stuck valve pics, how to learn from other peoples mistakes.

[turbo]

plane: 2 to 3 year old Cessna 182 with 3 to 4 hundred hours
pilot not educated on leaning procedures, likes to run at high altitudes and high power settings
the pilot was enroute to flying club event when he apparently stuck a valve and was able to continue flight with a rough running engine to destination event airport with a maintenance facility where the plane remained for repairs. I hate to hear about events like this but they will continue to occur. get educated on this stuff. chime in on your thoughts. the pics are a sad condition on an engines condition not fit to fly. turbo out.

 

[moespeeds]

So stuck valve why? What's the stem/guide look like?

 

[BH1166]

With his known engine mgmt technique, his A&P should be doing this. Wobble test.

https://www.lycoming.com/sites/default/files/attachments/Procedure%2520to%2520Determine%2520Exhaust%2520Value%2520and%2520Guide%2520Condition.pdf

 

[Full Throttle]

The valve in the picture looks way off center. Almost bent ....

 

[turbo]

So stuck valve why? What's the stem/guide look like?

carbon build up between the valve guide and valve stem resulting in sticking valves or; broken exhaust valves which result from excessive wear (bell-mouthing) of the exhaust valve guide.

 

[RV-4]

I just did this SB this week after noticing a little engine hesitation specially at low RPM...We didn't find much carbon deposit but maybe just enough to get the engine to stumble a little...
It was just at the range suggested by Lycoming ( 400 hrs )
After a few run-ups to see if the condition will re-occur, it is as smooth as a turbine..