Your valve stuck probably due to a worn guide. What would make the guide go bad? Well, wear and tear mostly. You should really examine how you operate the engine from startup to shutdown to startup.
Your guide may have failed due to the high temps but the high temp wasn't caused by a bad guide. With the engine (that cylinder) open all the time there should have been slight burning of fuel. Slight fuel burn means lower temps. If you have an engine monitor that displays all cylinders, you can keep track of those things. 400 degrees is waaay too hot regardless of what Continental tells you. My alarms are set at 380. Check this out a bit and learn a little. After taking the course you'll know how to properly run any engine made. http://www.advancedpilot.com/ Can't comment on the on-line course, but the classroom was incredible. ----- Original Message ----- From: alanrayj To: [email protected] Sent: Saturday, April 04, 2009 12:52 PM Subject: [ercoupe-tech] Cylinder head Dear group, I have posted several times about the engine being sluggish on takeoff in my M-10 and the mechanic found a stuck intake valve on the number 4 cylinder which could not be fixed so I am having the cylinder replaced. What would cause this to happen? The oil was changed in January and it has only been flown around 25 hours since the change. My mechanic I am using now did not do the annual and the other cylinders where not damaged. He is not sure why this exhaust intake valve stuck open, and the others appear to be in good shape after breaking down the engine. Also the cylinder head temperature gauge was reading around 400 F which. I landed several I think was because of the stuck exhaust valve on number 4. Has anyone else had this experience and what was the outcome? Alan
