Oil Temp Increases on 912UL
in 912 / 914 Technical Questions
10 years ago
After I installed the larger Rotax oil cooler on my Zenith 701 with a 912UL (about 350 hours) the oil temp was dependably never about 190F. Flights were first in hot/humid conditions in Florida and now central Africa. Pressure would start off in the 60s, and settle at 53 or so. These conditions (180-190 and 53 psi) seemed like benchmarks.
About three weeks ago I was climbing from 2000MSL to 3000MSL and the oil temp drifted up to 230F, and did not reduce after I stabilized at altitude.
The high oil temp issue now occurs every time I fly. Yesterday in a test flight the oil temp rose above 240, and the pressure dropped to the 40s, maybe due to viscosity issues at the higher temperatures. Quick return to the airport.
In what may be a separate issue, I experienced diminished climb performance. Yesterday, after renewing air filters and making certain plugs were cleaned and gapped properly, I did see some improvement, reaching 750 fpm at DA of about 2500.
Ideas about courses of action welcomed!
About three weeks ago I was climbing from 2000MSL to 3000MSL and the oil temp drifted up to 230F, and did not reduce after I stabilized at altitude.
The high oil temp issue now occurs every time I fly. Yesterday in a test flight the oil temp rose above 240, and the pressure dropped to the 40s, maybe due to viscosity issues at the higher temperatures. Quick return to the airport.
In what may be a separate issue, I experienced diminished climb performance. Yesterday, after renewing air filters and making certain plugs were cleaned and gapped properly, I did see some improvement, reaching 750 fpm at DA of about 2500.
Ideas about courses of action welcomed!
