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ISX weak/rough jake

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Rig Wrench, Jun 1, 2014.

  1. Jun 1, 2014 #1
    Rig Wrench

    Rig Wrench Medium Load Member

    398
    66
    Dec 24, 2010
    northeast
    0
    06 ISX jake is very weak (and some what rough) on the first and second stages, the third stage (turbo) seems to work fine. I've put new solenoids, springs, pistons and harness on the jakes. The jake cam appears fine. Oil pressure is excellent. I've narrowed it down to possibly rocker shafts/ rockers or possibly cam bearings? Everything appears to look fine to the naked eye, not enough wear to see anyway. I have another ISX that I seldom ever needs the third stage of the jake it works soo good.
    Thanks for any help
     
    Rig Wrench, Jun 1, 2014
    Rig Wrench, Jun 1, 2014
    #1
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  3. Jun 2, 2014 #2
    truckmechanic

    truckmechanic Medium Load Member

    534
    140
    Jan 14, 2012
    Hi Desert Ca
    0
    need to check the adjustment but make sure not to half ### it make sure to check the running clearance as well let me dig up the specs. also check it with the valve cover off by depressing the button on top of the selinoid to make sure all is working and it is not a switch problem.
     
    truckmechanic, Jun 2, 2014
    truckmechanic, Jun 2, 2014
    #2
  4. Jun 2, 2014 #3
    Rig Wrench

    Rig Wrench Medium Load Member

    398
    66
    Dec 24, 2010
    northeast
    0
    I've run the overhead as to cummins spec.
     
    Rig Wrench, Jun 2, 2014
    Rig Wrench, Jun 2, 2014
    #3
  5. Jun 3, 2014 #4
    Sportster2000

    Sportster2000 Road Train Member

    1,480
    886
    Jan 5, 2008
    Indiana
    0
    Valves, injectors, and engine brakes (if equipped) must be correctly adjusted for the engine to operate efficiently. Valve, injector, and engine brake adjustment must be performed using the values listed in this section.
    After an engine rebuild or any major repair where the injector and valve setting must be disturbed, set all of the valves, injectors, and brakes.
    [TABLE="class: pubs_datatable"]
    [TR]
    [TD] Valve, Brake, and Injector Adjustment Values[/TD]
    [/TR]
    [TR]
    [TD] Injector Adjustment is 8 N•m [70 in-lb][/TD]
    [/TR]
    [TR]
    [TD] Intake Valve[/TD]
    [TD] 0.35 mm [0.014 in][/TD]
    [/TR]
    [TR]
    [TD] Exhaust Valve[/TD]
    [TD] 0.68 mm [0.027 in][/TD]
    [/TR]
    [TR]
    [TD] Engine Brake[/TD]
    [TD] 7.00 mm [0.276 in[/TD]
    [/TR]
    [/TABLE]

    Straight from quick serve for specs. I know that you probably don't need these but it is just for you to double check.
     
    Sportster2000, Jun 3, 2014
    Sportster2000, Jun 3, 2014
    #4
  7. Jun 7, 2014 #5
    kwcam

    kwcam Light Load Member

    193
    145
    Dec 29, 2012
    at the shop
    0
    should have replaced the rocker shaft, the detent holes wear oval and won't hold pressure causing weak jakes.
    we do a "jake tune up" of replacing both shafts, control spools and springs and it brings jake performance back to new.
     
    kwcam, Jun 7, 2014
    kwcam, Jun 7, 2014
    #5
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