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Old 07-03-2022, 08:04 AM
JamesClarkIV JamesClarkIV is offline
Join Date: Feb 2011
Location: Gainesville, VA
Posts: 62
Default High Oil Temp - Vernatherm or Sensor or Other?

I have had 3 unusual oil temperature events over the last 6 flights. RV7A IO-360-M1B with ~1000hrs of normal 180F-200F oil temp readings. I will post engine data pictures below in hopes folks can help me identify possible causes.

First occasion was on a few laps around the pattern to warm the oil prior to an oil change. Engine oil temp was normal until 2nd landing approach, oil temp rapidly rose from 203 to 230(yellow) after pulling power for landing during final.

I then changed the oil. And did 3 more laps around the pattern after oil change with no issues observed.

Next flight was 3 hour trip VA to GA. No issues observed.

Next flight was 3 hour return GA to VA. The oil temp issue showed twice. Once early in the flight just after top of climb at 9500. Sudden oil rise occurred just after climb level off power adjustments. Rise was 208 to 236(yellow) in 60 seconds. I enriched mixture and pulled throttle some and oil temp cam back down. I decided to stay high and continue home rather than land.

At the end of the same 3 hour flight after descending from 11,500 to 1300 pattern altitude, and after turning final and pulling power, the oil temp rapidly rose from 210 to 245 in the span of 30 seconds.

Could this be caused by faulty sensor? Could this be caused by vernathern that is opening and suddenly shunting hot oil away from oil cooler and dumping it onto the oil temp sensor (is this sensor at the output of the oil cooler return line?).

I will attempt to post engine log pictures below. Thanks in advance for any ideas.
Jim Clark
2015 RV7A 1000 hrs
2022 RV10 Emp + Fuse + FWF 90% done, waiting on Wings
Manassas VA
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