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Radiator Overflow Tank ??

Discussion in 'Early CJ5 and CJ6 Tech' started by Buildflycrash, Mar 28, 2022.

  1. Mar 28, 2022
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Gulf Breeze FL...
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    Trying to figure out how/where to position a new over flow tank for my V6. Is the height in relation to the radiator a major consideration? It would be easy to mount the tank low on the fender but it would be near or even slightly below the bottom of the radiator?

    Thanks for your help.
     
  2. Mar 28, 2022
    Jw60

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

    Sedalia MO.
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    Low is ok but higher is better.

    The biggest issue I see is having more volume in tubing than expansion in the system. If you have more tubing than the system cycles back and forth it won't "pump" the air out and draw in coolant from the tank.

    I know on mine the overflow is not large enough with the 2nd heater loop and early 4.3 block with straight walls, it will push all the coolant out of the overflow and pull in air.
     
    Last edited: Mar 28, 2022
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  3. Mar 28, 2022
    duffer

    duffer Rodent Power

    Bozeman, MT
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    The one I have in the B is probably most of a foot lower than the top of the radiator. It functions fine.
    [​IMG]
     
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  4. Mar 28, 2022
    boopiejones

    boopiejones I can’t drive 55

    California east bay
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    The top of mine is mounted about flush with the top of the radiator. Works great. Sorry for the sideways picture.
    8C4E0913-B3FC-4116-8183-0BFF011FC7FF.jpeg
     
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  5. Mar 29, 2022
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    Mine is mounted low on the fender.
    You can see it here on the right fender.

    [​IMG]
     
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  6. Mar 30, 2022
    Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Virginia Beach, VA
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    got mine from junk yard . don't remember from what :whistle:but it fit
    over flow tank.JPG
     
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  7. Mar 30, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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  8. Mar 30, 2022
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Gulf Breeze FL...
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    Yes, that is the one I bought.
    The challenge is if I want to mount it somewhat vertical it will need to be low on the fender. I could make some sheet metal bracketry and mount it level with the top of radiator if that was important. Still considering options but want to get this done in the next week or so.
     
  9. Mar 30, 2022
    Desert Runner

    Desert Runner Member 2024 Sponsor 2022 Sponsor

    Hickory, Pa
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    I just used a piece of PVC. Works well for me.

    [​IMG]
     
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  10. Mar 30, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    I mounted that bottle on a bracket next to my radiator in my J10's engine compartment, Granted, there's a lot more room under a J-truck hood than a CJ.
     
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  11. Mar 30, 2022
    Lockman

    Lockman OK.....Now I Get It . 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Silver Hill,...
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    Don't have a Detailed pic , but I just fabbed up a bracket . I mounted mine on the DS, 'cuz my winch control was gonna be in the way , on the PS.
    New overflow.jpg
     
    Last edited: Mar 30, 2022
  12. Mar 30, 2022
    txtoller

    txtoller Member 2023 Sponsor 2022 Sponsor

    Weatherford, TX
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    Not the best image, got mine from Summit.
    [​IMG]
     
  13. Mar 30, 2022
    homersdog

    homersdog Tulsa, Ok 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Tulsa, OK
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    Made this mounting bracket more than 40 years ago. Still going strong! Takes up a lot of fender space though.

    [​IMG]
     
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  14. Mar 31, 2022
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
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    Probably a redundant comment,
    don't forget to insure you have the proper radiator cap for the recovery tank. Early caps only have an inner seal. Later models have a gasket both in the neck and around the top of the neck.
     
  15. Mar 31, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I am not knocking having recovery tanks but am curious as to why they seem to be so popular on Jeeps that didn't originally have one? Is it mainly for the ability to be sure of proper coolant level while the system is warm?
     
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  16. Mar 31, 2022
    SFaulken

    SFaulken Active Member

    Bellevue, WA
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    I run one because it's cheap, and keeps it from puking a toxic fluid all over the ground, if it overheats. Nothing more complicated than that. Same reason I've never left road draft tubes on anything I've had, that had them, and replaced them with PCV setups.
     
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  17. Mar 31, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    That's sound reasoning. (y) Do you use it for checking the coolant level too, or keep the radiator level normal and pop the cap to check it?
     
  18. Mar 31, 2022
    OzFin

    OzFin Vintage Jeep Guy

    Michigan
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    Mine came out of an 1990's era Dodge truck, it fit in nicely and works well.

    [​IMG]
     
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  19. Mar 31, 2022
    duffer

    duffer Rodent Power

    Bozeman, MT
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    I like them because, if properly installed, you purge all the air out of the system.
     
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  20. Mar 31, 2022
    Lockman

    Lockman OK.....Now I Get It . 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I , Myself , do a good amount of shop idling & tuning . I didn't want mine Piss'n on the ground & our Doggie gett'n into it. :whistle:

    Also, it's a Coolant Recovery tank...... when the radiator cools down , it draws the coolant back to top itself off. Kinda like automatic like & much less chance of ' Steaming ' oneself by tak'n a cap off'n a hot Radiator . :whistle::whistle:
     
    Last edited: Mar 31, 2022
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