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More Cooling Please...

Discussion in 'Early CJ5 and CJ6 Tech' started by SpeyRod, Aug 11, 2018.

  1. Aug 11, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
    Joined:
    Jul 25, 2018
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    48
    I was running late for an appointment so I had to jump on the freeway Friday. I had to drive a 13 mile stretch of flat and maintain a safe speed. I was turning 2,800-3,000 rpm and watched as the temp built up. When I got off at my exit I was touching 208+-. Today I flushed the rad of the old rusty green juice and ran a couple gallons of distilled through it to flush as much as I could. I replaced with 1gallon of green concentrate and a quart of distilled.

    On my old xj I bought a 3 pass core that really helped keep it cool. Does anyone make such a thing for the cj5? What do I have to know to order the correct one? Any other tips or tricks to keep this running cool, besides stay off the fwy?
     
  2. Aug 11, 2018
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

    Medford Mass USA
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    Year, model, equipment? Good to put that in your sig so it's always there.

    Assuming you have a V6 Jeep, there should be quite a few threads about radiators if you search. site:earlycj5.com V6 radiators - Bing

    Swaps sometimes use Mustang or Fiero radiators. There are aluminum hot rod radiators that will likely work if you are willing to sort out the mounting.

    Old-fashioned radiator shops still exist that can recore your existing radiator with 3-rows, if the tanks will accept them. Tends to be prohibitively expensive today, if you can find a shop. How much do you want to spend?
     
  3. Aug 11, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
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    Jul 25, 2018
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    48
    I am figuring out what year it is. It is registered as ‘65 but others have id’d features from 70-71. Good idea putting it in my sig line, when I figure it out...

    Thanks for the reply.
     
  4. Aug 11, 2018
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

    Medford Mass USA
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    You're welcome. So I would assume it has a Buick 225 V6? You did not reply with much information. Hard to help without any details. Engine size and/or a picture of the engine compartment and radiator would help if you are not sure of the year. This would determine whether it's a swap or factory, and the '71s are differnt in this area as I recall.
     
  5. Aug 11, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
    Joined:
    Jul 25, 2018
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    Tim,

    Thanks for your patience, I can be a little slow on the uptake...

    Here is the radiator from 2 views. I have been told the engine is a 231 even fire...
    [​IMG]
    [​IMG]
     
  6. Aug 11, 2018
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member Sponsor

    Denver, CO
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    Jul 18, 2013
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    2,402
    I had mine worked on by a local shop twice: first time didn't seem to be all that great - sprung a leak. Went to a different shop and its working well so far. Not the most common thing anymore to get radiator repair work done.
    I did some research for a replacement and this looked like a good aftermarket option - this is specifically for a 225v6, but believe it should work just the same with a 231. You have what look like 231 valve covers to me...others can chime with better info. As you probably know, the 231s came in both even and odd fire.
    CJ5 CJ6 Radiator (70-71) Buick V6
     
  7. Aug 11, 2018
    Oldriginal86

    Oldriginal86 Member

    Pasadena, Md.
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    Nov 5, 2014
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    451
    The grill looks like an f head grill. Could be a 4 cylinder radiator also. Don’t think that’s enough radiator for a v6.
     
  8. Aug 11, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
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    Jul 25, 2018
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    Thanks for everyone’s input. I really don’t know squat at this point but I am trying to learn.
     
  9. Aug 11, 2018
    Keys5a

    Keys5a Sponsor Sponsor

    Florida Keys
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    From the valve cover, that looks like it may be a 231 even-fire engine. I see a flex-a-lite fan blade which I would change out if its older than maybe a year old. They can throw blades with little to no warning. A shroud around the fan can drastically increase the efficiency of the radiator., especially a marginal one.
    -Donny
     
  10. Aug 11, 2018
    Zoomer

    Zoomer eJeeper (walking) Sponsor

    Minnesota
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    There were two widths of radiators with the 225, if it originally came with a v6.....
     
  11. Aug 12, 2018
    Twin2

    Twin2 wasn't me Sponsor 2019 Sponsor

    Virginia Beach, VA
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    I would pull the radiator . take it to a old time radiator shop . these shops still work on truck radiators
    have it boiled and rodded . if its somewhat stopped up . highway engine speed it will overheat
     
  12. Aug 12, 2018
    sterlclan

    sterlclan Member Sponsor

    exploring the...
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    x2 on a shroud
     
  13. Aug 12, 2018
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

    Medford Mass USA
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    In my experience, the Flex-a-lite fans are also very noisy. And the edges of the blades are sharp.

