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Speed sensor thread

Discussion in 'Peterbilt Forum' started by Veeg378, Sep 22, 2017.

  1. Sep 22, 2017 #1
    Veeg378

    Veeg378 Bobtail Member

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    My tach has never worked since I owned the truck, come to find out, the sensor is missing from the bell housing. I tried to install a sensor but it turned in extremely difficult. Tried cleaning the threads with a wire brush with no luck. Does anyone know what thread size the sensor is so I can get a tap to run through it. Thanks!!
     
    Last edited: Sep 23, 2017
    Veeg378, Sep 22, 2017
    Veeg378, Sep 22, 2017
    #1
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  3. Sep 23, 2017 #2
    baha

    baha Road Train Member

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    If its a later model truck they had plastic sensor that push in and have a bolt hole a 1/2 in. away from hole where sensor goes in tail shaft, if its that type you have to dig out the broken part of sensor to get new one to slide in hole
     
    baha, Sep 23, 2017
    baha, Sep 23, 2017
    #2
  4. Sep 23, 2017 #3
    AModelCat

    AModelCat Road Train Member

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    Take sensor to tool store and match it up?
     
    AModelCat, Sep 23, 2017
    AModelCat, Sep 23, 2017
    #3
  5. Sep 23, 2017 #4
    Veeg378

    Veeg378 Bobtail Member

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    The TACH speed sensor does NOT go in the tail shaft, it goes in the bell housing and there are threads. I was wondering if anyone knows what size thread it is so I can get a tap to clean the threads. So why are you replying about a push in sensor?
     
    Veeg378, Sep 23, 2017
    Veeg378, Sep 23, 2017
    #4
  7. Sep 23, 2017 #5
    Veeg378

    Veeg378 Bobtail Member

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    Yes I am aware of this but the truck and sensor are in a different location then I. I’m looking for a fraction and a thread pitch number, that’s it.
     
    Veeg378, Sep 23, 2017
    Veeg378, Sep 23, 2017
    #5
  8. Sep 23, 2017 #6
    AModelCat

    AModelCat Road Train Member

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    Well it would certainly assist us folks if you were to provide the engine make/model at least.
     
    AModelCat, Sep 23, 2017
    AModelCat, Sep 23, 2017
    #6
  9. Sep 23, 2017 #7
    baha

    baha Road Train Member

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    - it was late when i got in an put tail shaft but I will try to find a old rpm sensor an ck pitch of them?
     
    Last edited: Sep 23, 2017
    baha, Sep 23, 2017
    baha, Sep 23, 2017
    #7
  10. Sep 25, 2017 #8
    Veeg378

    Veeg378 Bobtail Member

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    For anyone looking or having the same issue. The threads on a bell housing for a tach speed sensor are 3/4-16. Thanks to all of those that responded.
     
    Veeg378, Sep 25, 2017
    Veeg378, Sep 25, 2017
    #8
    blairandgretchen and QUALITYTRUCK Thank this.
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