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Paccar MX 13, makes weird noises.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Just.Do.It, Nov 3, 2019.

  1. Nov 3, 2019 #1
    Just.Do.It

    Just.Do.It Light Load Member

    55
    37
    Jul 23, 2018
    Tampa FL
    0
    Hello everyone! Title says it all, squealing noise coming from the engine when I use engine brake. Started around 3 months ago, getting worse. Peterbilt dealrship mechanics could not find anything. Link to youtube video is here -
     
    Just.Do.It, Nov 3, 2019
    Just.Do.It, Nov 3, 2019
    #1
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  3. Nov 3, 2019 #2
    Goodysnap

    Goodysnap Road Train Member

    3,502
    8,384
    Jul 12, 2017
    0
    I could not hear the specific noise from your video. You likely have an exhaust leak. Have the intake and exhaust system pressure tested or smoke tested to identify the leak.
     
    Goodysnap, Nov 3, 2019
    Goodysnap, Nov 3, 2019
    #2
    magoo68, pushbroom and Just.Do.It Thank this.
  4. Nov 5, 2019 #3
    FdEF

    FdEF Light Load Member

    70
    57
    Dec 5, 2017
    Ogden, Ut
    0
    Check the back pressure valve. Seem to be a common problem on EPA13
     
    FdEF, Nov 5, 2019
    FdEF, Nov 5, 2019
    #3
    Just.Do.It Thanks this.
  5. Nov 5, 2019 #4
    Just.Do.It

    Just.Do.It Light Load Member

    55
    37
    Jul 23, 2018
    Tampa FL
    0
    How do I check that thing? It moves a little while idling. Not sure what else it should do, and shouldn't do.
     
    Just.Do.It, Nov 5, 2019
    Just.Do.It, Nov 5, 2019
    #4
  7. Nov 14, 2019 #5
    FdEF

    FdEF Light Load Member

    70
    57
    Dec 5, 2017
    Ogden, Ut
    0
    bump your rpms up with the cruise. as soon as your fan kicks on it will move that back pressure valve and it will either stop making the noise or make it worse if its the BPV
     
    FdEF, Nov 14, 2019
    FdEF, Nov 14, 2019
    #5
    Just.Do.It Thanks this.
  8. Nov 14, 2019 #6
    Just.Do.It

    Just.Do.It Light Load Member

    55
    37
    Jul 23, 2018
    Tampa FL
    0
    Thank you, will do that
     
    Just.Do.It, Nov 14, 2019
    Just.Do.It, Nov 14, 2019
    #6
  9. Nov 14, 2019 #7
    Rounded_nut

    Rounded_nut Light Load Member

    92
    107
    Feb 25, 2018
    0
    Check for soot around the slip joints on the exhaust manifold as they leak, also egr valve and all the gaskets.
     
    Rounded_nut, Nov 14, 2019
    Rounded_nut, Nov 14, 2019
    #7
    spsauerland and Just.Do.It Thank this.
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