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Injector cut out test

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by istumped, Jan 20, 2018.

  1. Jan 20, 2018 #1
    istumped

    istumped Medium Load Member

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    Feb 8, 2015
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    Working with a 98 dd ddec 4 12.7 s60. Will a injector cut out test be able to detect worn nozzles or tips? Or is it better to do a benchtest? Also when replacing injectors should the codes be changed. Old school dd guys say set all injectors to 75. Your thoughts?
     
    istumped, Jan 20, 2018
    istumped, Jan 20, 2018
    #1
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  3. Jan 22, 2018 #2
    GrapeApe

    GrapeApe Road Train Member

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    A cut-out test will identify weak cylinders, which is not always bad injectors. In my experience if a cylinder or two show weak at idle, but improves at 1000 RPM, it's an indication of a poor spray pattern on the injector. As far as trim codes, YES, change them to what the injectors say.

    Anytime a cut-out test shows an issue, you should double check overhead adjustment, check for aerated fuel and fuel pressure.
     
    GrapeApe, Jan 22, 2018
    GrapeApe, Jan 22, 2018
    #2
    Majagua88, xsetra and SAR Thank this.
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