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valvetrain noise?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 05379, Oct 5, 2011.

Page 1 of 2
  1. Oct 5, 2011 #1
    05379

    05379 Light Load Member

    115
    3
    Nov 15, 2008
    montague ma
    0
    i hope i can get some ideas of what is going on i have a 05 pete tri axle dump with a mxs acert last overhead run at 20'000 miles by pete dealer i have a valvetrain noise and a half of a skip i would call it. one cylinder is not happy theres a nock at idle it is coming from one of the two rear cyl's it will nock at idle but go away if your just free wheeling as soon as you get back on fuel it starts again i can make it come and go with throttle i removed valve covers today can't find any broken parts but can't see that well back there either i'm thinking a vva maybe? thanks shawn.
     
    05379, Oct 5, 2011
    05379, Oct 5, 2011
    #1
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  3. Oct 6, 2011 #2
    AUSSIE DAVE

    AUSSIE DAVE Road Train Member

    1,032
    176
    Feb 21, 2010
    OZ - Brisbane
    0
    I would put my money on that the overheads was set incorrectly or they didnt tighten up correctly and the adjustment has changed.
     
    AUSSIE DAVE, Oct 6, 2011
    AUSSIE DAVE, Oct 6, 2011
    #2
  4. Oct 6, 2011 #3
    rollinsmoke10

    rollinsmoke10 Bobtail Member

    26
    1
    Oct 11, 2009
    0
    broken rocker shaft.
     
    rollinsmoke10, Oct 6, 2011
    rollinsmoke10, Oct 6, 2011
    #3
  5. Oct 6, 2011 #4
    power freak

    power freak Light Load Member

    220
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    Apr 23, 2009
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    Check for broken rocker shaft bolts. You can't tell if they are broke unless you pull the vva head. It is very common on those and they have updated bolts to cure this issue.
     
    power freak, Oct 6, 2011
    power freak, Oct 6, 2011
    #4
  7. Oct 6, 2011 #5
    Shade Tree

    Shade Tree Light Load Member

    177
    44
    May 15, 2011
    Galloway Ohio
    0
    If it is that noisy don't take any chances it can destroy CAM. Put your ear on the valve covers and identify which set of cylinders, and pull valve cover to make sure an adjusting screw didn't come loose or break.
     
    Shade Tree, Oct 6, 2011
    Shade Tree, Oct 6, 2011
    #5
  8. Oct 6, 2011 #6
    Heavyd

    Heavyd Road Train Member

    7,814
    6,267
    Feb 4, 2009
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    Isn't this the series with breaking jake housing studs?
     
    Heavyd, Oct 6, 2011
    Heavyd, Oct 6, 2011
    #6
  9. Oct 6, 2011 #7
    05379

    05379 Light Load Member

    115
    3
    Nov 15, 2008
    montague ma
    0
    i did yesterday used a long screw driver like the ole farmers do lol it's coming from the rear two
     
    05379, Oct 6, 2011
    05379, Oct 6, 2011
    #7
  10. Oct 6, 2011 #8
    05379

    05379 Light Load Member

    115
    3
    Nov 15, 2008
    montague ma
    0
    this could be but why would it make noise then not make noise with no load? thank you for the help guy's i'm pullin my hair out!
     
    05379, Oct 6, 2011
    05379, Oct 6, 2011
    #8
  11. Oct 6, 2011 #9
    07-379Pete

    07-379Pete Crusty Commando-Pete

    2,549
    2,347
    Oct 3, 2008
    Campbellsville, Ky
    0
    I had a problem like that a couple months ago. Only made a noise when I was making it pull, nothin going down hill or just coasting. Turned out it was a nut from the cat brake came out and was riding on the rocker arms.
    But if your the first owner and never had a problem with the hold down bolts I would bet thats your problem.
     
    07-379Pete, Oct 6, 2011
    07-379Pete, Oct 6, 2011
    #9
  12. Oct 7, 2011 #10
    Shade Tree

    Shade Tree Light Load Member

    177
    44
    May 15, 2011
    Galloway Ohio
    0
    The injector has a spring under the plunger that I have seen break and cause the same noise. Visually look at the spring on the injector to see if one has broken. It will cause all of your symptoms.
     
    Shade Tree, Oct 7, 2011
    Shade Tree, Oct 7, 2011
    #10
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