Leaking engine oil pressure sensor (with pics)

Discussion in 'GT350 and S550 Technical Forum' started by THX 138, Jun 11, 2018.

  1. THX 138

    THX 138 TMO Intermediate

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    Posting this in case it might help somebody else. After a track day on Saturday, I noticed that I had a belly pan full of oil, and I was down a quart. I figured it was probably a loose oil filter (even though I ALWAYS torque mine to spec), but I looked at the Sharpie marks I made when I tightened the oil filter, and it hadn't moved. Odd. Must be something else...

    I cleaned up the oil and kept looking for where the leak was coming from. It wasn't until I actually started the car and then got back underneath that I realized the oil was coming from somewhere above the flat, round oil plug (see the first pic below). I traced the leak up to the engine oil pressure sensor... Bingo! The factory witness mark showed that the sensor has backed off a quarter turn, causing the leak. (See the second picture below.)

    The good news is this should be a simple warranty item ( I just hit 2 years & 8,000 miles), and it will be easy to keep an eye on in the future, since you can see the sensor when you remove the driver's side front wheel. So, be sure to check your engine oil pressure sensor before your next time out on track.

    Drip.jpg Witness.jpg
     
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  2. ArizonaBOSS

    ArizonaBOSS Because racecar. Moderator

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    Harmonics. Good eye.
     
  3. VoodooBoss

    VoodooBoss Rick Moderator

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  4. steveespo

    steveespo Lord knows I'm a Voodoo Child Moderator

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    <iframe width="854" height="480" src="" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
     
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  5. SVTMatt

    SVTMatt TMO Intermediate

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    Thanks for the info @THX 138 , I just ran into the same scenario. Getting scheduled to get it fixed now. Anything additional learned after the fix?
     
  6. Grant 302

    Grant 302 OPM Spent: $509,979 Moderator

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    Check your oil sensors...

    Report of 3 loose leaking sensors at WSIR this weekend (one R and 2 350s). A fourth popped the engine...didn't hear the cause yet.

    IMG_1597.jpg
     
  7. ArizonaBOSS

    ArizonaBOSS Because racecar. Moderator

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  8. VoodooBoss

    VoodooBoss Rick Moderator

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    YIKES YIKES (that's double yikes)
     
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  9. Grant 302

    Grant 302 OPM Spent: $509,979 Moderator

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    Kinda worse than YIKES for me. Confidence in the shakedown runs would be really low. Two of those were my friends' cars and one of them has had several track days on it already over the last couple of years. Not sure why it would shake loose now.
     
  10. Mad302

    Mad302 TMO Race

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    Time to go out and check mine. 1100 miles
     
  11. TMSBOSS

    TMSBOSS TMO Addict

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    I have never used it....but.
    Can a locktite product be used as a thread locker and sealer?
     
  12. 11GT50

    11GT50 TMO Intermediate

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  13. TMSBOSS

    TMSBOSS TMO Addict

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    Nice. A little carb cleaner on the threads before applying and it should work.
     
  14. Creedog

    Creedog TMO Intermediate

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    How well has it worked? Any concerns/issues after using it? Can you pick it up at any main auto parts store or have to order it online?
     
  15. TymeSlayer

    TymeSlayer Tramps like us, Baby we were born to run...

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    You can use Loctite 567 High Temp Thread Sealant. It prevents leakage and loosening from shock and vibration.

    (Nothing against Permatex but they are second Banana)
     
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  16. racer47

    racer47 All I got left is fast

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    Good info, I didn't know that existed but I will use it now.


    I agree that Loctite used to be king, but since they now own Permatex, the products are likely to be more similar than different.

    https://www.permatex.com/announcement/1972-2/
    The Permatex Company has a New Owner

    Posted on: January 19th, 2016
    The Permatex Company was sold to Loctite Corporation. The business was moved to Cleveland, Ohio and integrated with the Woodhill Chemical Company. In the late 1970’s, Woodhill Permatex launched Permatex® Blue Silicone which went on to become the largest selling blister carded chemical item in the American auto parts business.
     
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  17. TMSBOSS

    TMSBOSS TMO Addict

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    I keep learnin and learnin.
     
  18. 11GT50

    11GT50 TMO Intermediate

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    It seems to be working well but I haven't inspected it in a while and have only had one track day since the repair. I initially found the leak because I could smell oil when I got out of the car. The twisted wires were the only thing that prevented the sensor from screwing completely out and I found oil dripping off the back of the belly pan.

    I could not find it in any of the local parts stores and ended up ordering it through Amazon.
     
    Last edited: Nov 1, 2018
  19. VoodooStang

    VoodooStang TMO Intermediate

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    Thanks for the post on the oil pressure sender. Discovered that mine was finger tight.
     
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  20. Grant 302

    Grant 302 OPM Spent: $509,979 Moderator

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    Better now than later. I'd suggest checking everything. Another 350 owner found a leak in one of the cooler lines.
     

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