Oil temp sensor

[procharger]

What is the thread size for these I ordered one but it was 10 mm mine is NPT what up

with that Aircraft Spruce can't figure it out? Oil temp?

[Tom Baker]

I have a 2006 CTSW in the shop. The oil temperature sensor is a VDO 801/10/1. The specs show it having a M12x1.5 thread. On the older engines it is the same as the CHT probe.

Oil pressure has NTP threads.

[Tom Baker]

Rotax parts catalog shows it to be the same part for the 912 and 914 series engines. The Rotax number is 965-531.

[procharger]

Roger I need temp sensor not pressure thanks 323-057 VDO 300' is that right

[Tom Baker]

https://www.ebay.com/itm/ROTAX-AVIATION-MOTOR-912-912S-914-TEMPERATURE-SENSOR-TEMP-PROBE-965-531/253838840098?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D72d79aa6bb174d58943e927706c37929%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D253838840098%26itm%3D253838840098&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3A6d579847-ac9d-11e8-86d6-74dbd180ca52|parentrq%3A8cc88b931650aadb33caeeb7fffb544d|iid%3A1

This matches the Rotax part number, plus I removed the one from the engine in the shop and it appears to be the same. The thread on this engine is definitely not a NTP pipe thread. 

[Tom Baker]

13 minutes ago, Roger Lee said:

The temp senders are $23 - $30 on Jegs.

I didn't see the one needed for the Rotax.

[zim]

Found the Oil Temperature sensor with M10x1.5 threads (912ULS and others) $20 USA

For those not wanting to spend $100-$220 on the Rotax 965351- VDO stopped manufacturing the 323-089 aka 323-801-010-001D aka Rotax 965351 - for Rotax and all Marine manufactures; this European company appears to make the same sender for the LSA / Rotax market

 

https://www.road-online.de/products/article.php?grp=&art=TC10.0000.0902.&sl=

Temperature sensor 50°C..150°C, NTC, UL/LSA

Thermistor 120°C = 36,5 Ω, 6V..24V

Same Specifications:

https://www.road-online.de/products/searcharticle.php?match=sensor

https://www.vdo-gauges.com/media/instructions/TU00-0770-5104620 Temperature Sensors_short_version.pdf

Buy at Aircraft Spruce (or others) part 10.0000.0902

https://www.aircraftspruce.com/catalog/inpages/flightline13-16029.php

[cdarza]

So i have a VDO 801/10/1  CHT Temp sender  for my 2006 Rotax 912 uls and im looking to purchase another sender.   I didnt realize it would be this difficult to locate one as i just assumed all Rotax 912 ULS were using the same.     I got close to buying a UMA sender as im using UMA analogue gauge however i was informed by UMA that the UMA gauge was calibrated to VDO sender thus UMA sender would not work unless i sent the gauge back for recalibration.   Dang this is getting difficult.     That UL Flight line as mentioned above to be ok for the Rotax but the threads look different than the VDO.        Best i could find was a backorder $195 on LEAF for a Rotax 965350.   Same as 965351 ?Anyone have updated info for this pls?    When did Rotax  change the compatible senders and are there multiple changes over the years or just the one -   so like what are the newer engines using.    Also,  if i also wanted to upgrade from my analogue gauges to the newer EMS would i be having a problem with compatible probes (senders) that fit my old engine?      I feel like i need to attend a special class for this....  Basic help appreciated. 

 

[Tom Baker]

If you have analog gauges you may already have an extra sender. For your vintage airplane the engine was normally shipped with a CHT probe on both cylinders two and three, (front left and right rear). With analog gauges normally only the front left probe is used for CHT, that leave the right rear un-used. You can swap that with the oil temp sensor, as they are the same part number. 

[cdarza]

Thanks for the reply. My cht sender is on the right rear.  No extra sender on the front left.   Thats where i wanna place the new sender im looking for and hook it up to a spare cht gauge that was graciously given to me from a member on this forum.  (Thanks again Bob Ryan !!)    Anyways, nothing that important so i will see where i go from here.   

[Vic]

Question for the group on this oil temp probe.  Mine just went bad and I have 2 spare CHT probes that I think will work.

Is this oil temp sensor in contact with the oil? I dont see any safety wire on mine, id hate to under torque it and bleed my engine oil out in flight.

 

 

 

[BravoFoxtrot]

I agree with Roger, the failure of these probes is very rare.

FWIW I had a problem with the spade connector being loose on the probe. When that happened I got erratic readings on temperature. All you need to do is pull it off the probe and squeeze down on the spade "curls". It just takes a little bit so don't get carried away. When it is right you will feel the difference. Good luck and let us know how it turns out.

[Vic]

Hey all,

I appreciate the help on this everyone, I was looking for a problem that didn't exist.

Yes you are were correct it was not the probe that failed.  I misread my GRT troubleshooting manual, the GRT EIS does not register any temperature below 59,  if the oil temp is actually 58, 57, 30, 20, 2 degrees the display just defaults to 59.  Must just be the way this EIS is engineered to read resistance from the probe and they decided to just default it.  I would have never noticed this before but since iv been adding engine pre heating and fixing my CHT temp probes I started noticing every change in temp.  The OAT was 20 degrees that day so the reading was correct at 59.   

I did test out one of my backup probes with this oil temp wire by heating it up with my hands and I was getting good readings, so proving the wiring was fine, once the proble cooled back down the EIS stopped at 59.  Just a little gotcha with this GRT I did not realize until I started focusing on fixing my CHT temp sensors and looking at the oil temp closer on these colder days up here in PA.  I never had oil temp reading issues so it felt way to coincidental that this was also failing during my CHT diagnosis.

 

Wrapping up this Fix it project I ordered the correct thermocouples for my CHT temp locations(I only have 2 CHTs for my 04 engine) and confirmed wiring and oil temp function with GRT Support.  Those guys are great it you have a GRT and need help figuring out the nuances with the system and our rotax setups.