Engine question!!!

Discussion in 'Ask An Owner Operator' started by Barbeque, May 14, 2019.

  1. Barbeque

    Barbeque Light Load Member

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    What year did Cummins stop putting the manual water shut off valve on. If you’re not getting what I’m asking about? It’s the hand valve you turn for heat in the winter.
     
  2. Ridgeline

    Ridgeline Road Train Member

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    What?

    I have 2019 with hot water valves on them, they are ball valves and factory as factory can get.
     
    Intothesunset Thanks this.
  3. Tug Toy

    Tug Toy Road Train Member

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    I’m sure it’s in the spec of each truck. My 2001 ISX had gate valves on it. I replaced them a couple years ago with 1/4 turn ball valves.

    I’d guess the gate valves were original?

    Our company T680’s 2013 with ISX didn’t have them and the NEW paccar engines we just got don’t have them. I’m sure it’s the way they are ordered.

    Trucks today have better HVAC controls than back in the day so they are not as useful as they used to be. Plus the BTU’s of modern AC is huge compared to old.
     
  4. AModelCat

    AModelCat Road Train Member

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    Its probably not so much engine specific as it is truck manufacturer specific.
     
    spsauerland Thanks this.
  5. Hammer1113

    Hammer1113 Light Load Member

    I don’t know hat they ever QUIT putting them on moreover making them optional. I can’t think of any reason you couldn’t put one on. All it would take is an in-line “T” fitting, and a ball valve. Well actually two of each, you would have to run one supply, and one return line.
     
  6. Powder Joints

    Powder Joints Subjective Prognosticator

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    Dang I thought those were for instant coffee...
     
    JoeyJunk Thanks this.
  7. GreenPete359

    GreenPete359 Road Train Member

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    I think it’s all in the way the truck was ordered. I’ve driven Macks, Cats, & Cummins that were all hit or miss on whether or not the specific truck would have them.
     
  8. Tombstone69

    Tombstone69 Heavy Load Member

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    Kinda like whatever the manufacturer had on hand at the time.
     
  9. RET423

    RET423 Medium Load Member

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    Some are plumbed in line with the def tank heat coil, they don't get shutoff valves because that would also stop the circulation through the def tank.

    If that is the case on your truck then you must separate the def tank lines from the heater core lines and install the ball valves after the split, you cannot just install them in the block port like the pre emission engines had.

    I put them on my PACCAR but I first replumbed it so the heater core was independent of the def tank plumbing so it would not throw a code related to the def temperature
     
  10. fortycalglock

    fortycalglock Road Train Member

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    It’s already been answered obviously that it’s truck manufacturer and who ever orders dependent. Trucks with a modern HVAC with blend doors don’t really need the shut offs. A truck like my Western Star that still uses a HVAC system that always blows through both the heater core and the a/c evaporator still need them.
     
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