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lbond01's avatar
lbond01
Explorer
Jul 19, 2017

Strange sound coming from Cummins 5.9 ISB

I have a 2004 Bounder diesel on a Freightliner with a 5.9 Cummins with 95K. About 3K or 4K miles ago, I started hearing a strange noise when I accelerate hard or I'm on the exhaust brake. Sounds like it is coming from the turbo. It is more of a whine. Has anyone heard of this? Click on the Noise below to hear it, sorry for the wind noise. I was full throttle, then exhaust brake a couple of times.

Noise

3 Replies

  • MEXICOWANDERER's avatar
    MEXICOWANDERER
    Explorer
    Jul 19, 2017
    A Tip

    If you decide to tackle the "fix" yourself and it is within the turbo system I can tell you from experience with the NTC 855 Cummins that the repair is a ballet of sequential steps with a torque wrench. Even torquing fasteners requires a diagram and a torque wrench.
  • rhagfo's avatar
    rhagfo
    Explorer III
    Jul 19, 2017
    Soiunds like an air leak in the charged side of the turbo. Could be a bad or loose boot.
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    Jul 19, 2017
    YEP........that is some noise.....WIND is all I hear


    If turbo 'whines' it is probably the 'silencer ring' has come loose.

    Roll coal folks remove them so that turbo really sings out

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