Sean Posted September 18, 2009 Share Posted September 18, 2009 Hi. Problem: fluctuating oil pressure readings. The actual engine oil pressure is fine, used a another type of gauge to verify. The wiring loom seems fine too. So suspect oil pressure sender or Flydat panel. Does anyone know of a better priced oil pressure sender to suit Flydat? The best I have seen is $600 AUD. Does anyone know of a used Flydat panel for sale? Cheers. Sean. Link to comment Share on other sites More sharing options...
Guest Crezzi Posted September 18, 2009 Share Posted September 18, 2009 very unlikely to be the flydat Sean but you should be able to easily prove this by putting a variable resistor in place of the sensor. The Rotax manual has a graph of what value is produced for different oil pressures. I've had a pressure sender fail with same fault (occasionally fluctuating and the "spikes" were enough to trigger the Skydat alarm). IIRC I got my replacement from Richard Eacott but I don't remember paying that much for it ! Be aware that the newer engines use a different (apparently better) type of sender but its not compatible with the older sensor / instrument setup. Hope that helps John Link to comment Share on other sites More sharing options...
Guest Maj Millard Posted September 18, 2009 Share Posted September 18, 2009 Yes I have seen the oil pressure senders fail also. However 9 times out of 10, and I hear it all the time, it is simply the blade connector vibrating or moving, where it is connected to the sender. I always put a dob of silicon on the connector, and never have anything but a steady needle....................................................... Link to comment Share on other sites More sharing options...
Guest Crezzi Posted September 19, 2009 Share Posted September 19, 2009 Yes I have seen the oil pressure senders fail also. However 9 times out of 10, and I hear it all the time, it is simply the blade connector vibrating or moving, where it is connected to the sender. I always put a dob of silicon on the conector, and never have anything but a steady needle....................................................... Unfortunately this wasn't so in my case but definately worth checking before you stump up for a replacement ! Cheers John Link to comment Share on other sites More sharing options...
Sean Posted September 19, 2009 Author Share Posted September 19, 2009 Hi John & MM. Thanks, have checked wiring loom/connectors and looks fine so it is probably the sender. Will hunt around for a good price. Cheers. Sean. Link to comment Share on other sites More sharing options...
Sean Posted October 6, 2009 Author Share Posted October 6, 2009 New sensor unit fixed it. Now if someone in this forum can give me the winning numbers for next Saturday's lotto draw, everything in the world would be sweet.....!!!! Cheers. Sean. Link to comment Share on other sites More sharing options...
rick-p Posted October 6, 2009 Share Posted October 6, 2009 New sensor unit fixed it.Now if someone in this forum can give me the winning numbers for next Saturday's lotto draw, everything in the world would be sweet.....!!!! Cheers. Sean. Hi Sean I have had the same problem, who is the manufafacturer of your new sensor and the part no.? Also, what was the cost? I just love it when things go wrong it gives me something to whinge about and unload a bit more money on. BY THE WAY THE WINNING NUMBERS FOR NEXT SATURDAY'S LOTTO ARE:- 3, 4, 13, 26, 39 & 40 Regards :baldy: :kboom: Link to comment Share on other sites More sharing options...
Sean Posted October 7, 2009 Author Share Posted October 7, 2009 Hi Rick. I will find out for you and I will use those lotto number this week too. Cheers. Sean. Link to comment Share on other sites More sharing options...
