---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 08/17/14: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:39 AM - Re: Oil Pressure on Rotax 912UL (Roger Lee) 2. 10:36 AM - Re: Re: Oil Pressure on Rotax 912UL (Damien Graham) 3. 10:37 AM - Re: Oil Pressure on Rotax 912UL (Damien Graham) 4. 10:48 AM - Re: Oil Pressure on Rotax 912UL (FLYaDIVE) ________________________________ Message 1 _____________________________________ Time: 07:39:43 AM PST US Subject: RotaxEngines-List: Re: Oil Pressure on Rotax 912UL From: "Roger Lee" You need a gauge to go up to at least 100 psi. The max oil pressure can be up to 72 psi. If the oil pressure sender has something on the threads it won't ground properly. Make sure all your grounds are tight because this will cause this type of issue. Senders are more often at fault than the gauge itself by a long shot. Before you do anything put a mechanical gauge on the oil system to check the real pressure. This can be done down at the sender. Usually the port right in front of the oil pressure sender can be used. It is only plugged off with a screw. It is a 1/8"x27 NPT. You can use an inexpensive gauge of 100 psi from Ace Hardware. If you have the old style oil pressure regulator ball-bearing this migh be adding to your problems. Even if you don't get the extended TBO it is worth spending the $75 and ten minutes to install it. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint. Rated Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=428603#428603 ________________________________ Message 2 _____________________________________ Time: 10:36:12 AM PST US Subject: Re: RotaxEngines-List: Re: Oil Pressure on Rotax 912UL From: Damien Graham Thanks Roger. I always appreciate your advice. Regards, Damien On Aug 17, 2014, at 10:39 AM, Roger Lee wrote: > > You need a gauge to go up to at least 100 psi. The max oil pressure can be up to 72 psi. > If the oil pressure sender has something on the threads it won't ground properly. Make sure all your grounds are tight because this will cause this type of issue. Senders are more often at fault than the gauge itself by a long shot. > Before you do anything put a mechanical gauge on the oil system to check the real pressure. This can be done down at the sender. Usually the port right in front of the oil pressure sender can be used. It is only plugged off with a screw. It is a 1/8"x27 NPT. You can use an inexpensive gauge of 100 psi from Ace Hardware. If you have the old style oil pressure regulator ball-bearing this migh be adding to your problems. Even if you don't get the extended TBO it is worth spending the $75 and ten minutes to install it. > > -------- > Roger Lee > Tucson, Az. > Light Sport Repairman - Maintenance Rated > Rotax Repair Center - Heavy Maint. Rated > Home 520-574-1080 TRY HOME FIRST > Cell 520-349-7056 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=428603#428603 > > > > > > > > > > ________________________________ Message 3 _____________________________________ Time: 10:37:55 AM PST US From: Damien Graham Subject: Re: RotaxEngines-List: Oil Pressure on Rotax 912UL Thanks Craig. I found the 10 bar stamp on the original sender. I will order the correct replacement. Thanks again. Regards, Damien On Aug 16, 2014, at 8:27 PM, Craig Payne wrote: > I think "bar 5" or "bar 10" is stamped on the side of the sensor's hex nut. > > -- Craig > > > On Sat, Aug 16, 2014 at 5:07 PM, Damien Graham wrote: > > Thanks very much. > Regards, > Damien > > Sent from my iPad > > > On Aug 16, 2014, at 7:02 PM, Alan Sandul wrote: > > > > > > Had the same problem and I had ordered the 5 bar sender and not 10 bar sender. They will exchange if that is the problem. > > > > Sent from my iPhone > > > >> On Aug 16, 2014, at 5:22 PM, Damien Graham wrote: > >> > >> > >> Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for a flight last week the VDO oil pressure gauge was reading high off the scale. I pulled the cowling and found that the wire had come loose from the sender. A non-aviation mechanic friend and I managed to damage the sender so I order a new VDO sender from Aircraft Spruce. > >> My IA was helping me with some upgrades on my Zodiac and he replaced the sender today. When I powered up today the oil pressure gauge was still reading high, 135, but it was not off the scale. I shut down and powered up again and it read 120. > >> We are wondering if the VDO oil pressure gauge was affected by the earlier off scale readings when the wire was broken. If so, will the gauge come back to normal readings or should I buy a new VDO oil pressure gauge and see if that fixes the problem? Thanks. > >> Regards, > >> Damien Grtaham > >> N48TK > > > > > > > > > > > > > ========== > - > xEngines-List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List > ========== > FORUMS - > _blank">http://forums.matronics.com > ========== > b Site - > -Matt Dralle, List Admin. > target="_blank">http://www.matronics.com/contribution > ========== > > > > > > > > ________________________________ Message 4 _____________________________________ Time: 10:48:48 AM PST US Subject: Re: RotaxEngines-List: Oil Pressure on Rotax 912UL From: FLYaDIVE NOT LIKELY! Since your VDO sending unit is ELECTRIC and since the sending unit has ONLY a low voltage and high voltage limit - Even it the real pressure increased to 500 PSI the output of the sending unit STILL would be ONLY the max allowed by the unit. Ergo, it would NOT damage the indicator gauge. NOW! What you and the group should do is take Voltage reading Vs Pressure indications. Post those readings to the group and PLOT the resultants... Voltage Vs Pressure. Now, knowing those values you should be able to say: X Voltage (Low End) = X Pressure, Y Voltage (Middle) = Y Pressure, Z Voltage (High End) = Z Pressure and this would be Max Pressure readable by the gauge. Crazy question: Is there a manual for the unit which gives a check value? I also noticed there are a few different sending units... Which unit do you have? Which did you replace it with? Here is a unit that reads from a Low of 11.4 PSI to a high of 150 PSI. NOW! This unit even give a resistance value of 0 to 180 Ohms. You can either read the output voltage across the sending unit or remove the wires and read the resistance. But, the question is WHY is the pressure dropping each time? COLD oil will cause high oil pressures and as the oil temp increases the pressure will drop. Is that what you are seeing? Barry On Sat, Aug 16, 2014 at 5:22 PM, Damien Graham wrote: > dgraham7@twcny.rr.com> > > Hello. I have a 14 year old Rotax 912UL 80hp engine. When I powered up for > a flight last week the VDO oil pressure gauge was reading high off the > scale. I pulled the cowling and found that the wire had come loose from the > sender. A non-aviation mechanic friend and I managed to damage the sender > so I order a new VDO sender from Aircraft Spruce. > My IA was helping me with some upgrades on my Zodiac and he replaced the > sender today. When I powered up today the oil pressure gauge was still > reading high, 135, but it was not off the scale. I shut down and powered up > again and it read 120. > We are wondering if the VDO oil pressure gauge was affected by the earlier > off scale readings when the wire was broken. If so, will the gauge come > back to normal readings or should I buy a new VDO oil pressure gauge and > see if that fixes the problem? Thanks. > Regards, > Damien Grtaham > N48TK ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.