Easy to miss this.....
06-21-2018, 01:09 PM
#1
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Year: 1992
Model: Cherokee
Engine: 4.0
Easy to miss this.....
i know this subject has probably been discussed numerous times, but since there are over 950,000 comments in this section, i thought i would start another thread about it, since it is now summer.....
As is always the case with an XJ, engine temperature is an issue.....i can only speak for the six cylinder, but it seems that most xj that have made it this long, have the 4.0.....
i am a guru for clean oil, and keeping temperatures down.....my jeep has never overheated, but in certain situations, it would certainly trigger the auxiliary fan.....this would always keep it from overheating, but it seemed to hover around temperatures too high for my liking....
i have big Ford E-350 vans for my business use....over the years i have found it necessary to replace the engine driven fan clutch numerous times.....there is no better way to cool an engine, than that setup.....
But on the Jeep , it has the auxiliary fan, that prevents overheating, and therefore it is very easy to overlook the engine driven clutch fan.....but i knew i was not hearing that fan, at cold start up, or any other time.....
So i replaced the clutch, and instantly the issue was solved, and, i noticed how much cooler the engine bay was staying, and as a result, the hood does not get nearly as hot. This is a big deal, as i am ready to paint the jeep, but did not want to cook the new paint!
Fan clutches age, they are subject to fatigue, they stop working as well over time, and it is always a good idea to keep it fresh, and keep that motor cool!
As is always the case with an XJ, engine temperature is an issue.....i can only speak for the six cylinder, but it seems that most xj that have made it this long, have the 4.0.....
i am a guru for clean oil, and keeping temperatures down.....my jeep has never overheated, but in certain situations, it would certainly trigger the auxiliary fan.....this would always keep it from overheating, but it seemed to hover around temperatures too high for my liking....
i have big Ford E-350 vans for my business use....over the years i have found it necessary to replace the engine driven fan clutch numerous times.....there is no better way to cool an engine, than that setup.....
But on the Jeep , it has the auxiliary fan, that prevents overheating, and therefore it is very easy to overlook the engine driven clutch fan.....but i knew i was not hearing that fan, at cold start up, or any other time.....
So i replaced the clutch, and instantly the issue was solved, and, i noticed how much cooler the engine bay was staying, and as a result, the hood does not get nearly as hot. This is a big deal, as i am ready to paint the jeep, but did not want to cook the new paint!
Fan clutches age, they are subject to fatigue, they stop working as well over time, and it is always a good idea to keep it fresh, and keep that motor cool!
06-23-2018, 10:31 AM
#3
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Year: 1992
Model: Cherokee
Engine: 4.0
06-23-2018, 11:09 AM
#5
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Year: 97
Model: Cherokee
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Fired up a new high performance engine in a model A rod for a customer one time. I had not hooked up the tailpipes to the header collectors yet. For some reason before I could stop him he reached down and grabbed the fan to stop the engine "because it was too loud". Yep... Blood all over the shop and his freshly painted and detailed new chrome engine.
What possessed him I have no clue... This is why you don't let customers in the shop area. Let them take it home and grab fan blades if they need to...
What possessed him I have no clue... This is why you don't let customers in the shop area. Let them take it home and grab fan blades if they need to...
06-23-2018, 12:04 PM
#6
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Year: 1997
Model: Cherokee
Engine: 4.0L
Fired up a new high performance engine in a model A rod for a customer one time. I had not hooked up the tailpipes to the header collectors yet. For some reason before I could stop him he reached down and grabbed the fan to stop the engine "because it was too loud". Yep... Blood all over the shop and his freshly painted and detailed new chrome engine.
What possessed him I have no clue... This is why you don't let customers in the shop area. Let them take it home and grab fan blades if they need to...
What possessed him I have no clue... This is why you don't let customers in the shop area. Let them take it home and grab fan blades if they need to...
06-23-2018, 12:31 PM
#7
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Year: 97
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Lol... On the customer's part yes... Caused me to change my whole business policy about allowing customers in the shop. He was well known and wanted to "be there" when I cracked it for the first time and I was compassionate enough to understand this because it is always exciting and it was his Rod. But never again after that... 
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06-24-2018, 08:11 AM
#8
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
i know this subject has probably been discussed numerous times, but since there are over 950,000 comments in this section, i thought i would start another thread about it, since it is now summer.....
As is always the case with an XJ, engine temperature is an issue.....i can only speak for the six cylinder, but it seems that most xj that have made it this long, have the 4.0.....
i am a guru for clean oil, and keeping temperatures down.....my jeep has never overheated, but in certain situations, it would certainly trigger the auxiliary fan.....this would always keep it from overheating, but it seemed to hover around temperatures too high for my liking....
i have big Ford E-350 vans for my business use....over the years i have found it necessary to replace the engine driven fan clutch numerous times.....there is no better way to cool an engine, than that setup.....
