Cummins ISX Breathing

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Smellfunny, May 28, 2024.

  1. Smellfunny

    Smellfunny Road Train Member

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    Customer has this ISX that he had at another shop and it was mixing oil into the coolant. He had a complete oil cooler from PDI installed and they said they flushed the system but it is still mixing. I told him I could flush the system and see if they just did a poor flush but as I was flushing it this is his blowby out of the oil fill tube. To me this is a little excessive. https://youtube.com/shorts/M0UapctWCIs?si=cXaAYVlvJdUOgfwC
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Moisture on the bottom of the filler cap, or the bottom of the blow by tube?

    You could pull the valve cover and know for certain.

    Of course, it's hard to get all the oil out of a cooling system. Usually takes 4 or 5 flushes for me, and those aren't just fill, bring to temp flushes.
     
  4. Smellfunny

    Smellfunny Road Train Member

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    Yeah. Not sure what kind of flush they did. It usually takes me longer to flush one than it does to replace an oil cooler.
     
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  5. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Me too
     
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  6. Mr Bob

    Mr Bob Light Load Member

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    dawn soap might help.
     
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  7. Lazer

    Lazer Road Train Member

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    Cascade powder is what I’ve been told works the best.
     
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  8. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    I've used powder and liquid cascade. Less possibility for blockage with the liquid.

    No foaming soaps though like dawn
     
  9. Star Rider

    Star Rider Road Train Member

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    If you use cascade powder dissolve it in a container of hot water first, then pour it in.
     
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  10. JB7

    JB7 Medium Load Member

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  11. Big Road Skateboard

    Big Road Skateboard Road Train Member

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