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Have you taken the oil pressure gauge out, put the bulb in a pan of boiling water and noted the reading? One failure mode for such creatures is that they go to a certain temperature...and then short...causing a false high reading. Greg At 09:16 AM 9/17/02 -0500, John wrote: >----[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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