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Broken rocker arm and bad injector

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Manfrmbklyn23, Mar 12, 2015.

  1. Mar 12, 2015 #1
    Manfrmbklyn23

    Manfrmbklyn23 Bobtail Member

    28
    2
    Mar 2, 2012
    Brooklyn, NY
    0
    04 international 9200i. Doing 65 on the NJTP when I could feel something wrong. Get off the road and go straight to a shop. They diagnose my # 6 injector went bad but, when they opened it they found a rocker arm tip cracked off. All is repaired and running well now but would any of you know how or why the rocket arm cracked? Is it tied into the injector? Perhaps because I kept driving to the shop? I attached a pic as well.
     

    Attached Files:

    Manfrmbklyn23, Mar 12, 2015
    Manfrmbklyn23, Mar 12, 2015
    #1
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  3. Mar 12, 2015 #2
    blanco

    blanco Road Train Member

    1,221
    296
    Nov 20, 2009
    Gwinnett County, GA
    0
    how many miles on the truck? could be metal fatigue caused it to crack and break. then cause a misfire on #6 injector.

    you did good in bringing it to the shop in a timely manner.
     
    blanco, Mar 12, 2015
    blanco, Mar 12, 2015
    #2
  4. Mar 12, 2015 #3
    Manfrmbklyn23

    Manfrmbklyn23 Bobtail Member

    28
    2
    Mar 2, 2012
    Brooklyn, NY
    0
    835,000 miles, it has a cat C15 that was rebuilt at 700,000. Truck runs really well and this has been the only engine issue so far. Thanks for replying.
     
    Manfrmbklyn23, Mar 12, 2015
    Manfrmbklyn23, Mar 12, 2015
    #3
  5. Mar 13, 2015 #4
    uvulabruzr

    uvulabruzr Bobtail Member

    36
    13
    Nov 1, 2014
    CANADA...EH
    0
    fairly common......
     
    uvulabruzr, Mar 13, 2015
    uvulabruzr, Mar 13, 2015
    #4
  7. Mar 13, 2015 #5
    sshewins

    sshewins Road Train Member

    1,631
    4,730
    Aug 21, 2011
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    When was the last time you ran the overhead?
     
    sshewins, Mar 13, 2015
    sshewins, Mar 13, 2015
    #5
    rollin coal Thanks this.
  8. Mar 13, 2015 #6
    rollin coal

    rollin coal Road Train Member

    13,083
    25,863
    Mar 29, 2008
    TN
    0
    If the overhead adjustment isn't set periodically the valve train tightens up and rocker arms will break. I have mine set every 100,000 which is a tad overkill but I think of it as preventative maintainence not only does it need to be adjusted but the valve train also needs visually inspecting. Preferable if you aren't doing it yourself to have the same mechanic set it every time.
     
    rollin coal, Mar 13, 2015
    rollin coal, Mar 13, 2015
    #6
  9. Mar 13, 2015 #7
    maggard359

    maggard359 Medium Load Member

    476
    413
    Nov 20, 2013
    Florida
    0
    Your injector plunger stuck and broke the rocker in my opinion, either from heat or it came apart internally. The cam lobe raises rocker up and down onto spring plunger of injector, if injector failed something had to give and it happened to be the rocker. You lucky it stayed intact and didn't make it's way to the crank, it would have made a big hole.
     
    maggard359, Mar 13, 2015
    maggard359, Mar 13, 2015
    #7
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