Everyone probably knew this out there but me; but just wanted to pass along my experience just the same in hopes of saving someone else some downtime and $. I was retiming my left magneto on my RV-3A (O-290G) and I didn't realize the gasket under the outer adjusting "slot" had torn away. After "stabbing" the mag and adjusting it I put on the nuts and went to torque it to spec and I heard a breaking sound, almost like china cracking. After backing off the nut I realized the outer part of the magneto had cracked, but it wasn't until I pulled it to take it in and have it swapped out for another serviceable body that I realized the gasket was gone. $155 mistake that I won't let happen again.
Doug Lomheim
RV-3A
4.2 hrs now (for me)
https://www.dropbox.com/s/sg3n95mp5rxtz3k/Magneto ear broke.jpg
Doug Lomheim
RV-3A
4.2 hrs now (for me)
https://www.dropbox.com/s/sg3n95mp5rxtz3k/Magneto ear broke.jpg