Radiator Fitment / Gap between radiator and front grill - JeepForum.com
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post #1 of 24 Old 10-10-2011, 05:28 PM Thread Starter
GlennLever
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Radiator Fitment / Gap between radiator and front grill

One of the upgrades I did/installed this weekend was a SPECTRA PREMIUM Part # CU583 15-7/8" Between Tanks; Heavy Duty Cooling Radiator.

I installed it and noticed that there is quite a gap between the radiator and the front grill.

I checked the old radiator and it fit just the same (it was a standard radiator with only two rows).

The outside dimensions of both radiators are the same.

I had also purchased a fan shroud, but when I went to install it, it did not fit by the amount of the gap that is in front of the radiator. In other words if the radiator was forward by the amount of gap that is in front of the radiator the shroud would fit.

I could modify this radiator to move it forward, but before I do that I would like to see some pictures of other (1984 CJ-7) Jeep radiators and the gaps between the radiator and the grill. Maybe I just need to order a different fan shroud in order to get it to fit??

One other comment is the preformed radiator hoses fir perfect. If the radiator was further forward they would not have fit as nice, particularly the lower hose.

This is the shroud that I ordered. OEM Radiator Shroud
For 81-86 Jeep® CJ 6CYL with Heavy Duty Cooling
Quadratec Part No: 51218.101
Manufacturer Part No: 17102.02


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Glenn R. Lever
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post #2 of 24 Old 10-10-2011, 06:42 PM
SJ85CJ7
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I went thru the samething when I replaced my radiator, first was your radiator cap centered or offset to the drivers side? My radiator I replaced had the cap offset to drivers side and I saw that the brackets that hold the radiator to the grill were set so the radiator would sit forward so there was no gap, my new one had shorter brackets so I have the gap as you do and my fan is very close to the point I had to shim it towards the engine so it wouldn't hit.

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post #3 of 24 Old 10-10-2011, 06:45 PM
Bakunin
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I'd like to see you ditch that flex fan. Those rob you of HP and gas mileage, and if you hit a good body of water, they can shred your radiator for you.


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post #4 of 24 Old 10-10-2011, 06:55 PM Thread Starter
GlennLever
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Quote:
Originally Posted by Bakunin View Post
I'd like to see you ditch that flex fan. Those rob you of HP and gas mileage, and if you hit a good body of water, they can shred your radiator for you.
I'm looking for a stock fan.

I'm not sure of the robbing of HP and mileage. The whole point of a flex fan is as the RPM's go up the fan flatens out, as you go faster there is less need to pull air through the radiator as the speed of the vehicle fources air through the radiator. As the fan flatens it takes less HP to drive it.

Glenn R. Lever
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post #5 of 24 Old 10-10-2011, 06:56 PM Thread Starter
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Quote:
Originally Posted by SJ85CJ7 View Post
I went thru the samething when I replaced my radiator, first was your radiator cap centered or offset to the drivers side? My radiator I replaced had the cap offset to drivers side and I saw that the brackets that hold the radiator to the grill were set so the radiator would sit forward so there was no gap, my new one had shorter brackets so I have the gap as you do and my fan is very close to the point I had to shim it towards the engine so it wouldn't hit.

The cap on the originial ratiator was also in the center.

Glenn R. Lever
Rochester, New York 14617-2012
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post #6 of 24 Old 10-10-2011, 07:05 PM
mopar346
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Picks up HP over a fixed fan but is not as efficeint as a clutch fan. They are a carry over from before clutch fans. They actually flaten out when revved and return to basic form at constant RPMs, not quite as much as sitting idle but fairly close. It's like a switch in the power to your alternator, it drags more when generating electricity and just works like a idler pulley when not powered up.

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post #7 of 24 Old 10-10-2011, 08:44 PM
lucdog
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Quote:
Originally Posted by GlennLever

I'm looking for a stock fan.

