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Violent Shake When Using Engine Brake

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by hawkjr, Jul 31, 2018.

  1. Jul 31, 2018 #1
    hawkjr

    hawkjr Road Train Member

    1,652
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    Feb 28, 2010
    Virginia
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    I get a real bad shake when my Jake's engage within the first 5 seconds or so...I can disengage and reenage and it's fine for the first 3-5 seconds then it goes back to the shaking.. Anybody got a clue? The truck is a 2014 T660 with a Cummins
     
    hawkjr, Jul 31, 2018
    hawkjr, Jul 31, 2018
    #1
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  3. Jul 31, 2018 #2
    line

    line Medium Load Member

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    Dec 28, 2017
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    I had a Cummins also , the oil runs high temp. Like sixty degrees over a Cat. If you’re using thin oil like a 40 weight synthetic it’ll wear out the parts faster . Plus I always had problems after over heads . Is it a two stage or three .? Does it shake the same in all stages ? Pull the valve cover off and run the jakes manually . You likely have a few bad jake rockers or oil leaking into your solenoids . Run thicker oil and use an additive like MotorKote
     
    line, Jul 31, 2018
    line, Jul 31, 2018
    #2
  4. Jul 31, 2018 #3
    hawkjr

    hawkjr Road Train Member

    1,652
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    Feb 28, 2010
    Virginia
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    All 3... It seems when the truck is cold it doesn't do it until it warms up so that could be it
     
    hawkjr, Jul 31, 2018
    hawkjr, Jul 31, 2018
    #3
    line Thanks this.
  5. Jul 31, 2018 #4
    Ridgeline

    Ridgeline Road Train Member

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    Dec 18, 2011
    Michigan
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    Run it into the shop and have them do an overhead and check out the system.
     
    Ridgeline, Jul 31, 2018
    Ridgeline, Jul 31, 2018
    #4
    hawkjr and line Thank this.
  7. Jul 31, 2018 #5
    line

    line Medium Load Member

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    Dec 28, 2017
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    Aye . Especially in warm weather when the oil thins . Use a fifty weight and motorkote, You’ll notice a big difference even in your fuel mileage
     
    line, Jul 31, 2018
    line, Jul 31, 2018
    #5
    hawkjr Thanks this.
  8. May 18, 2020 #6
    Lone Wolf 0811

    Lone Wolf 0811 Bobtail Member

    3
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    Dec 5, 2019
    0
    What was the outcome??
     
    Lone Wolf 0811, May 18, 2020
    Lone Wolf 0811, May 18, 2020
    #6
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