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Hi Steve, If I were you, before I went to the trouble and expense to open the engine I would go out the next two nice days and fly about five hours using low altitude and fairly high power settings (about 75%) and do climbs at full power followed by power decent at about 65% power. This will if it works clean the valves and it should help make sure the rings are moving as well. If the compression comes right on all cylinders then I would keep flying a good engine. The key to this is that it sounds like you have some mild corrosion on your exhaust valves and some hard running will likely clean them up. Your milage may vary and you should do what your A&P thinks best. Best regards, Vern It has come time for me to do some serious thinking about my C90 in the Forney. It has about 700 hours on it since the last overhaul, which is not even shown in my logs. The engine was apart about 15 years ago when I bought it because the previous owner had a prop strike. At that time the crank was replaced, and everything else checked out. Now the cylinders are reading a bit low...two are around 60 with the others 67-68. The engine does not get a lot of use and sits alot, but it runs smoothly and has new slick mags, and does not burn a lot of oil. The leakage seems to be from the exhaust valves. I am getting to the point where I think its time to have a look inside the engine, and maybe pull the engine completely apart. I should mention that I am one of those Canadian coupers who operate on owners maintenance, so I have a lot of options open to me. My current plan is to have my mechanic take a hard look at the engine this month, since my annual needs to be done. I have been thinking of doing a teardown and rebuild if necessary under the watchful eye of my mechanic. I am not all that interested in having a full overhaul done, I am interested in a thorough condition check and repair and replace parts as necessary. Just to eliminate spam I am a VERY careful person and am not foolish enough to think I can do this myself without a lot of help and advice. I was just wondering what others who have come to this stage of engine life have done and would welcome any advice. Also....to add to the trim-quadrant debate that appeared earlier on the list as it applies to late model coupes and forney's. I replaced the entire quadrant with vernier throttle and mixture controls. The trim was replaced with the older model trim control on the left wall. I have never regretted the move. Once again, I am under owner-maintenance and have much more latitude for mods, but I can't see why it would be difficult to get a 337 signoff for the trim change, since the type design was used in earlier models of the same airframe. Steve Finkelman Forney F1 C-FIWR [EMAIL PROTECTED] ================================================================== TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm ================================================================== TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm
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