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Complicated Isx Cummins jake solenoid question

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by unapez, Mar 6, 2018.

  1. Mar 6, 2018 #1
    unapez

    unapez Bobtail Member

    31
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    Jan 18, 2017
    0
    I have a cm870 cummins isx. Jake's don't work. I have verified the dash switches are working using insite. Wiring to solenoids is working.

    When the truck increases in rpm, it sounds like I have a miss or possibly one stage of the jake is coming in slowly. At idle there is no miss...

    My question is this... If the jake solenoid is leaking oil past the seal inside, at idle there is 18psi oil pressure. However the oil leaking past would increase in pressure with rpm, slowly / partially activating the jake correct?

    I bought two solenoids and plan to change them out. Just wondering if my theory is correct?
     
    unapez, Mar 6, 2018
    unapez, Mar 6, 2018
    #1
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  3. Mar 6, 2018 #2
    unapez

    unapez Bobtail Member

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    Jan 18, 2017
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    This noise / miss is happening all the time, with jake switch off.
     
    unapez, Mar 6, 2018
    unapez, Mar 6, 2018
    #2
  4. Mar 6, 2018 #3
    spsauerland

    spsauerland Road Train Member

    4,296
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    May 31, 2010
    West Harrison, In
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    They make a tune-up kit for the ISX interbrake, but I usually find the detent plungers and detent holes in rocker shaft oblong and snap ring retainer grooves wore out in rocker. Makes for a noisy/ tick topend.
     
    spsauerland, Mar 6, 2018
    spsauerland, Mar 6, 2018
    #3
    SAR Thanks this.
  5. Mar 13, 2018 #4
    unapez

    unapez Bobtail Member

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    Jan 18, 2017
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    Replaced my solenoids, Jake's are now functional.
     
    unapez, Mar 13, 2018
    unapez, Mar 13, 2018
    #4
    Tug Toy and spsauerland Thank this.
  7. Mar 24, 2025 #5
    RoadRanger^^

    RoadRanger^^ Light Load Member

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    Apr 17, 2018
    Columbus, OH
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    Would you be able to tell me where is the brake jake solenoid located on cummins isx 15 ?

    thank yoj
     
    RoadRanger^^, Mar 24, 2025
    RoadRanger^^, Mar 24, 2025
    #5
  8. Mar 24, 2025 #6
    Inderjit

    Inderjit Heavy Load Member

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    Sep 17, 2017
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    They are under the valve cover.
     
    Inderjit, Mar 24, 2025
    Inderjit, Mar 24, 2025
    #6
    RoadRanger^^ Thanks this.
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