----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Get yourself one of those thermometers that your wife uses to cook her turkeys. Take it up on the test flight again, get temp up to redline, land her, and put the probe up against the oil tank. See if it's hot or not. Larry ----- 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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