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Old 08-27-2007, 09:05 PM   #1
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Tips on cooling CJ5 258 engine

Hey Guys,
My '78 CJ5 with a straight 6 258 is running pretty hot sometimes and I'm looking for tips on keeping it running cooler. My temperature gauge is not working but sometimes when I drive it it spits coolant out the radiator emergency pressure release hose and I'm concerned that it is running too hot and will be damaged. Are there any ways I could help to cool it? Special fluids? Different radiator type? Different fans? Other ideas?

Thanks!
Steve

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Old 08-27-2007, 11:04 PM   #2
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1. do you have a good shroud on the fan, if the shroud isnt good thatn the fan will be pulling air from around the readiator and not through it, this would be my first place to look, it could be an easy fix either a new shroud or just some duct tape. Second are there any kinks in the hose so that only some water can pass through? third do you know if your water pump is working well? (i dont really know how to check this though)
and if all of this doesnt work i would go to a junkyard and get an electric fan froma k- car and make a few brackets to make it fit in there, it will take some flat bar and some drilling but it fits ove rhte radiator nicely

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Old 08-27-2007, 11:43 PM   #3
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Quote:
Originally Posted by debruins View Post
1. do you have a good shroud on the fan, if the shroud isnt good thatn the fan will be pulling air from around the readiator and not through it, this would be my first place to look, it could be an easy fix either a new shroud or just some duct tape. Second are there any kinks in the hose so that only some water can pass through? third do you know if your water pump is working well? (i dont really know how to check this though)
and if all of this doesnt work i would go to a junkyard and get an electric fan froma k- car and make a few brackets to make it fit in there, it will take some flat bar and some drilling but it fits ove rhte radiator nicely
I'm not sure what a shroud is... any chance that you have a picture? I believe that I just have a fan mounted on a wheel on the front of the motor that is right behind the radiator. Should there be something (a shroud) going from behind the flex fan to the radiator to help channel air? Also, I think that I might need to bleed air out of the cooling system. Could this be adding to the overheating?
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Old 08-27-2007, 11:46 PM   #4
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Quote:
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Should there be something (a shroud) going from behind the flex fan to the radiator to help channel air?
EXACTLY, that ur problme if you dont have one!!!!!

let me find a pic of a jeep engine compartment one sec
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Old 08-27-2007, 11:48 PM   #5
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Old 08-27-2007, 11:50 PM   #6
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btw if it is the first time u have gotten it up to temp it may squirt out some water if it was filled

bleed air out of the cooling system??? never heard of that before, the water will expand and shouold push the air out, maybe once you get it to the right temp you wil add some water so that there is barely any air in the system when it is hot
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Old 08-28-2007, 12:14 AM   #7
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also if its blowing it out the overflow check to see if your upper radiator hose is hot if it is when the jeeps been running for a while your good if not look into a thermostat
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Old 08-28-2007, 07:11 AM   #8
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This is a picture of one that looks like it is set up a bit like mine. Does the shrowd mount on the radiator and basically reach out and surround the flex fan? Anyone have any pictures of how it looks with a shroud? I'll check the temperature of the radiator hoses either later today or tomorrow as well. Thanks!
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Old 08-28-2007, 03:00 PM   #9
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Sometimes you may have to bleed air out of the waterpump. Once in a great while a buble will get trapped in the pump and it will not prime. If that is the case then you are not moving any coolant and it may overheat. Doubt this is the problem though.
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Old 08-29-2007, 11:27 AM   #10
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yes the shroud goes from the rafiator (square part in the ebay picture) right up to the fan, so that ALL the air the fan is sucking has to go thoguh the radiator

right now the air is taking the path of least resistance which is AROUND the radiator

so that sohuld solve your problme

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