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?

There are some replacement spring loaded tubes that do a better job.
I'll have to dig up the info on them...

What gaskets did they use on the rocker covers? We had the good silicone
ones, but they needed to be replaced from over tightening, replaced the
covers as you did as well. Make sure the dipstick isn't leaking and how
much oil are you carrying? Its best kept under or at 7 quarts, if you're
keeping it topped off, that can make for a dirty cowling...

http://www.napanet.net/~arbeau/swift/cyl.htm
http://www.napanet.net/~arbeau/swift/o3006.htm