I'm not sure of the robbing of HP and mileage. The whole point of a flex fan is as the RPM's go up the fan flatens out, as you go faster there is less need to pull air through the radiator as the speed of the vehicle fources air through the radiator. As the fan flatens it takes less HP to drive it.
A flex fan like mentioned sucks on the trail.
My experience, 4 wheel low, 1st gear (4 to 1) 1500 to 1600 RPM's. The fan would "flatten out", not move much air, causing temps to rise.
On the road it was fine. Changed to a clutch fan, temps don't raise.

Bill

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post #8 of 24 Old 10-10-2011, 09:17 PM
carnell
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I'm in the same boat as you. I upgraded to a 3 row and and now I have a huge gap in the front. I had no choice but to go to a flex fan. When you find the fix, let me know!!
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post #9 of 24 Old 10-10-2011, 09:24 PM
Erik719
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Me too. I made some pieces to cover the gap in the hopes of improving air flow. I will post some pics tomorrow.

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post #10 of 24 Old 10-10-2011, 09:28 PM Thread Starter
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Quote:
Originally Posted by lucdog View Post
A flex fan like mentioned sucks on the trail.
My experience, 4 wheel low, 1st gear (4 to 1) 1500 to 1600 RPM's. The fan would "flatten out", not move much air, causing temps to rise.
On the road it was fine. Changed to a clutch fan, temps don't raise.

Bill
Excatly correct. That is why I am looking for a stock fixed fan. It gives up HP, but it cools much better at low speed highr RPM's.

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post #11 of 24 Old 10-10-2011, 09:56 PM
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I believe that is the same radiator I have. My Clutch fan would not fit with it. I have a stock fixed 4 blade on it now. I'm not sure if a shroud would fit or not. the fixed 4 blade seems to move allot of air though. Also fitment with my recent power steering up grade was annoying in the hose, steering shaft and pressure line department. every thing was VERY tight.
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post #12 of 24 Old 10-10-2011, 10:01 PM Thread Starter
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Quote:
Originally Posted by spottedfrog View Post
I believe that is the same radiator I have. My Clutch fan would not fit with it. I have a stock fixed 4 blade on it now. I'm not sure if a shroud would fit or not. the fixed 4 blade seems to move allot of air though. Also fitment with my recent power steering up grade was annoying in the hose, steering shaft and pressure line department. every thing was VERY tight.
This radiator fits perfect with the gear box and P/S Hoses.
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post #13 of 24 Old 10-10-2011, 10:05 PM Thread Starter
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To get a shroud to fit I may have to cut up the leading edges of the shroud.

The Shroud is an important part of the cooling of the engine.

Glenn R. Lever
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post #14 of 24 Old 10-10-2011, 10:05 PM
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The rad looks about right. The rear should be flat with the metalwork that it bolts to. The shroud then bolts on to the same mounting bolts.

The shroud is not supposed to be passed in front of the fan, it should be inserted down the back then bolted on around the fan. An alternative, though fiddly, is to put on the shroud and fan in one go, but it makes it a bit more fiddly to get to the fan pulley bolts.

Have you got a picture of the shroud you are tring to fit?

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post #15 of 24 Old 10-10-2011, 10:11 PM Thread Starter
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Quote:
Originally Posted by BagusJeep View Post
The rad looks about right. The rear should be flat with the metalwork that it bolts to. The shroud then bolts on to the same mounting bolts.

The shroud is not supposed to be passed in front of the fan, it should be inserted down the back then bolted on around the fan. An alternative, though fiddly, is to put on the shroud and fan in one go, but it makes it a bit more fiddly to get to the fan pulley bolts.

Have you got a picture of the shroud you are tring to fit?
I did not take a picture, wish I had. The problem with the fitment is when the shroud is placed against the radiator there is a 1/2 inch gap between the edge off it and the radiator support where it wants to be bolted.

You cannot use the same bolts that hold the radiator in place because of this gap.

Everything lese lines up including the bolt holes in the shroud. They are just a 1/2 inch away from the radiator support.

I guess I could put in some spacers to make that work, but that would allow a lot of air to be sucked around the radiator rather than through it.

Glenn R. Lever
Rochester, New York 14617-2012
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