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Turbo whistle

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JimMatthews89, Mar 2, 2022.

  1. Mar 2, 2022 #1
    JimMatthews89

    JimMatthews89 Bobtail Member

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    Mar 24, 2015
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    I have a 2017 Kenworth T680 with a Cummins ISX 15 550 hp engine. I have a whistle in my turbo. The whistle is at idle and with increased RPMs. What's weird is, it goes quiet after about 10 minutes at idle. I also noticed, while it's whistling at idle, my idle usage shows 2 gal/hr. But when it shuts up, idle usage goes down to .8 gal/hr.

    Neither I nor several mechanics can find an exhaust leak. Turbo is dry, with no play, and turbo psi is working normally. ( 20 psi on small grades up to 40 psi on large grades depending on the load).

    After long periods of driving, when I come to a stop, sometimes it will be squealing other times it won't. This is driving me insane. When it squeals, it is so loud you can here it across the parking lot. Not a single mechanic I've taken it to can figure it out. Thanks in advance!
     
    JimMatthews89, Mar 2, 2022
    JimMatthews89, Mar 2, 2022
    #1
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  3. Mar 2, 2022 #2
    Hulld

    Hulld Road Train Member

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    Oct 19, 2015
    Upstate NY
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    Sounds like it might use a VGT turbo and it’s worn or sticking?
     
    Hulld, Mar 2, 2022
    Hulld, Mar 2, 2022
    #2
    Oxbow and Bean Jr. Thank this.
  4. Mar 2, 2022 #3
    okiedokie

    okiedokie Road Train Member

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    Leaking gastket...usuallly under the EGR?
     
    okiedokie, Mar 2, 2022
    okiedokie, Mar 2, 2022
    #3
    Oxbow Thanks this.
  5. Mar 3, 2022 #4
    Petegraintrain

    Petegraintrain Bobtail Member

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    Sep 29, 2018
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    Is this truck egr deleted? Might be switching to the wrong operating mode. Trying to warm up a non existing SCR can
     
    Petegraintrain, Mar 3, 2022
    Petegraintrain, Mar 3, 2022
    #4
  7. Mar 3, 2022 #5
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    You likely have a cracked exhaust manifold gasket just starting to leak. When the turbo changes exhaust back pressure the noise can change and or go away. the noise is the exhaust leaking by the bi-metal manifold gaskets as they are cracked and vibrating. Inspect closely for small soot trails exiting the manifold at the cylinder head. Most often #2 or #5 but could be others as well.

    Find a shop with a smoke machine and leak check the hot side of the engine and the leak will show its face.
     
    Goodysnap, Mar 3, 2022
    Goodysnap, Mar 3, 2022
    #5
    PumpkinOvalHead and Oxbow Thank this.
  8. May 1, 2022 #6
    JimMatthews89

    JimMatthews89 Bobtail Member

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    Mar 24, 2015
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    Any recommendations for a good shop that won't rape me in labor? I've had my fair share of bad ones.
     
    JimMatthews89, May 1, 2022
    JimMatthews89, May 1, 2022
    #6
  9. May 1, 2022 #7
    JimMatthews89

    JimMatthews89 Bobtail Member

    7
    3
    Mar 24, 2015
    0
    This is what it looks like.
     

    Attached Files:

    JimMatthews89, May 1, 2022
    JimMatthews89, May 1, 2022
    #7
  10. May 1, 2022 #8
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    I see some staining on the EGR pipe. Looks like something may be leaking from above out of the picture.

    Nothing immediately concerning that I can see.

    Truck repairs are expensive. Most dealer door rates are closing in on or at 200hr. What area do you frequent?
     
    Goodysnap, May 1, 2022
    Goodysnap, May 1, 2022
    #8
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