M20J IO-360 exhaust valve failure 20 hours SMOH

[OleBob2003]

In late March, on another break-in flight, 20 hours SMOH, KCNO to KPRB our engine went rough over Lake Casitas. We turned back to Oxnard, declared an emergency and landed with power.

Our mechanic found a hole in #3 cylinder wall and the adjacent baffle. Later, the overhaul shop owner removed the cylinder and sent it back to CMI. No other damage was found in the other bore-scoped inspected cylinders. The exhaust valve had broken near the keeper and exited the cylinder. CMI called it an isolated incident. Thus far, per an email cc, it appears that CMI is denying any warranty claim. They are apparently claiming over-speed as the cause. The overhaul shop owner sent the JPI data showing no over-speed. We had been following Lycoming break-in procedures. We thought we’d share what’s happen with our overhauled engine and the CMI cylinders.

[Justin Schmidt]

I found bringing in an aviation lawyer changes people's minds real quick. 

[PT20J]

If you have AOPA pilot protection you could discuss with one of their attorneys for free. 

[OleBob2003]

Yep, you’re right. Figuring who to talk to will be Monday’s task. I’ll start with AOPA first.


Sent from my iPhone using Tapatalk

[skykrawler]

Who is CMI?  Is that supposed to mean Continental Aerospace Technologies?

See other post (3 cylinders) concerning broken valve parts migrating around the induction system.

 

[OleBob2003]

Yes CMI is Continental. I think CMI is or was Continental Motors


Sent from my iPhone using Tapatalk

[jetdriven]

Was it a continental prime PMMA cylinder for a Lycoming?  
if you have all the JPI data from when the engine was put on, and there’s no overspeed I would send it to them with a letter of demand.