High Oil Temp, Sensor Issue?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by RocketScott, Sep 19, 2021.

  1. RocketScott

    RocketScott Medium Load Member

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    Apr 10, 2013
    Tacoma, WA
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    I put a new temp sensor on my oil pan and the gauge seems to be reading higher than the actual oil temp

    Today I went and drove some hills. The gauge got up to 240 but checking the oil cooler, pan, and filter with an infrared thermometer showed nothing over 205. (I know it's going to be a little lower reading the outside of the pan or oil cooler but not that much). Water temp is around 150

    '89 Peterbilt 379, Newly rebuilt 444xt, replaced the oil cooler core this morning, oil thermostat was replaced during the rebuild

    Gauge looks to be original to the truck. Sensor is a cross reference match to the original Peterbilt part number
     
    blairandgretchen Thanks this.
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  3. dieselcustoms

    dieselcustoms Bobtail Member

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    Sep 20, 2021
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  4. dieselcustoms

    dieselcustoms Bobtail Member

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    Sep 20, 2021
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    So the gauge doesn't match the laser thermometer, how about the new sensor, it has the same connector as the one you had taken out. What was the reason for changing it out to begin with, a faulty or untrue information from the gauge or it had suffered damage somehow.
     
  5. dieselcustoms

    dieselcustoms Bobtail Member

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    Sep 20, 2021
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    ??, wires could be wrong or could simply ohm out different than the old one, what im getting at is if the old sensor is available try to check the resistance and make sure it the same. Whats the manufacturer of the gauge itself, quality gauges tend to have a pretty long life span. But everything has a lifespan
     
  6. blairandgretchen

    blairandgretchen Road Train Member

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    South west Missouri
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    Just my experience, but after changing water temp sensor, it reads higher - 200 - when the scan guage reads 180.

    I quizzed the mechanic as to whether he got the exact replacement - he says he did.

    The scan guage shows that the other guages aren’t perfect either - about 10% off
     
    RocketScott Thanks this.
  7. RocketScott

    RocketScott Medium Load Member

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    Apr 10, 2013
    Tacoma, WA
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    All the sensors got replaced when I rebuilt it. There's only one wire going to it, that got replaced a couple years ago when I completely rewired the engine

    I have the old one in a box somewhere, looking back on it I think it was probably reading high too. It would get up to 240 without much effort. The new sensor is from PAI. The original Peterbilt part was 17-01685, that got changed to 140401. Cross that to a PAI 730394

    I suppose I could switch the engine oil temp gauge with the trans or rear axle gauges to see if it's the gauge itself. I was just thinking maybe the new sensor and old gauge were not completely compatible, like the sensor was working on a different scale than the gauge

    [​IMG]
     
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