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Dauntless Ran A Little Hot Any Tips

Discussion in 'Early CJ5 and CJ6 Tech' started by Montgomery J Yarbrough, Aug 11, 2021.

  1. Aug 11, 2021
    Montgomery J Yarbrough

    Montgomery J Yarbrough Member

    Lander wyoming
    Joined:
    May 28, 2018
    Messages:
    59
    After two years of a lot of work, I took my jeep rockcrawling it did great but about a 2 mile stretch of nothing but steep rocky incline my jeep was running a little hot 218 degrees f I have the buick 225 everything is new. I have read a bigger crank pulley from a buick 350 or 455 would help but after looking theirs multiple one so any suggestions would be appreciated. Other than that steep incline and I mean steep with massive builders it ran 204 degrees
     
  2. Aug 11, 2021
    RATTYFLATTY

    RATTYFLATTY I think you need a little more throttle

    Central MN
    Joined:
    Oct 23, 2007
    Messages:
    515
    What fan/shroud setup are you running? This is where you can capitalize on system efficiency for slow trail speeds. I run a 7 blade fan and clutch setup off a Wag, is moves a lot of air. It will rob some power but it never gets hot.
     
  3. Aug 11, 2021
    Steve's 70-5

    Steve's 70-5 Active Member

    Louisville, Ky
    Joined:
    Nov 12, 2009
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    1,381
    Scott had a hot running engine on the Rubicon. I think it was a lean carburetor.
     
  4. Aug 11, 2021
    4S50

    4S50 I’m back!

    Idaho
    Joined:
    Sep 30, 2002
    Messages:
    123
    I just added a shroud to mine after the last Rubicon trip and it made a significant difference, even with the original 4 blade fan.
     
  5. Aug 11, 2021
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Jan 23, 2014
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    4,170
    X3 on a close-fitting shroud on the radiator.
    -Donny
     
  6. Aug 11, 2021
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
    Joined:
    Aug 13, 2015
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    6,656
    What year? Stock radiator?
    Every earlier v6 I ever had with the smaller rad, I had problems keeping them cool. The change to a bigger radiator in 68? 69? was a smart move by Kaiser.
     
  7. Aug 11, 2021
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
    Messages:
    4,457
    I am sort of in Rattyflatty's camp but I don't even use a clutched fan. Install the largest six+ fixed blade fan that will fit and absolutely use a well fit shroud. Yep, it will cost you a little power and economy but that's not too big a deal with a 225 and in a Jeep that presumably doesn't see a lot of highway miles. In my 3B, I also had a custom water pump pulley machined to speed the pump/fan up 15%.

    And if you have not already done so, throw a bottle of water wetter in the radiator. The stuff does work. I typically use Red Line.
    WaterWetter®
     
    Norcal69 likes this.
  8. Aug 11, 2021
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Northern California
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    Sep 6, 2014
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    3,547
    x2
     
  9. Aug 11, 2021
    Bob

    Bob Member

    Northern California
    Joined:
    Sep 23, 2002
    Messages:
    435
    Yep, a good shroud makes a noticeable difference. I’m running a shroud, 6-blade fan and a “hi-flow” 180° thermostat. Haven’t had any overheating issues.
     
    Vanguard likes this.
  10. Aug 11, 2021
    Montgomery J Yarbrough

    Montgomery J Yarbrough Member

    Lander wyoming
    Joined:
    May 28, 2018
    Messages:
    59
    Thanks all for the replay I will look for a bigger fan
     
  11. Aug 12, 2021
    SoCalNickG

    SoCalNickG Member 2023 Sponsor 2022 Sponsor

    Whittier, CA.
    Joined:
    Mar 17, 2017
    Messages:
    346
    Get a shroud if you don't have one. I purchased a fiberglass one from Parts Dude.
     
    dnb71R2 likes this.
  12. Aug 12, 2021
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
    Joined:
    Jun 24, 2004
    Messages:
    1,132
    I made a shroud out of a piece of tin and installed a 7 bladed fan off an early F350. It will pull at my coveralls at idle when I stand in front of the grill. In retrospect it is a bit overkill but the temps have never been an issue during technical wheeling.
    BTW, big fans can be really noisy at highway speeds.
     
  13. Aug 12, 2021
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
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    4,457
    Shrouds can be fabricated out of all sorts of stuff. I've seen fiberglass, steel, and aluminum. Some applications take a little effort to fit but a stock 225 Jeep should be straight forward. As noted above, you can probably find a stock replacement but that will likely limit your fan selection. Flex-a-lite has are relatively large selection of belt driven fans.
    Flex-a-Lite Automotive Belt Driven Fans

    My 3B is sporting the last one in that selection, # 106285
    [​IMG]

    [​IMG]
     
  14. Aug 12, 2021
    4S50

    4S50 I’m back!

    Idaho
    Joined:
    Sep 30, 2002
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    Last edited: Aug 13, 2021
  15. Aug 15, 2021
    Montgomery J Yarbrough

    Montgomery J Yarbrough Member

    Lander wyoming
    Joined:
    May 28, 2018
    Messages:
    59
    Thank you people I did away with my 15 inch 4 blade fan went with a 18 inch 6 blade I can now idle at 200 degrees vs shutting it down at 220 plus at idle
     
    Fireball likes this.
  16. Aug 15, 2021
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Northern California
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    A simple shroud and 6 blade 15” fan will have you running at 185 all day long and not rob nearly as much hp.
     
  17. Aug 15, 2021
    SFaulken

    SFaulken Active Member

    Bellevue, WA
    Joined:
    May 24, 2011
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    I switched to the shroud, fan, and clutch off of a Volvo 740, there's a thread about the parts needed here somewhere. Works great.
     
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