have your mechanic teach you the rope trick to ream the valve guides without removing the cylinder.
1. Confirm the stuck valve - usually an exhaust valve partially open. 2. Purchase the proper reamer, and magnet on a stick. 3. Remove the valve cover, rockers, shaft and spark plugs. 4. With the piston down, stuff the cylinder full of 3/8 or so, nylon rope, bring the piston up to hold the valves closed with the piston and rope. 5. Remove valve keepers, and valve springs. 6. Clean on the valve stem with some Marvel and scotchbrite pad. 7. lower piston, remove rope, push valve into cylinder, 8. drop valve stem out sparkplug hole and clean with scotchbrite pad. 9. run reamer into valve guide, clean out carbon and lead buildup with reamer. 10. Using magnet to pull valve back into guide, with support from safety wire through the spark holes. 11. Once valve is in position, stuff cylinder full of soft rope, piston up and install valve springs and keepers. 12. Reswedge push rod tubes. 13. Install rockers, shaft, clean valve cover gasket surfaces, and valve covers. 14. Clean and gap spark plugs and install. 15. Go ahead and do all four cylinders. mitch ---- Al Demarzo <[EMAIL PROTECTED]> wrote: ============= You didn't cook the engine, sounds like you may have a stuck valve. At most the cylinder may have to come off and the valves gone over. Your mechanic should have a few ideas and maybe after getting it going you can see how this can be prevented. Are you using TCP in the fuel? ----- Original Message ----- From: surmicks To: [email protected] Sent: Sunday, June 15, 2008 7:39 PM Subject: [ercoupe-tech] Stuck Valve? Greetings, Just came in from the field after suffering what I think is a stuck valve but I am not sure as I have no experience with them. Have been flying my Alon A-2 with a C-90 all year long with no problems. Today I fired it up and the engine was somewhat rough on taxi. During run up it was really rough, cycling the mags gave only a 75 rpm drop. Use of carb heat dropped the rpm by 200 instead of the normal 100. Full power run up gave only 1900 rpm and incredible roughness. Well can't fly on 1900 rpm so I taxied back to my hanger shut the engine down and checked the cylinders heads for heat. Three out of the four cylinders were very hot, one was noticeably much cooler. I pulled the prop through thinking it might work it self free, tried to start the engine and no go. It will not start. That was it for me. I put her away and will call my A&P tomorrow to find out what is up. In the meantime anyone out there have any ideas? Did I trash my engine? I didn't see any metal on the dip stick after shutting the thing down. thanks for any ideas. Chad Surmick Alon A-2 N5479E -- Learn2fly www.chickashawings.com
