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Unread 07-05-2013, 11:07 AM   #1
kurty65
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1983 CJ7 
 
Join Date: Jan 2012
Location: Hingham, MA
Posts: 28
Clutch fan vs. no clutch fan

Ok, today is the day that I'm dedicating the whole day to working on the jeep (1983 CJ 7) , even though its hot as hell out.
While mounting the nose on, I noticed the radiator is hitting the fan clutch, so do I get rid of the clutch and fan and just go with fan or do I keep it and change out the radiator? Thanks Kurt

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Unread 07-05-2013, 11:19 AM   #2
spottedfrog
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1979 CJ5 
 
Join Date: Sep 2010
Location: Grand Junction, Colorado
Posts: 833
I had the same issue. I went with the non-clutch fan. I have no over heat issues.
The non-clutch fan is a different fan
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Unread 07-05-2013, 11:37 AM   #3
only in a jeep cj
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1986 CJ7 
 
Join Date: Jun 2001
Location: Mobile, Alabama
Posts: 4,229
There seems to be a lot of confusion when people try to replace cooling system parts on our older Jeeps. It's not just swapping out one part with a different type as fittment and compatibility come into play. The three major factors is depth of water pump/ pulley combo, fan clutch or fixed fan, and radiator depth and shroud. All three need to match in order to work together with proper spacing.
If your radiator is hitting or too close to the clutch, I would guess your either have a fan clutch when you shouldn't OR you have a radiator for a fixed fan system when you should have a deeper offset one for the clutch. Do you have a shroud? Those are mainly used and come with the fan clutch system
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Ed

1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon
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Unread 07-05-2013, 11:50 AM   #4
kurty65
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1983 CJ7 
 
Join Date: Jan 2012
Location: Hingham, MA
Posts: 28
I have both options, I have an offset radiator, but it still needs to be flushed and tested. The fatter radiator is all ready to go, so I was wondering if I should stick with that or take the time and use the offset radiator. Is one better than the other when it comes to keeping the engine cooled down.
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Unread 07-05-2013, 11:59 AM   #5
texas1al
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1984 CJ7 
 
Join Date: Mar 2013
Location: Arlington, VA
Posts: 62
Cheaper fix is to go with a fixed 4-blade fan, but the clutched fan is supposed to be more efficient. It only spins at full force when needed and won't continuously fight the incoming air at highway speed. I originally had the fixed fan and 3-core center cap radiator on my truck and converted it to a clutched fan and 2-core offset cap radiator. No real difference in cooling performance from what I can tell. Only difference is sound - no more famous fan whine (a la Mash Jeeps). I suppose it's helped my mileage too, but I really only did it to modernize things since I was replacing the radiator anyway. As Ed said, the clutched setup is designed to be paired with a different shroud and the thin and dense 2-row radiator with the cap offset to the driver's side and those aren't cheap. That style radiator will have brackets that position the radiator deeper into the grill to provide the extra space for the clutch.
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Unread 07-05-2013, 12:21 PM   #6
only in a jeep cj
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1986 CJ7 
 
Join Date: Jun 2001
Location: Mobile, Alabama
Posts: 4,229
My personal preference is the fixed 4 blade. It also uses a small aluminum spacer for those that don't know. I use an aftermarket 3 core center cap radiator and no shroud. Wind flow through at high speed is fine, cooling is constant, and no real fan noise.
I guess I've seen clutches crap out and don't like the weak link ( as I view it)
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Ed

1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon
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Unread 07-05-2013, 12:28 PM   #7
kurty65
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1983 CJ7 
 
Join Date: Jan 2012
Location: Hingham, MA
Posts: 28
Well I think I will send the 2 core radiator out to be tested and hope its good, because I already have the clutch and fan mounted on the motor. If it doesn't pass the test, then I'll go back to the original radiator and no clutch fan. Thanks for all the help guys, I'm sure ill be back with more ?'s Kurt
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