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Cummins ISX 485 overpressurizing

Discussion in 'Trucks [ Eighteen Wheelers ]' started by OpsMgr, Mar 10, 2017.

  1. Mar 10, 2017 #1
    OpsMgr

    OpsMgr Bobtail Member

    3
    1
    Mar 10, 2017
    0
    Any and all info is appreciated.
    We have a 2010 Kenworth T800 with this engine. She has about 687K on her now. We're having issues with crankcase high pressure and the coolant tank over pressurizing. We've replaced the air compressor, had the egr cooler checked and cleaned and replaced the crankcase filter. Could it be the head or head gasket? Also, when the fan cuts on, the pressure in the coolant tank backs down. This all happens before she gets to running temp????
     
    OpsMgr, Mar 10, 2017
    OpsMgr, Mar 10, 2017
    #1
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  3. Mar 10, 2017 #2
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,817
    1,782
    Jun 14, 2009
    romulus,mi
    0
    Putting one back together now. Same milage. #5 coolant passage made a "river passage" to cylinder.
     
    QUALITYTRUCK, Mar 10, 2017
    QUALITYTRUCK, Mar 10, 2017
    #2
    Heavyd and OpsMgr Thank this.
  4. Mar 10, 2017 #3
    OpsMgr

    OpsMgr Bobtail Member

    3
    1
    Mar 10, 2017
    0
    Total rebuild?
     
    OpsMgr, Mar 10, 2017
    OpsMgr, Mar 10, 2017
    #3
  5. Mar 10, 2017 #4
    Animosus

    Animosus Heavy Load Member

    730
    2,892
    Dec 7, 2015
    SE Wyoming
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    Sounds like a scored liner.
     
    Animosus, Mar 10, 2017
    Animosus, Mar 10, 2017
    #4
  7. Mar 10, 2017 #5
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,817
    1,782
    Jun 14, 2009
    romulus,mi
    0
    Sorry. Should have given more. Head gasket failed.
     
    QUALITYTRUCK, Mar 10, 2017
    QUALITYTRUCK, Mar 10, 2017
    #5
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