Hollow whistle and screeching noise

Discussion in 'Ask An Owner Operator' started by kay_ray, Oct 1, 2020.

  1. kay_ray

    kay_ray Light Load Member

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    hey guys so i have this high hollow whistle type noise coming from engine when the rpms are high and sometime when manifold pressure is close to 30 psi. Its a cummins isx15 with 420,000 miles on it. You can hear it clearly at 3 sec and 25 sec mark in video
     
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  3. "semi" retired

    "semi" retired Road Train Member

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    I didn't hear it well, but turbos make a screeching noise when they go south. Is oil dripping out the bottom of the turbo? If the bearing goes, it usually takes out the seal.
     
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  4. kay_ray

    kay_ray Light Load Member

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    No oil dripping . No oil pressure or power loss. .does the bad engine belt make that noise too ?
     
  5. snowwy

    snowwy Road Train Member

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    Could be a bearing noise from alternator or idle pulley also.

    Connect Bluetooth to radio you can hear the sound better.
     
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  6. "semi" retired

    "semi" retired Road Train Member

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    It may be a bit intimidating, but nothing will happen. Open the hood, and find the throttle or have someone rev the motor, and listen to the motor. ( be careful of the fan) You might hear it, only quieter. Probably not a turbo, more likely a pulley or belt tensioner like snowy sez.
     
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  7. Judge

    Judge Road Train Member

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    Like my old boss once said.
    “Keep going, it’ll show itself eventually then you can fix it.”
     
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  8. kay_ray

    kay_ray Light Load Member

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    I think that too. Going to change both belts and pulley today . If it still happens turbo is coming off. And one more thing this sound is pretty loud with jake brake on full with one lower gear .
     
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  9. kay_ray

    kay_ray Light Load Member

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    Ahaha i try to keep everything up to date and change before they fail .
     
  10. Judge

    Judge Road Train Member

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    I’ve also heard, “If you’re not tearing something up, you’re not working.”
     
  11. "semi" retired

    "semi" retired Road Train Member

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    That's an old farmer saying, "if it doesn't break, you ain't workin", and it's true. Farmers go from one break down to the next.
     
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