Cummins ISX Still Overheating

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Working Class Patriot, Jul 26, 2014.

  1. Working Class Patriot

    Working Class Patriot Road Train Member

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    Ok here's the list:
    Replaced both thermostats...
    Flushed out cooling system and replaced coolant...
    Blew out all of the build-up between the cores....

    Mainly overheats pulling long grades...

    Oil temp spikes over 300*
    Coolant spikes to 280*...

    What's next?
     
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  3. Duramaxxed

    Duramaxxed Light Load Member

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    Is the fan working? Is it a borg Warner fan hub, they are known to slip if the disc gets worn. Check your radiator cap. If the system can't build pressure the coolant boils. Are you pushing coolant from the system when hot? Could be a head gasket. Remove the return to the surge tank and make sure it's circulating coolant. Maybe the water pump impeller is slipping.
     
  4. turbo64

    turbo64 Light Load Member

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    It don't much matter now your gonna need a new head, that's right one piece about 5 K us. As hot as that is I doubt its working, can you hear it come on loud roar then
     
  5. turbo64

    turbo64 Light Load Member

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    It don't much matter now your gonna need a new head, that's right one piece about 5 K us. As hot as that is I doubt its working, can you hear it come on loud roar then it stops until it gets up to 195.
     
  6. Working Class Patriot

    Working Class Patriot Road Train Member

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    Fan works...
    I'm not losing any coolant either...
    Water Pump is working too...

    This is why I'm finally stumped...
     
  7. Duramaxxed

    Duramaxxed Light Load Member

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    You want the cummins troubleshooting for coolant temp?
     
  8. Largecar359

    Largecar359 Road Train Member

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    The issue is water pump. 90% sure one that one. Guessing your motor is between the yrs of 2007-2014. The fins in the pump are not flowing the coolant, they either broke or are chipped. Some pumps even use plastic fins in the cummins pump, horrible design causes lots of these issues. Just something to look into.
     
    mitmaks Thanks this.
  9. turbo64

    turbo64 Light Load Member

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    If it got that hot head gasket for sure, you will start seeing water in oil. Your fan does not seem to be coming on could be as little as a sensor. But first you have to find out if its coming on.Cross your fingers if it got that hot! r in
     
  10. Heavyd

    Heavyd Road Train Member

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    Ok, coolant and oil temps in that range will destroy an engine. They will also give you check engine lights and severe derate. Are you getting any check engine lights? Where are you getting these temp readings from? What kind of truck do you have, year and model. This may be a gauge issue.
     
  11. turbo64

    turbo64 Light Load Member

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    I swear they design these engines to break!
     
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