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What was your altitude where you started your flight and where the problem began. I suspect you were descending which would require a richer mixture. If not lower I would expect that you have blockage in carbuerator and not running richer. Make absolutely sure timeing is correct as it will cause this condition.Good luck and keep us posted. Jim A&P, N87349 ----- Original Message ----- From: "John" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, September 17, 2002 8:16 AM Subject: [COUPERS-FLYIN] Overheating problem > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > O.K. folks, > > This is long but it is the only way I can describe the problem and what we > have done to date. > > Two Thursdays ago I was flying from Sporty's to Elizabethtown, Ky when I > experienced a severe oil overheating problem. I put the plane down and had > to leave it up north while I went back to work and came back down south > here to Alabama. > > > My 415CD (C-75, no oil cooler) runs around 180 degrees on a normal summer > day. 30 minutes into my return flight I noticed the oil temp stretching up > to 200 degrees and above. As it approached 225 degrees(my redline) I > started looking for a place to put her down before drastic things began to > happen. As I found a place to land, the oil temp reached about 250 degrees > and I heard three knocks in the engine. My A&P has convinced me this was > predetonation. I immediately throttled back on RPMs and the knocking went > away. Landed with no problems. Throughout the situation, the engine never > sputtered, ran rough, or lost oil pressure below my green line. After I > landed, I checked the oil level and had a full 4qt reading. > > Last weekend, on my A&P's instructions I returned to Kentucky, got an A&P > form a nearby airport and performed the following checks. > > 1. Changed oil and checked screen. Found no indication of problems on the > screen. > 2. Performed compression check. Results 72/68/68/68 > 3. Checked spark plugs for fouling. A&P said they looked fine > 4. Performed Magneto alignment check. All ok. > > There is no indication that airflow was restricted that could have caused > the overheating. > In other words, we found no smoking gun. After all the checks were complete > I took the plane for a test flight. In 15 minutes flat I was at redline > again. I put her down and now the A&P and I are scratching our heads. He > wants suggestions from owners as to what else could create this problem > before he starts pulling cylinders. > > Any suggestions/advise is appreciated. > > John Adams > Huntsville, Alabama > ================================================================== > TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm > > > > ================================================================== TO UNSUBSCRIBE go to: http://ercoupers.com/lists.htm
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