1996 Detroit 12.7 Air dryer/governor/compressor issue.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by nikmirbre, Dec 10, 2025.

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  1. Dec 11, 2025 #11
    nikmirbre

    nikmirbre Road Train Member

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    Exactly which line is that im pulling off the compressor?
     
    nikmirbre, Dec 11, 2025
    nikmirbre, Dec 11, 2025
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  3. Dec 11, 2025 #12
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    The small 1/4" plastic air line. Post a pic of your compressor if you need to.
     
    Big Road Skateboard, Dec 11, 2025
    Big Road Skateboard, Dec 11, 2025
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  4. Dec 11, 2025 #13
    nikmirbre

    nikmirbre Road Train Member

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    Yeah its posted above.......ok, so it'd be the only plastic line on the compressor then I believe. All the other lines are rubber or braided.
     
    nikmirbre, Dec 11, 2025
    nikmirbre, Dec 11, 2025
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  5. Dec 11, 2025 #14
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Yes, probably on the back of the compressor, you can see where a governor would bolt up there. The line between the bolt holes
     
    Big Road Skateboard, Dec 11, 2025
    Big Road Skateboard, Dec 11, 2025
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  7. Dec 11, 2025 #15
    nikmirbre

    nikmirbre Road Train Member

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    Ok, and pour rubbing alcohol down that line? truck running?
     
    nikmirbre, Dec 11, 2025
    nikmirbre, Dec 11, 2025
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  8. Dec 11, 2025 #16
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    No. Just see if you have air there when the dryer pops off, or when pressure gets to 120-125.

    That air line is the signal line to the unloader to keep the compressor from building air.
     
    Big Road Skateboard, Dec 11, 2025
    Big Road Skateboard, Dec 11, 2025
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  9. Dec 11, 2025 #17
    nikmirbre

    nikmirbre Road Train Member

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    Ok, should I have air going there after popping off?
     
    nikmirbre, Dec 11, 2025
    nikmirbre, Dec 11, 2025
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  10. Dec 11, 2025 #18
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Yes
     
    Big Road Skateboard, Dec 11, 2025
    Big Road Skateboard, Dec 11, 2025
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  11. Dec 11, 2025 #19
    nikmirbre

    nikmirbre Road Train Member

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    OK....BTW, on my governor there was no little bolt to loosen and turn the slotted screw. K025894 is the Bendix governor I have. There was a black knob type thing on the underside of the governor though..

    Im gonna do all of this in the morning......
     
    nikmirbre, Dec 11, 2025
    nikmirbre, Dec 11, 2025
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  12. Dec 11, 2025 #20
    nikmirbre

    nikmirbre Road Train Member

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    Ok. I appreciate your help!!!
     
    nikmirbre, Dec 11, 2025
    nikmirbre, Dec 11, 2025
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