I had my first stuck exhaust valve on an O-300 in my Maule M4. I've flown this quite a bit and most recently a couple of days ago. My friend borrowed it and flew it to Big Bear. Stayed overnight and flew it back in the morning. Barely got off the ground... Luckily it's all downhill to Flabob from there. He thought he was running on five cylinders. No, he was running on four. Two rear, left cylinders had no compression when I pulled the prop through after he landed.
Nothing unusual in one stuck valve but two!?!
We're doing the usual rope-trick fix. What I'd like to know is how to prevent it. People swear by Marvel Oil or TCP or even two-stroke oil. I have on occasion used MMO, based on the ton of anecdotal evidence out there but not on a regular basis.
The engine does not run hot generally , neither oil not CHTs. It was about 100 degrees here that day, but the seizure happened when it was pretty cool p there.
Nothing unusual in one stuck valve but two!?!
We're doing the usual rope-trick fix. What I'd like to know is how to prevent it. People swear by Marvel Oil or TCP or even two-stroke oil. I have on occasion used MMO, based on the ton of anecdotal evidence out there but not on a regular basis.
The engine does not run hot generally , neither oil not CHTs. It was about 100 degrees here that day, but the seizure happened when it was pretty cool p there.