over heating problems. need help. - Page 2 - JeepForum.com
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post #16 of 25 Old 05-20-2013, 12:46 PM Thread Starter
jesseg
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1997 ZJ 
 
Join Date: Nov 2011
Location: concord
Posts: 27
The motor is timed correctly and the carb is tuned great. Runs great on the trail but as soon as I let it idle or start crawling the temp jumps extremely high.


Semper Fi
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post #17 of 25 Old 05-20-2013, 12:49 PM Thread Starter
jesseg
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1997 ZJ 
 
Join Date: Nov 2011
Location: concord
Posts: 27
Wellmax

Yes I custom fabricated a shroud it has no holes in it it completely covers the whole radiator

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post #18 of 25 Old 05-20-2013, 08:36 PM
82JeepCJ7
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1982 CJ7 
 
Join Date: Jun 2010
Location: Marysville, WA
Posts: 5,416
You need more low speed air flow. Get a shroud.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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post #19 of 25 Old 05-20-2013, 09:43 PM
lucdog
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1980 CJ5 
 
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What exact fan are you using? If the blades flex to much they won't pull any air. As a test, run the engine at 1500 RPM's with the hood up. Use you hand on the carb to hold the RPM's, watch the fan blades , and feel for air flow with the other hand. If the air flow slows (decreases) from idle, a non Performance fan would be my next step.

Bill

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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post #20 of 25 Old 05-21-2013, 12:03 AM Thread Starter
jesseg
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1997 ZJ 
 
Join Date: Nov 2011
Location: concord
Posts: 27
I just bought a new fan that supposedly pulls more air at low rpm's. I'm going to see if that works.

Semper Fi
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post #21 of 25 Old 05-21-2013, 09:44 AM
braguenavy
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1984 CJ7 
 
Join Date: Apr 2013
Location: montoursville
Posts: 11
You could probably find a pusher fan to mount in front of your radiator, between the radiator and the grille.
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post #22 of 25 Old 05-21-2013, 07:57 PM
lonetrader
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1975 CJ5 
 
Join Date: Sep 2012
Location: Pahrump
Posts: 36
What temps do you consider too high. What is your normal operating temp? Your normal op temp should be around 190. 220 is acceptable when running slow. What about a solid 6 blade 17" fan.
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post #23 of 25 Old 05-21-2013, 10:40 PM Thread Starter
jesseg
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1997 ZJ 
 
Join Date: Nov 2011
Location: concord
Posts: 27
At high rpm's the temp is at 215 at idle or a slow crawl it jumps to 250-260 almost instantly. And regarding the pusher fan I have almost no room in between the grill and radiator I have 1 and 3/4 inch and in between the fan and radiator I only have about an inch. I got a new low rpm fan and I bought some liquid for the radiator that supposedly drops temp by 20. I'm going to see if this works.

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post #24 of 25 Old 05-23-2013, 05:04 PM
lonetrader
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1975 CJ5 
 
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Location: Pahrump
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How about a pic or 2 of fan shroud and fan, front of jeep. Your custom shroud could be the problem. Remove it and compare your temps. Do you have an automatic trans? If it connects to the radiator that could be a partial problem. Hook your trans up to a cooler direct bypassing the radiator. I am thinking your shroud is the problem.
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post #25 of 25 Old 05-23-2013, 07:38 PM
LumpyGrits
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1985 CJ7 
 
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Location: The Mojave Desert - Palmdale, Ca. U.S.A.
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You more than likely will need to put vents in the hood so the engine bay can 'dump' the hot air that is trapped with the larger engine.
How much room do you have in front of the rad for a 'pusher' fan?
LG
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