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Cummins Jake Shake

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Castorized, Aug 26, 2020.

  1. Aug 26, 2020 #1
    Castorized

    Castorized Bobtail Member

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    Aug 26, 2020
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    (Please bump to appropriate thread If this One isn’t applicable)

    2013 ISX 3 550 cm2350 20265 hrs
    Hey guys n gals. I’m searching for some opinions or “I know the problem“
    Recently I’ve been experiencing A respectable shake under engine braking. It noticeably starts around 1600 RPM. All the way down to 1200. When my manifold pressure climbs up above 25psi and oil temp is 230-240, loaded or not.
    If I get my oil cool down to 220 or less, it almost disappears.
    I’ve got three stages for the jake and can feel it high and medium setting.
    Any suggestions or insight would be appreciated.
    Thx much
     
    Castorized, Aug 26, 2020
    Castorized, Aug 26, 2020
    #1
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  3. Aug 27, 2020 #2
    pushbroom

    pushbroom Road Train Member

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    There is an update to the ecm to reduce engine brake vibration. If that doesnt work you will need to replace all 6 jake brake rocker arms.
     
    pushbroom, Aug 27, 2020
    pushbroom, Aug 27, 2020
    #2
    650cat425, BoxCarKidd and spsauerland Thank this.
  4. Sep 9, 2020 #3
    Castorized

    Castorized Bobtail Member

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    Aug 26, 2020
    0
    I actually ended up poppin the cover off the other day, found 2 jake rockers with sooo much play on the shafts... betcha 50$ ya couldn’t build enough pressure with molasses to keep them from ratteling
     
    Castorized, Sep 9, 2020
    Castorized, Sep 9, 2020
    #3
  5. Sep 9, 2020 #4
    Goodysnap

    Goodysnap Road Train Member

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    Really? This isnt normally a spot you would find excessive play. What did you end up replacing? Were the valve rockers worn just as bad? If the top end recieves the same oil flow they should be all worn the same.

    I would make sure to follow the rocker installations procedure and checking end gaps while torqued.

    Thanks for updating with your fix.
     
    Goodysnap, Sep 9, 2020
    Goodysnap, Sep 9, 2020
    #4
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