Oil pressure sensor ... install without leaks

Discussion in 'Mazdaspeed 3/6 Engine' started by jsilva, Apr 1, 2021.

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  1. jsilva

    jsilva Silver Member

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    I was curious what techniques people here have used to eliminate leaks from the oil pressure sensor.

    The service manual says to use silicone sealant but it isn’t clear how much. I saw a video of someone using teflon tape—although strangely he doesn’t appear to put the pressure sensor all of the way in (you can see just after 1:40 that it is out maybe 1/4”):

    Any information people can share?
     
  2. Awafrican

    Awafrican Moderator Gold Member

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    Awafrican, via a mobile device, Apr 1, 2021
    #2
  3. jsilva

    jsilva Silver Member

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  4. Cfoldone

    Cfoldone Silver Member

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    As Awafrican said. Pressure sensor is a taper. When I installed, used a semi set sealant. For situation where the taper thread is buggered from over torque use a hard set thread sealant. Both threads must be clean & give it time to set up well. PXL_20210402_035543647.jpg
     
    Cfoldone, via a mobile device, Apr 2, 2021
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  5. nekret

    nekret Platinum Member

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    FWIW I've been using loctite 545 for hydraulic and pneumatic fittings over the past year without really any failures seems to hold up well to gasoline, oil, methanol, etc.
     
  6. Awafrican

    Awafrican Moderator Gold Member

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    Awafrican, via a mobile device, Apr 2, 2021
    #6
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  7. jsilva

    jsilva Silver Member

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    I used the ‘Form-A-Gasket’ today and will start the car tomorrow. Not sure if I applied enough or too much, and I didn’t put the sensor in all of the way (left it out about 1/8”). We’ll see if it stops the leak!
     
  8. Awafrican

    Awafrican Moderator Gold Member

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    Was it tight? Don't leave it out of it's not snug
     
    Awafrican, via a mobile device, Apr 3, 2021
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  9. amnesiac

    amnesiac Silver Member

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    If it doesn't fix it you may want to replace the sensor. Mine was leaking from the sensor itself, not the threads.
     
  10. Tomas

    Tomas Platinum Member

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    That's what she said.
     
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  11. jsilva

    jsilva Silver Member

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    So my re-attempt at stopping the leak didn’t fully work—it’s dripping so not an actual problem (and the engine oil level isn’t going down), but obviously I should replace it so I ordered one.

    5A74874A-8F22-470C-B126-9EBC16BE9DEE.jpeg

    Do I not need to add sealant?
     
  12. Awafrican

    Awafrican Moderator Gold Member

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    that's sealant already on the threads, you *should* be good without more
     
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  13. jsilva

    jsilva Silver Member

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    I decided to order the part for the screw-on filter conversion. So I’ll wait to install the sensor until I actually do the conversion and hope the leak doesn’t get worse :)
     
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