wrote:
I don't know what to do about this . . . hoping the collective wisdom
here might have some ideas. For the last 3 months or so, after every
flight, there are small streaks of oil on the inside of the lower
cowling on my 67 'Hawk . . . if I don't wipe them up, they drip down on
the tire of my nose gear. My mechanics have replaced all 6 rocker box
covers and gaskets, and re-flared the push rod tubes. I have spent
almost $1000.00 so far and it's still leaking. It holds pressure just
fine . . . my mechanics are now suggesting replacing all the push rod
tubes, but I get the feeling they are just guessing.
Any ideas?

www.Rosspilot.com

After our overhaul and complete cylinder replacement we had a tiny dent
in one of the crush gaskets on the screw-on oil filter adapter that
produced a small leak. Replaced the gasket and have had a squeaky clean
O-300D since. Knock on wood!