    Getting a shroud is a good idea, but I suspect Oldriginal86 is right and this is a 4-cylinder grille and radiator. (If not, me agreeing will prompt someone to say I'm wrong! :)) It looks like a factory installation. Measuring the size of the core could be helpful.

    It also would be helpful to explore the origins of your drive train more thoroughly. First, the sequential serial number of your chassis should be stamped into the frame near the right front shock mount. These numbers continued to increase from model year to the next over this era. We have collected serial numbers in a document at the top of the forum that will help you to bracket the production date, and this could verify the number and date on your registration.

    I'd also look closely at how the engine is mounted. If the engine was swapped in, some kind of new frame towers to support the engine on insulators (motor mounts) is needed. If a swap, these could be home-made or adapted from some other vehicle (including another CJ). I would also check out exactly what transmission you have. A 1965 4-cylinder would have come with the T-90 or T-98 transmission - look at the casting number on the side of the transmission.

    Your Intro thread also mentions that you have a hard time getting up to highway speed. A 1965 would have come with 5.38:1 axle ratio or 4.27:1 optional. 5.38s are quite common, and are stump-pullers. The V6 Jeeps had 3.73:1 std and 4.88:1 optional. Look at the axle covers for a tag under one of the cover bolts. Should have the ratio stamped in. If no tags, pull the axle cover and look at the edge of the ring gear for the tooth counts, ie "41 11" is 41/11 = 3.73. Good practice to pull the covers, inspect and refresh the gear oil, if you have not.
     
    Last edited: Aug 12, 2018
  14. Aug 12, 2018
    Twin2

    Twin2 wasn't me Sponsor 2019 Sponsor

    Virginia Beach, VA
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    dead give away . 4 cylinder lower outlet drivers side . V6 outlet passenger side
     
    FinoCJ likes this.
  15. Aug 12, 2018
    71CJ54WD

    71CJ54WD Sponsor Sponsor

    DC
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    I believe thats the stock V6 radiator. 208 doesn't worry me though. Especially at those RPM's sustained for a period. I got a reproduction fiberglass shroud on mine which should make yours run cooler.
     
    ojgrsoi likes this.
  16. Aug 13, 2018
    Muzikp

    Muzikp Sponsor Sponsor

    Sacramento Ca.
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    x7 on the shroud, I have what looks like the same radiator. I'm assuming it's the shroud, I've never seen mine run over 195 even on hot days and on the freeway.
     
  17. Aug 13, 2018
    71CJ54WD

    71CJ54WD Sponsor Sponsor

    DC
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    I used this shroud. Its raw primed fiberglass so I hit with some alkyd hammer finish paint and its looking really nice and glossy. Mud won't stick to the painted areas now. Just make sure you get the correct size. I originally got the incorrect one and had to swap it out.

    1955-86 JEEP CJ5 - Cooling - Partsdude4x4
     
    Hellion likes this.
  18. Aug 15, 2018
    Warloch

    Warloch Did you say Flattie??? Staff Member Sponsor

    Falcon, CO
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    Just to note - I use the old 4 cyl radiators in the flatties with the 225/231 all the time. I use a shop to move the bottom outlet and pressure test, upgrade the cap and they work fine.
     
    Rich M. and jpflat2a like this.
  19. Aug 16, 2018
    SpeyRod

    SpeyRod New Member

    Ashland, OR
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    Jul 25, 2018
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    Some great input gentlemen, thank you. When I first picked up the Jeep I went by the local parts store I have used for years. The owner and a customer came out to help me figure out what I had. The customer was a tow truck driver who dove right in, and under the truck. He definitely knew his way around a truck. His biggest tip after climbing all over it was, “I would put a shroud on this thing. It will really help keep it cool.”

    Thanks for the confirmation and the link!
     
  20. Oct 9, 2018
    Tomellen

    Tomellen Member

    Ticonderoga, NY
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    Sep 16, 2016
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    300
    w hich did u use the one with the bottom missing or the one that goes all around. u have a 71 which may have a different ize radiator than the 68 which I a 17 in core.
     

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