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I recently bought an aircraft with Rotax 912 ULS manufactured in late 2002.  The oil pressure gauge is not working so I'd like to replace it and the sensor.  What VDO unit and gauge do you recommend and from which US supplier? Thank you.

 

  • Re: Oil pressure sensor and gauge

    by » 5 months ago


    Whatever gauge/sensor you purchase, should be able to accomodate the following pressure range (taken from the Rotax Operators Manual):

           Max. 7 bar (101.5 psi)

           Oil pressure max. for a short period admissible at cold start.

           Min. 0.8 bar (11.6 psi) (below 3500 rpm) 1.5 bar (22 psi)

           Normal 2.0 to 5.0 bar (29-72.5 psi) (above 3500 rpm)

    If you check out the VDO (or alternatives) web site, you should be able to find a gauge/sensor that will operate over the above ranges eg VDO Part Number 1501072 - you will then need a matching sender/sensor, that will suit both the gauge & your Rotax oil pressure port.

    The above is an all electric system - alternative would be mechanical, which tends to have a better range however issues with vibration may be a concern.

    Also what makes you think the gauge and or sensor, needs replacing?

     


  • Re: Oil pressure sensor and gauge

    by » 5 months ago


    Hello William, you don't mention having attempted at least some trouble shooting of possible wiring faults, power, ground, etc. Please do consider fault finding prior to changing out both units, who knows, it could simply be a broken wire.

    If you decide the sender & indicator are both indeed faulty and you must exchange both, you will need to firstly determine which part number oil pump housing is fitted to your engine as the sensor screw thread will determine which sensors are suitable (or an adapter required) and from there, find compatible gauges. Rotax Service Instruction SI-912-030 details this quite well.

    https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-912-030.pdf

    Aircraft Spruce and Specialty in the USA lists quite a few options for both senders & gauges, a simple "rotax oil pressure" search on their website will reveal them. Perhaps not the cheapest place to shop but a good place to start looking I think.

    https://www.aircraftspruce.com/

    The VDO USA website is extensive!

    https://www.usa.vdo.com/

    Hope this helps.

    Cheers.

    Edit to add these links

    https://www.vdo-instruments.com/product-category/instruments-displays-and-clusters/

    https://mitchellproducts.com/


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