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3406E jakes will not engage

Discussion in 'Trucks [ Eighteen Wheelers ]' started by The Big Dodge, Oct 7, 2013.

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  1. Oct 7, 2013 #1
    The Big Dodge

    The Big Dodge Bobtail Member

    7
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    Oct 7, 2013
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    I have a 3406E that I can see the center of the Jake solenoids engage but there is no engine braking. I was hoping some one has an Idea as to what could be going on, or anything i could check.

    Thanks in advance.
     
    The Big Dodge, Oct 7, 2013
    The Big Dodge, Oct 7, 2013
    #1
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  3. Oct 7, 2013 #2
    hoss699

    hoss699 Bobtail Member

    19
    9
    Oct 5, 2013
    Midland. Tx
    0
    The simple thing to check is that your switch is good. I've had them go bad a couple of times thru the years. Also make sure that you have good engine oil pressure.
     
    hoss699, Oct 7, 2013
    hoss699, Oct 7, 2013
    #2
  4. Oct 7, 2013 #3
    The Big Dodge

    The Big Dodge Bobtail Member

    7
    0
    Oct 7, 2013
    0
    70 Psi of oil on the gauge and i am getting voltage to the ecm from the switch. Cruise works as well what has me stumped is that the little plunger in the center of the solenoid will go in when the throttle is released but the jakes do no engage. Is there an other wires that i should check?

    thanks for the thought though
     
    The Big Dodge, Oct 7, 2013
    The Big Dodge, Oct 7, 2013
    #3
  5. Oct 7, 2013 #4
    Superhauler

    Superhauler TEACHER OF MEN

    12,209
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    Jan 30, 2010
    keep stroking.
    0
    did you recently have the rocker assembly's off? if so you may have installed the wrong hold down bolts in the wrong holes. the third bolt back on each jake assembly has a narrower shaft to let the oil supply get to the jakes .
     
    Superhauler, Oct 7, 2013
    Superhauler, Oct 7, 2013
    #4
  7. Oct 8, 2013 #5
    The Big Dodge

    The Big Dodge Bobtail Member

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    Oct 7, 2013
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    All the bolts in this engine are necked down to what appears to be the same size.
     
    The Big Dodge, Oct 8, 2013
    The Big Dodge, Oct 8, 2013
    #5
  8. Oct 8, 2013 #6
    Superhauler

    Superhauler TEACHER OF MEN

    12,209
    100,730
    Jan 30, 2010
    keep stroking.
    0
    ok then you have the 12 point heads on all of them.
     
    Superhauler, Oct 8, 2013
    Superhauler, Oct 8, 2013
    #6
  9. Oct 8, 2013 #7
    The Big Dodge

    The Big Dodge Bobtail Member

    7
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    Oct 7, 2013
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    Yes all are 12 point heads. could all 3 solenoids be bad? I recently replaced the injector cups as there was fuel in the coolant. got it all put back together and no jake brake.
     
    The Big Dodge, Oct 8, 2013
    The Big Dodge, Oct 8, 2013
    #7
  10. Oct 8, 2013 #8
    JohnP3

    JohnP3 Road Train Member

    1,594
    683
    Feb 21, 2010
    Rock Creek B.C. Canada
    0
    With the engine running push down on the solenoid center manually and look for oil leakage, there should no leakage until you release it then you want to have a rag over the head, The shop I worked at had a Jake head oil preasure guage. You remove the solenoid, then it screws into the solenoid In 20 years I think I used it once. Be sure you are getting oil preasure to the rocker arms, The next thing to check is the seal rings, on the solenoids, then the spool valves and the ball valve spring.
    Just a thought!
     
    JohnP3, Oct 8, 2013
    JohnP3, Oct 8, 2013
    #8
  11. Oct 8, 2013 #9
    The Big Dodge

    The Big Dodge Bobtail Member

    7
    0
    Oct 7, 2013
    0
    I have lots of oil to the rockers. If i push down on the center of the solenoid i have a very small amount of oil out of the top and i mean very small.
     
    The Big Dodge, Oct 8, 2013
    The Big Dodge, Oct 8, 2013
    #9
  12. Oct 8, 2013 #10
    The Big Dodge

    The Big Dodge Bobtail Member

    7
    0
    Oct 7, 2013
    0
    i am also getting code 34, 31, 36 when i flash the codes. My ET has the wrong plug for this truck to look at any parameters.
     
    The Big Dodge, Oct 8, 2013
    The Big Dodge, Oct 8, 2013
    #10
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