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JAKE BRAKE POPS LOUDER THAN NORMAL

Discussion in 'Trucks [ Eighteen Wheelers ]' started by bigstank, Jan 20, 2016.

  1. Jan 20, 2016 #1
    bigstank

    bigstank Light Load Member

    87
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    Mar 4, 2013
    missouri
    0
    Hey guys need some help here. I got an 03 379 with a 6nz cat. I rebuilt the motor a year ago and i didnt change the cam cause it looked fine. SoI just had to replace the camshaft and rockers including the injector rockers. Now the problem I have is the Jakes pop alot louder on these 8" straights and I seem to have a vibration only when the Jakes are on. Is it just cause everything is new and tight? Also here is a picture of why I had to replace the camshaft with a stock reman. Thanks for your info guys!
     

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    bigstank, Jan 20, 2016
    bigstank, Jan 20, 2016
    #1
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  3. Jan 20, 2016 #2
    pup

    pup Light Load Member

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    Dec 3, 2011
    n.h.
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    I don't have a lot of experience troubleshooting Caterpillar engine brakes but a Cummins can show the same behavior. A cracked slave piston adjusting screw or the lash setting excessive can cause this. Can you narrow it down to which engine brake position by using the dash switch?
     
    pup, Jan 20, 2016
    pup, Jan 20, 2016
    #2
    bigstank Thanks this.
  4. Jan 20, 2016 #3
    Superhauler

    Superhauler TEACHER OF MEN

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    keep stroking.
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    Two things come to mind. Adjustment and something in one of the jake housings is wrong. You can get a (tune up) kit for the jake and you don't have to take them off to do it.
     
    Superhauler, Jan 20, 2016
    Superhauler, Jan 20, 2016
    #3
    bigstank, wore out and SAR Thank this.
  5. Jan 21, 2016 #4
    bigstank

    bigstank Light Load Member

    87
    19
    Mar 4, 2013
    missouri
    0
    Yeah idk it's probably just the the overhead being new. I'm gonna rerun the rack probably next week and see. I had the jake packs rebuilt with all new springs ect.
     
    bigstank, Jan 21, 2016
    bigstank, Jan 21, 2016
    #4
  7. Jan 21, 2016 #5
    mhyn

    mhyn Road Train Member

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    Dec 29, 2008
    Northridge, CA
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    I just want to add this. when you change the springs from that kit also pull out pistons and mark them. you may see scratches on pistons and inside of the housing. polish these surfaces slightly and put back pistons as marked.
     
    mhyn, Jan 21, 2016
    mhyn, Jan 21, 2016
    #5
    bigstank Thanks this.
  8. Jan 21, 2016 #6
    bigstank

    bigstank Light Load Member

    87
    19
    Mar 4, 2013
    missouri
    0
    Yep, it was done correctly
     
    bigstank, Jan 21, 2016
    bigstank, Jan 21, 2016
    #6
  9. Jan 21, 2016 #7
    strollinruss

    strollinruss Road Train Member

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    Jun 5, 2012
    Montgomery, TX
    0
    Ya didn't clean your ears lately, huh? Jakes can get out of adjustment and they probably working right now for first time in a while. Be my bet.
     
    strollinruss, Jan 21, 2016
    strollinruss, Jan 21, 2016
    #7
    bigstank Thanks this.
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