steps I'm taking will keep the engine in good
shape. I can't afford another overhaul anytime soon.

Paul Missman