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How do you keep the engine temperature up?

Discussion in 'Early CJ5 and CJ6 Tech' started by manden68, Jan 24, 2007.

Page 2 of 2
  1. Jan 26, 2007
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
    Joined:
    Nov 27, 2006
    Messages:
    2,793
    Wait till you get down here to Arizona and lets see if you still think the cooling system is up to it. Although Prescott is cooler, being above 5000 feet, and gets snowed on a lot.R) :coffee:
     
    1960willyscj5, Jan 26, 2007
    #21
  2. Jan 26, 2007
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,128
    I'm in complete agreement with madizell on the thermostat, just pull the rad cap & watch for 10 minutes, you can see the change in flow as the thermostat cycles. The "pill" is actually some sort of wax formulated to melt at a specific temp encased in an itty bitty hydraulic cylinder. Above that temp it melts it expands, when below it solidifies & contracts.

    re. jeeps overheating I'd suggest moving up to a rad from a M38A1, they're three core vs. the civvy 2 core version. They arn't mentioned in the parts manual but Tonk had one on him & it appears to have been original equipment.

    H.
     
    Howard Eisenhauer, Jan 26, 2007
    #22
  3. Jan 27, 2007
    GPin

    GPin Member

    Spokane, Washington
    Joined:
    Jul 31, 2006
    Messages:
    216
    Sometimes, especially in 30-40year old jeeps, the cooling hoses get routed to a different location than stock, now I know most jeeps have all the stock parts on them, yea right, anyway if the heater hose gets routed from the water pump and returned to a fitting on the radiator, then the thermostat will be bypassed by the heater core causing a cold engine. That is what I meant by hose routing.
     
    GPin, Jan 27, 2007
    #23
  4. Jan 27, 2007
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
    Joined:
    Sep 10, 2003
    Messages:
    2,084
    sounds like you need a higher thermostat to me. would go for at least 195*, 200* would be better.
     
    66cj5, Jan 27, 2007
    #24
  5. Jan 27, 2007
    Strider380

    Strider380 Can I have a zip tie?

    New England
    Joined:
    Jan 12, 2006
    Messages:
    1,117
    Yea, I see what your saying GPin. Just out of curiosity, anyone have a stock 258 with a stock speedo/fuel/temp assembly? How far does everyones needle move on the temp? Mine moves only maybe 1/5th.
     
    Strider380, Jan 27, 2007
    #25
  6. Jan 27, 2007
    Executioner

    Executioner Member

    Reading,Pa, USA
    Joined:
    Aug 19, 2006
    Messages:
    347
    Wax? I thought it was a bimetal spring? I know one thing that would help and also give more power is a fan clutch. My little F head's fan run's constantly with engine speed and I know I'm loosin alot of power with that fan always pushin air:rofl: I may do some modifications come spring.
     
    Executioner, Jan 27, 2007
    #26
  7. Jan 27, 2007
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
    Joined:
    Sep 20, 2002
    Messages:
    4,350
    Clutch fans work off temperature not speed. Look in the front and you will find a thermostatic spring. :rofl:
     
    blevisay, Jan 27, 2007
    #27
  8. Jan 28, 2007
    zed

    zed Iowa- Gateway to Nebraska

    central iowa
    Joined:
    Aug 4, 2004
    Messages:
    745
    i'm with mcruff on this one. i am running a 185* thermostat. it's new even in the summer (90*+) it stays at the cool end of the green. it did this even before i replaced the rad core from 2 to 3.

    ever look at the front of diesel semi's in the winter?
     
    zed, Jan 28, 2007
    #28
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