But on the Jeep , it has the auxiliary fan, that prevents overheating, and therefore it is very easy to overlook the engine driven clutch fan.....but i knew i was not hearing that fan, at cold start up, or any other time.....
So i replaced the clutch, and instantly the issue was solved, and, i noticed how much cooler the engine bay was staying, and as a result, the hood does not get nearly as hot. This is a big deal, as i am ready to paint the jeep, but did not want to cook the new paint!
Fan clutches age, they are subject to fatigue, they stop working as well over time, and it is always a good idea to keep it fresh, and keep that motor cool!
As is always the case with an XJ, engine temperature is an issue.....i can only speak for the six cylinder, but it seems that most xj that have made it this long, have the 4.0.....
i am a guru for clean oil, and keeping temperatures down.....my jeep has never overheated, but in certain situations, it would certainly trigger the auxiliary fan.....this would always keep it from overheating, but it seemed to hover around temperatures too high for my liking....
i have big Ford E-350 vans for my business use....over the years i have found it necessary to replace the engine driven fan clutch numerous times.....there is no better way to cool an engine, than that setup.....
But on the Jeep , it has the auxiliary fan, that prevents overheating, and therefore it is very easy to overlook the engine driven clutch fan.....but i knew i was not hearing that fan, at cold start up, or any other time.....
So i replaced the clutch, and instantly the issue was solved, and, i noticed how much cooler the engine bay was staying, and as a result, the hood does not get nearly as hot. This is a big deal, as i am ready to paint the jeep, but did not want to cook the new paint!
Fan clutches age, they are subject to fatigue, they stop working as well over time, and it is always a good idea to keep it fresh, and keep that motor cool!
06-24-2018, 03:31 PM
#9
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Year: 97
Model: Cherokee
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I am glad to see this little quirk addressed... It is something that has been bugging me since I have owned mine. Even with a 165 degree stat these still run HOT up to 210. I am sure they were trying to reduce emissions output by making these run right up to the breaking point as to run cleaner. But the old AMC's would stay down at 165 with a thermostat rated at that temp so what is different?
I didn't really have anything to reference my head and block to when I had it off, but I wonder if the port casting in the block, head and gasket porting could be creating this difference? I remember we used to cut and drill stuff bigger or add ports in the proper places to make chevy engines and some chryslers run cooler back in the day for racing. I wonder if this might have something to do with this?
Maybe there could be an improvised head, block, gasket set up to make these run cooler? We really could use that out here in the desert... Why keep it right on the edge of destruction all the time? especially when we are out crawling in the summer. Every little bit helps in our extreme environment...
I think good cooling should start at the source of what requires to be cooled. right?
I didn't really have anything to reference my head and block to when I had it off, but I wonder if the port casting in the block, head and gasket porting could be creating this difference? I remember we used to cut and drill stuff bigger or add ports in the proper places to make chevy engines and some chryslers run cooler back in the day for racing. I wonder if this might have something to do with this?
Maybe there could be an improvised head, block, gasket set up to make these run cooler? We really could use that out here in the desert... Why keep it right on the edge of destruction all the time? especially when we are out crawling in the summer. Every little bit helps in our extreme environment...
I think good cooling should start at the source of what requires to be cooled. right?
06-24-2018, 07:06 PM
#10
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Year: 96
Model: Cherokee (XJ)
Engine: 4.0
165F is too low imo, and greatly increased bore wear results
there are charts that show engine life vs temp
I have seen 4.0 engines with +300k km, and they did not need cylinder bore
it can be very hot 40C+ where I live
The only way I can get my e-fan to turn on is idle for 30mins in hot weather, brings the gauge back from 105C to 100C
peak torque at low speed for protracted periods in hot, would probably do it too, havent experienced it since my new rad
06-24-2018, 07:20 PM
#11
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Join Date: May 2015
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Year: 97
Model: Cherokee
Engine: 4.0
165F is too low imo, and greatly increased bore wear results
there are charts that show engine life vs temp
I have seen 4.0 engines with +300k km, and they did not need cylinder bore
it can be very hot 40C+ where I live
The only way I can get my e-fan to turn on is idle for 30mins in hot weather, brings the gauge back from 105C to 100C
peak torque at low speed for protracted periods in hot, would probably do it too, havent experienced it since my new rad
there are charts that show engine life vs temp
I have seen 4.0 engines with +300k km, and they did not need cylinder bore
it can be very hot 40C+ where I live
The only way I can get my e-fan to turn on is idle for 30mins in hot weather, brings the gauge back from 105C to 100C
peak torque at low speed for protracted periods in hot, would probably do it too, havent experienced it since my new rad
For some reason it is staying in the block and head too long...
Last edited by Bugout4x4; 06-24-2018 at 07:23 PM.
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