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Water Pump Ports

Discussion in 'Early CJ5 and CJ6 Tech' started by tripilio, Apr 28, 2020.

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  1. Apr 30, 2020
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    But that doesn’t explain why both. Willie really appeared unmodified (except for a homemade 2by4 and metal top) when I got him, having spent his life on a ranch in central Texas. I didn’t look like the plug in the head was ever moved. But after 60+ years who knows.
     
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  2. Apr 30, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I never really put any thought into it but I suppose it would help the engine warm up faster and stay warm in a really cold climate, such as Alaska like Pete mentions.
     
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  3. Apr 30, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    If you mean "both" and heater and by-pass, early CJ5 had a shut-off valve on the engine to disable flow through the heater. That would leave the by-pass as the 'only' flow.
     
  4. Apr 30, 2020
    tripilio

    tripilio Proud American!

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    ...which is the opposite to what I need in SoFla, where we have 85-90 most of the time!
     
  5. Apr 30, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

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    Until the thermostat opened.
     
  6. Apr 30, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Which it may never do in cold conditions.
     
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  7. Apr 30, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

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    Exactly! Your earlier comment mentioning Alaska got me to thinking about this, making the by-pass a logical idea.
     
  8. Apr 30, 2020
    Jrobz23

    Jrobz23 Member

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    lol yeah, I'm bettin it's something to do with the varying climates they were made for. The nice 65 motor I had a couple years back was blocked off and plugged. Not sure on origin. The '57 is a northern WI lifer and had the bypass active.
     
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  9. Apr 30, 2020
    mickeykelley

    mickeykelley Well-Known Member

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    But no heater, is the same as heater but blocked off. I’m still missing something here.
     
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  10. Apr 30, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

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    The lesser the amount of circulating water going through the radiator the higher the water temperature would be. Flow through the bypass would recirculate strictly through the engine. Makes sense when in a really cold climate.
     
  11. Apr 30, 2020
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Without the bypass the thermostat is in the coldest part of the engine.
    I'll start a little survey:
    1960
    Factory installed cab factory heater. Dealer plow. Delivered to Upstate NY and I believe it did not have a bypass.
    Noteworthy observation it did not have a heater shut off valve when I got the jeep.
    No fan shroud.
     
    Last edited: May 1, 2020
  12. May 1, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Yes. In extreme cold I've experienced the engine block boiling before the 180ºF thermostat opened. Had to go to a lower temp thermostat.
     
  13. May 1, 2020
    ojgrsoi

    ojgrsoi Retired 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    This 1970 original water pump has no bypass port. The heater is fed by the port on the curb side of the pump. The plug is in the head just as the OP showed. The replacement pump I purchased (AIRTEX) has both ports.

    [​IMG]
     
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  14. May 1, 2020
    tripilio

    tripilio Proud American!

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    That is exactly my case. My original configuration was like that and the replacement pump has both ports, the one that I had originally connected to the heater is plugged and a nipple is installed on the top one that would connect to the head. That is why I started this thread with that question.
     
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  15. May 1, 2020
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Is there any shut-off valve on the water flow to the heater? If not then perhaps the factory felt they could delete the bypass, since the heater flow distributes coolant throughout the block when the thermostat is not open.
     
  16. May 1, 2020
    ojgrsoi

    ojgrsoi Retired 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    My new pump came with both ports plugged. The plugs required a hex allen socket in a size I didn't own. :mad: So a trip to HF :ninja: and $8 just to unplug that port....



    No shut off. When I fixed the heater, the original rotten heater hose didn't appear to have had a shutoff. :shrug:
     
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  17. May 1, 2020
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

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    Yes, but that hex key will last forever in the bottom of your tool box, passed on down from generation to generation as a valuable family heirloom. :D
     
  18. May 2, 2020
    kenb

    kenb Cleverly disguised as a responsible adult

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    Does anyone know what was done for hoses in industrial application engines?
     
  19. May 2, 2020
    mickeykelley

    mickeykelley Well-Known Member

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    So I’m still missing something here. Willie has no heater, at the moment, and that port is plugged. So no water flows out except thru the block to the head to the thermostat back to the radiator. So if it had a heater And shutoff open some water would go thru the block, then exit the back of the head (now the water is at its hottest?) and flow thru the heater, thru the open shutoff and back to the pump to go thru block again, thus skipping the radiator until the thermostat opens. With the shutoff closed, no water circulates thru heater. So with or without heater, the bypass just allows some water to be pulled from the head which had gone thru the block and put it back thru the pump and back to block, thus skipping the radiator when thermostat is closed. So I’m not seeing any difference in the bypass being related to heater. Without the bypass, no water circulates until the thermostat opens. With a bypass, some water does circulate whether or not the the heater is open or closed. All of this of course excludes the small amount of water that goes the the hole with thermostat closed.
     
  20. May 2, 2020
    ojgrsoi

    ojgrsoi Retired 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    My only guess would be you need the diameter of the inlet/outlets at the power plant and the diameter of the inlet/outlets of the radiator. Determine the length and buy one of those universal hoses. When I was in fleet we used this method or went back to the manufacturer of the device.
     
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