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Air Leak?

Discussion in 'Ask An Owner Operator' started by King, Aug 20, 2017.

  1. Aug 20, 2017 #1
    King

    King Bobtail Member

    15
    1
    Jul 11, 2012
    0
    I have a 2011 Kenworth T700. When I'm riding down the road I'm hearing a whistling noise like it may be a air leak but I do not know where it's coming from.I am not losing air pressure when I apply the brakes but after the truck sits for a while the primary air gauge indicates a loss of pressure.The high pitch whistling sounds like it's coming from inside the truck but you can hear it outside of the truck too.Anyone ever encountered this issue?It does not make the noise while idling and it's been doing it for about a month.
     
    King, Aug 20, 2017
    King, Aug 20, 2017
    #1
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  3. Aug 20, 2017 #2
    shogun

    shogun Road Train Member

    6,075
    72,161
    Jan 23, 2009
    Doing a regen
    0
    Air leaks are fairly easy to find, especially after it rains. I would check the fittings at the air bags, and listen to the connections at the air tanks. A little soapy water sprayed will bubble up and help you find it faster.
     
    shogun, Aug 20, 2017
    shogun, Aug 20, 2017
    #2
  4. Aug 20, 2017 #3
    blairandgretchen

    blairandgretchen Road Train Member

    13,669
    74,401
    Dec 9, 2011
    South west Missouri
    0
    Paccar motor?

    If so, may be in the EGR system, buddy has discovered the same problem.

    $700 part and 5 hours labor - it's a turbo removal to get to it.

    Audible leak - down to 70 psi? A diaphragm.
     
    blairandgretchen, Aug 20, 2017
    blairandgretchen, Aug 20, 2017
    #3
  5. Aug 20, 2017 #4
    Robert85006

    Robert85006 Medium Load Member

    359
    398
    Aug 20, 2013
    Southwest USA
    0
    Had a similar problem last year. Heard a whistle while going down the road. I tried everything I could think of. One day I put my hand out and touched the mirror bezel and the whistle went away. As trucks age a small gap develops in the plastic mirror bezels and a whistling sound can be heard. A couple long strips of electrical tape and the noise was gone. Since the tape has a nice clean line, it looks like it was built that way. Problem solved. Hope yours is that easy.
     
    Robert85006, Aug 20, 2017
    Robert85006, Aug 20, 2017
    #4
  7. Aug 20, 2017 #5
    magoo68

    magoo68 Road Train Member

    3,393
    5,385
    Jun 11, 2011
    st malo mb canada
    0
    Air to Air leaking?? If noise increases with boost I'd look in that area and test it
     
    magoo68, Aug 20, 2017
    magoo68, Aug 20, 2017
    #5
  8. Aug 28, 2017 #6
    King

    King Bobtail Member

    15
    1
    Jul 11, 2012
    0
    Thanks for all your response.It ended up being the EGR valve.
     
    King, Aug 28, 2017
    King, Aug 28, 2017
    #6
    magoo68 Thanks this.
  9. Sep 15, 2017 #7
    King

    King Bobtail Member

    15
    1
    Jul 11, 2012
    0
    Well I had the manifold gaskets done and the Egr valve replaced and the noise returned a couple days later.Still can't figure out where it's coming from.Anyone have anymore suggestions?
     
    King, Sep 15, 2017
    King, Sep 15, 2017
    #7
  10. Sep 15, 2017 #8
    stayinback

    stayinback Road Train Member

    3,911
    8,256
    Jan 24, 2014
    chicago,il
    0
    Well,Lets back up a second- a Mechanic told you it was the EGR valve?
    So you emptied the wallet on a wing and a prayer.
    Couldn't have been cheap- I'd be pizzed.

    Probably gonna be something simple in the air system-
     
    stayinback, Sep 15, 2017
    stayinback, Sep 15, 2017
    #8
  11. Sep 15, 2017 #10
    King

    King Bobtail Member

    15
    1
    Jul 11, 2012
    0
    Yes it was expensive.The noise is not immediate.I guess on the test drive they were not able to hear it.I can drive for a couple of hours some days and it will run fine before the noise starts but I'm thinking it's a air leak somewhere too.It does not make the noise when I'm driving in rain either.
     
    King, Sep 15, 2017
    King, Sep 15, 2017
    #10
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