wags Posted October 29, 2009 Share Posted October 29, 2009 Maybe it's not sender! Shaun, Like many others I also suffer from badly fluctuating oil pressure. However I believe it is most likely not the sender that is malfunctioning but the oil pressure regulator itself. The sender is approx $340 whereas the replacement part for the pressure regulator costs only a fraction of that. I have a new part "in the mail" and will post the result after I have fitted it. Before you go off and order the new part however check all your ground wiring connections are nice and tight, especially the bus behind the pax side instrument panel. ROTAX have come out with a replacement for the "ball" in the oil pressure regulator - the replacement part number is 857-230. This is a "conical" shaped replacement for the ball and I quote you two very recent comments direct from the ROTAX factory in respect of this new part... "ROTAX is now switching from a ball valve PN-432-680 to a cone shaped valve PN-857-230. According to the charts sent over with this info, the new valve will result in a higher average oil pressure across the entire range of RPMs. This product has been under development for the past two years and IS NOT A MANDATORY RETROFIT nor is it covered under warranty." "This valve: PN-857-230, really offers a solution for engines with deviating (fluctuating) oil pressure indication only– this part should improve the reading. Reason: ROTAX has no influence over what reading devices the customers do mount, they can’t test all available Oil Pressure Gauges or EMS in the world. Therefore they have come up with this update as a replacement for all installations not using the tested ROTAX Flydat." Wal (at Bert Floods) happened to have one of the new parts with him after a visit to the Rotax factory and I have been lucky enough to have him send it to me. Hasn't arrived as yet however. Link to comment Share on other sites More sharing options...
Tracktop Posted October 29, 2009 Share Posted October 29, 2009 BY THE WAY THE WINNING NUMBERS FOR NEXT SATURDAY'S LOTTO ARE:- 3, 4, 13, 26, 39 & 40 Regards :baldy: :kboom: Come on Rick, we only good and accurate info on this site these numbers didn't work or was it because I looking at the wrong week or lotto? Link to comment Share on other sites More sharing options...
Sean Posted October 30, 2009 Author Share Posted October 30, 2009 Hi Wags. Thanks for the info. We got a new sender for under $200 and the oil pressure readings are now fine. Hi Rick. Did you get my PM about the replacement sender? And those lotto numbers were no good at all..!!!! Cheers. Sean. Shaun,Like many others I also suffer from badly fluctuating oil pressure. However I believe it is most likely not the sender that is malfunctioning but the oil pressure regulator itself. The sender is approx $340 whereas the replacement part for the pressure regulator costs only a fraction of that. I have a new part "in the mail" and will post the result after I have fitted it. Before you go off and order the new part however check all your ground wiring connections are nice and tight, especially the bus behind the pax side instrument panel. ROTAX have come out with a replacement for the "ball" in the oil pressure regulator - the replacement part number is 857-230. This is a "conical" shaped replacement for the ball and I quote you two very recent comments direct from the ROTAX factory in respect of this new part... "ROTAX is now switching from a ball valve PN-432-680 to a cone shaped valve PN-857-230. According to the charts sent over with this info, the new valve will result in a higher average oil pressure across the entire range of RPMs. This product has been under development for the past two years and IS NOT A MANDATORY RETROFIT nor is it covered under warranty." "This valve: PN-857-230, really offers a solution for engines with deviating (fluctuating) oil pressure indication only– this part should improve the reading. Reason: ROTAX has no influence over what reading devices the customers do mount, they can’t test all available Oil Pressure Gauges or EMS in the world. Therefore they have come up with this update as a replacement for all installations not using the tested ROTAX Flydat." Wal (at Bert Floods) happened to have one of the new parts with him after a visit to the Rotax factory and I have been lucky enough to have him send it to me. Hasn't arrived as yet however. Link to comment Share on other sites More sharing options...
wags Posted October 30, 2009 Share Posted October 30, 2009 Rotax Part No: 857-230 The part has arrived and here is what it looks like as opposed to the ball it replaces. Will fit tomorrow and get back to this forum. Link to comment Share on other sites More sharing options...
wags Posted October 31, 2009 Share Posted October 31, 2009 Roatx 912 steady at last! As promised the new Rotax Oil Pressure Regulator part (857-230) was fitted today. Subsequent engine run was a joy to behold... rock steady indications at all power settings. Certainly has fixed the problem of fluctuating oil pressure for me. Figures I noted during static run-up are (all are with engine oil temp above 50ºC)... 2000 RPM 38 psi (2.6 bar). 3500 RPM 44 psi (3 bar). 4500 RPM 47 psi (3.2 bar). 5200 RPM 54 psi (3.7 bar). With both increasing and decreasing power settings the oil pressure changes were smooth and what can best be described as precise. Fitting took all of 5 mins including re-doing the tie-wiring. Understand Floods will not have spares for about 3 to 4 weeks. All I can say is go for it! Link to comment Share on other sites More sharing options...
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