2004 volvo w/cummins isx

Discussion in 'Volvo Forum' started by arizonasteel, May 17, 2015.

  1. arizonasteel

    arizonasteel Bobtail Member

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    May 15, 2015
    0
    Engine has a loud knock at front of motor @1500 to1600 rpm. Runs great and good fuel mileage. Replaced air pump but didnt fix.. any ideas?
     
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  3. benrab

    benrab Medium Load Member

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    Apr 5, 2015
    Quebec ,Canada
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    Question : Since that noise begin is the noise increase or it still the same ?
    Or comes louder with the time ?
    I'm suspecting a crankshaft damper issue ?
    If it is the case when you increase engine speed and decrease engine speed between 1400-1600 Rpm you will heard a big rattle come from the engine .
    Hope this can help.
    Ben
     
  4. benrab

    benrab Medium Load Member

    326
    238
    Apr 5, 2015
    Quebec ,Canada
    0
    By the way when the air compressor has been change do you know if the air compressor crankshaft has been timed propelly with the engine cranshaft ?
    If not that generate noise in the gear train, worse when the air compressor is pumping.
    Ben
     
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