Cat engine temp sensor

Discussion in 'Kenworth Forum' started by Lazer, Jun 4, 2021.

  1. Lazer

    Lazer Medium Load Member

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    Jan 22, 2017
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    Got a 1995 T800 w/3406. Engine temp sensor(switch) gone bad. No longer available(mechanical), have an electronic one from a different truck of same vintage, but Cummins engine. Having trouble locating a sensor that will fit, only need a 1 wire sensor.
     
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  3. w9l

    w9l Light Load Member

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    Oct 12, 2013
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    Are you talking about the alarm switch or the gauge sender
     
  4. Lazer

    Lazer Medium Load Member

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    Jan 22, 2017
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  5. w9l

    w9l Light Load Member

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    Oct 12, 2013
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    I replaced the electric gauge in my 93 so with a mechanical oem gauge from KW. Better resolution and more accurate. If the Cummins sensor fits hook it up and try it. The senders are Paccar not Cat as far as I know.
     
  6. Lazer

    Lazer Medium Load Member

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    Jan 22, 2017
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    I do have one used sender, but smaller thread size, I will try and locate a bushing to fit. The gauge I have has only 1’stub’ that you ‘push on a wire’ the other ‘stubs’ connect to the circuit board. If you know what I mean.
     
  7. w9l

    w9l Light Load Member

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    Oct 12, 2013
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    Yes, that is what I had also. I had to buy gauge and all as it is all one sealed unit. Gauge has a metal jacketed lead coming out of the back with a pipe fitting and bulb on the end , probably 10ft long that you have to fish through the firewall
    ..
     
  8. w9l

    w9l Light Load Member

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    Oct 12, 2013
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    Just happen to notice KW temp senders on ebay. A bunch of different ones. Many with pigtail. Oem part numbers on some. Most all under 20 bucks. Be sure and specify USA only under item location in filters
     
  9. Lazer

    Lazer Medium Load Member

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    Jan 22, 2017
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    Well to update, got a sending unit. 1/2” NPT. Fit perfectly, no leaks, hooked up the single electrical wire, and nothing. Gauge won’t move after at least 20 min. at 900 rpm. All the other gauges work on that cluster,( it’s the smaller cluster on the left, close to the drivers door). Checked wire, it’s plugged into the back of the gauge, plugged onto the sending unit.
    I tested the gauge by unplugging from the sensor, and touched the engine block with the wire, and the gauge immediately pegged past 230 degrees.
    I’m at a loss, how can I test this single wire sensor?
     
  10. Catmando

    Catmando Light Load Member

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    Mar 15, 2021
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    Run a ohms test on the sending unit it's self
     
  11. Lazer

    Lazer Medium Load Member

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    Jan 22, 2017
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    I don’t want sound like a knob, but I have never done an ohms test on anything. I do have one of those multi-function voltage testers.
     
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