Cummins isx howling/humming

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Petegraintrain, Nov 25, 2021.

  1. Petegraintrain

    Petegraintrain Bobtail Member

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    Sep 29, 2018
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    2015 cummins isx when Its idling at 900 rpm I can hear a howling/humming noise. When I get under the truck and lean in on the oil pan there's a pretty loud howling/humming noise in there. If the rpms are higher or lower it disappears. Only at the 900 rpm mark i can hear it. Any idea what that could be?
     
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  3. Snailexpress

    Snailexpress Road Train Member

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    Probably time to drop oil pan and check oil pump
     
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  4. bzinger

    bzinger Road Train Member

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    My 2013 isx made that low howling noise occasionally too, it disappeared after I had it inframed and never did figure out what was causing it .
     
  5. Petegraintrain

    Petegraintrain Bobtail Member

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    Ok thanks for the info. Wasn't sure if the pump could make that noise or if it was maybe bearings? I also hear it a bit when driving. When the engine is pulling slightly. I guess when there's tension on everything.
     
  6. Snailexpress

    Snailexpress Road Train Member

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    Bearing can make the noise but very short time:eek:. Usually oil pump gear howling due to gear play.
     
  7. Heavyd

    Heavyd Road Train Member

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    Gear train is becoming a sour point for Cummins ISX15 lately. Howling is certainly consistent with a gear train issue.
     
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  8. Petegraintrain

    Petegraintrain Bobtail Member

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    Ok. Oil pump is considered part of the gear train right? Because i hear it more from the bottom of the engine than the front
     
  9. Heavyd

    Heavyd Road Train Member

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    Yep, bottom of the crank gear.
     
  10. ridin_rough

    ridin_rough Bobtail Member

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    I would bet a paycheck that it's your oil pump. It's the bottom of the gear train.... I have replaced atleadt a hundred over the last 15 or so years. The get loud when it's time to replace em. Keep an eye on your oil pressure guage... if you are seeing less than 30psi at above 1400 rpms, replace it. Only takes a couple of hours.... not a big deal. I did my last one in July in the TA parking lot in Eloy, AZ. Biggest issue is dealing with the dirty oil. I will warn you though... the last 5 remans I have put in made a bit of a high pitched whine - nothing can be done about it. Had it warrantied twice in 3 days and all 3 made the same noise.
     
    QUALITYTRUCK Thanks this.
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