Installing a pyrometer

Discussion in 'Trucks [ Eighteen Wheelers ]' started by CbarM, Aug 13, 2013.

  1. CbarM

    CbarM Heavy Load Member

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    Jan 17, 2011
    Irvine, AB
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    I have a '98 FLD120 w/3406E n I want to put a pyrometer in. Do I have to use a freightliner wiring harness or will anything work? I have a probe (sending unit) from an international n was hoping that might work. There is 2 wires comin out of it n I assume 1 goes to a gauge n the other to a power source?
     
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  3. D389

    D389 Light Load Member

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    Mar 24, 2013
    Texas Panhandle
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    The sender you have should work. Both of those wires go to the gauge. All you need is the wire going from the sender to the gauge and a mechanical pyrometer.
     
  4. CbarM

    CbarM Heavy Load Member

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    Jan 17, 2011
    Irvine, AB
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    How does the gauge get power? I dont fully understand...
     
  5. billandlori

    billandlori Medium Load Member

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    Sep 5, 2010
    Stratford, Ontario, Canada
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    I put in an Autometer pyro and they say you have to use the wire harness just the way it comes, you can not cut it to length. Not sure how the factory pyro's work but I would think they would be similar.

    Bill
     
  6. Ridgeline

    Ridgeline Road Train Member

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    Dec 18, 2011
    Michigan
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    The gauge doesn't need power, the probe (most likely a K type thermocouple) creates the voltage for the gauge.

    When you install it, you will have to drill and tap the hole in the exhaust manifold (if it is before the turbo, be careful not to get the metal chips into the manifold), then you can install it in the manifold.

    The problem with trucks is that most likely you will need to extend the probe's wiring which is not done with anything but thermocouple wire and you have to put the right lugs on the ends then connect them with a nut and bolt to get accurate readings.

    Hope that helps.
     
  7. CbarM

    CbarM Heavy Load Member

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    Jan 17, 2011
    Irvine, AB
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    Ohhh...so its not just a matter of crimpin on a couple butt connectors to make it longer?
     
  8. D389

    D389 Light Load Member

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    Mar 24, 2013
    Texas Panhandle
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    No, you have to buy it in pre cut lengths. I forget what its made of but cutting it will alter the readings you get on the gauge. I don't think regular copper wire will work.
     
  9. Ridgeline

    Ridgeline Road Train Member

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    The connectors do matter too, you can order it in any length but there is a limit to it.
     
  10. Blind Driver

    Blind Driver Road Train Member

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    Aug 7, 2006
    New Albany, IN
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    Do not use butt connectors. They will alter the reading.

    Buy a Autometer gauge from Summit Racing. Instructions will be included ;)
     
  11. cetanediesel

    cetanediesel Medium Load Member

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    Mar 26, 2013
    Albany, NY
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    You could just install it the way 4 billion other trucks have it, in the exhaust elbow right after the turbo. Its a $100 elbow from the dealer if you dont have a 3/8 bung already there.
     
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