Hey guys: I went thru some of this thinking I had a valve problem. I did
compressions tests and plugged the intake and exhausts and pressurized with
the valves open expecting to hear air coming up around the valve stems into
the rocker box area. Nope. Not until I drilled that little 1/4" hole, (I
was told by a "Grey Bearded A&P" to make it a 1/2" hole, but I chickened
out, then the oil smoking stopped. I'm sure that this phenomena doesn't
occur with a horizontally mounted engine.
S.Fields

"Gyroplanes" wrote in message
...
AD's and service bulletins for the R22 and looking for the valve
guide to valve stem clearance test to start with. I can't remember if
it was SB or AD
It's a service bulletin. Go to the Lycoming site and they will have it
there
for a free download, however, I don't think that's the problem. I seen
many
Lycs that didn't pass the wobble test and none of them smoked (just siezed
valves and bent pushrods).
You also need to buy an expensive tool to check the wobble.

I would crank the engine (after it has set at least overnight) as if you
were
going to start it, leave the mixture lean, then I would pull the plugs and
see
which cylinder is the offender by looking for oil fouled plugs.

If you have a worn valve guide you can usually see it. The excessive
clearance
between the stem and guide doesn't allow the valve to cool enough and it
generally cooks the oil around the spring and keepers on the exhaust
valve.
Don't compare intake to exhaust visually. The intake runs a whole bunch
cooler.
Compare cylinder to cylinder, exhaust to exhaust