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help a c15 intake rocker arms keep breaking

Discussion in 'Freightliner Forum' started by lashbrooksl, Oct 27, 2012.

  1. Oct 27, 2012 #1
    lashbrooksl

    lashbrooksl Bobtail Member

    2
    0
    Oct 27, 2012
    0
    I would appreciate any help with an explanation as to why the intake rocker arms keep breaking. I replace one and then a different one breaks and so on.
     
    lashbrooksl, Oct 27, 2012
    lashbrooksl, Oct 27, 2012
    #1
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  3. Oct 27, 2012 #2
    Chain Drive

    Chain Drive Medium Load Member

    436
    113
    Nov 28, 2008
    Nova Scotia,Canada
    0
    pulling up around 1700 1800 and letting off the fuel allowing the jake to come on,
     
    Chain Drive, Oct 27, 2012
    Chain Drive, Oct 27, 2012
    #2
  4. Oct 27, 2012 #3
    CondoCruiser

    CondoCruiser The Legend

    19,726
    18,734
    Apr 18, 2010
    Tennessee
    0
    Have you had the head rebuilt or the cam changed? It could be a pushrod/valve clearance issue on the intake side.

    Another thing is the valve guides could be sticky or oval shaped making the rocker hit off center.

    Any other signs of damage?
     
    CondoCruiser, Oct 27, 2012
    CondoCruiser, Oct 27, 2012
    #3
  5. Nov 4, 2012 #4
    lashbrooksl

    lashbrooksl Bobtail Member

    2
    0
    Oct 27, 2012
    0
    I replaced the head from a different engine. It will start up and run good for a few minutes then the intake rocker arms will start to break. what is causing this. There is no other damage.
     
    lashbrooksl, Nov 4, 2012
    lashbrooksl, Nov 4, 2012
    #4
  7. Nov 4, 2012 #5
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    replace valve, valve liner and valve SPRING, yep, weak valve spring is the problem at high engine speed
     
    Pablo-UA, Nov 4, 2012
    Pablo-UA, Nov 4, 2012
    #5
  8. Nov 11, 2012 #6
    carrkool

    carrkool Heavy Load Member

    883
    495
    May 10, 2012
    adah, pa
    0
    replace the all with new ones. a common c15 issue. i think they even have a recall on them....replace the studs and all.
     
    carrkool, Nov 11, 2012
    carrkool, Nov 11, 2012
    #6
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