"TIm Gilbert" wrote in message
...
Just flew to breakfast this morning and the vibration was there for about
the first 10 minutes and then went away. After we ate, it was there again
for the first 5 minutes of flight and then kind of disappeared. I also
noticed strange things on the EGT. I'm now thinking it's a sticky value
on
the number 4 cylinder (that's where the EGT probe is).

Can I just remove the valve covers and pull the prop through to check?

Tim

If it's sticking on the ground you can see it stuck with the valve cover
off. You can hear it too, i. e., blowby gases. We found an exhaust valve
stuck open by doing a differential compression test.

Read the material on stuck valves at Sacramento Sky Ranch's website. Very
informative.