Temp/Pressure indicating suddenly high
in 912 / 914 Technical Questions
14 years ago
I was doing a crocodile count around St Lucia, all temps and pressures fine, weather cool, when over a period of about ten minutes the cylinder head and oil temperatures went up, but also very unsteady, the one cylinder went as high as 175 deg, which I suspect is not possible but it stayed there for about 10 seconds, then came down to 120, then back up etc. The other cylinder head temperature was much lower, but also from time to time went up above 130 deg C
The oil temperature would go up to 150 and then back down to 120 in a matter of seconds, and then stabilize for a while at 100.
I did a precautionary and checked the water and oil levels and all was fine, so I do not believe that the water actually boiled as no coolant was lost. I took off again and within a minute or so the temps were back up again, another precautionary, levels all fine, took off again and flew back to Empangeni, a 15 minute flight.
During the flight back to Empangeni I throttled way back to 4200 rpm and the temps would stay fine, and then all of a sudden would increase to 130+ on water and up to 160 on oil. On landing in Empangeni, again checked and all levels fine. At no time did the engine smell hot. My concern is that this was coming from 3 different probes, 2 x cylinder head, and 1 x oil temperature. Oil pressure at all times was OK 3.5 bar +
I have an oil thermostat installed, otherwise a stock standard 912S that has never previously displayed this king of "overhearing" problem.
The oil temperature would go up to 150 and then back down to 120 in a matter of seconds, and then stabilize for a while at 100.
I did a precautionary and checked the water and oil levels and all was fine, so I do not believe that the water actually boiled as no coolant was lost. I took off again and within a minute or so the temps were back up again, another precautionary, levels all fine, took off again and flew back to Empangeni, a 15 minute flight.
During the flight back to Empangeni I throttled way back to 4200 rpm and the temps would stay fine, and then all of a sudden would increase to 130+ on water and up to 160 on oil. On landing in Empangeni, again checked and all levels fine. At no time did the engine smell hot. My concern is that this was coming from 3 different probes, 2 x cylinder head, and 1 x oil temperature. Oil pressure at all times was OK 3.5 bar +
I have an oil thermostat installed, otherwise a stock standard 912S that has never previously displayed this king of "overhearing" problem.
