360 Fan Shroud, 360?

[graham]

It's hot, and I have a minor cooling problem. May be due for a new water pump :( .
While doing a few checks I noticed that there's no shroud covering the bottom 1/4 of the fan. Should the shroud cover 360* of the fan?

[GT71Wagoneer]

Hi mate, Geoff here, mine too has been running a bit hot, I think we should just put it down to the 40 deg celcius days we have been having, but having said that I went and purchased a new water poump just incase, I have not fitted it yet as no need.

Seeya mate.

[Mud Thrasher]

yeah i would say that you would need it all the way around cause if not then it wouldnt direct as much air. you would be losing volume and pressure out the bottom. Look at any other car and they have a full fan shroud.

[TPICherokee]

In case you are wondering, I have those fan shrouds in stock and I will ship to Australia. They are usually $100, but this month IFSJA members get 20% off so your price is $80. Thanks!

Brent
BJ's Off-Road
www.bjsoffroad.com (http://www.bjsoffroad.com)
(253) 265-6678

[graham]

Thanks Brent, If I can't find any thing local...You'll be the first to know.

[Woody Mammoth]

graham, love those Bull Bars. You got to mentioned that in your sig. BTW, is the Bull Bar fit onto customer front bumper? or is it a single unit?

[reddog]

The stock shroud on my 87 does not go 360 degrees around the fan. It is open about 60 degrees on the bottom.

Kerry

[graham]

Originally posted by Woody Mammoth:
graham, love those Bull Bars. You got to mentioned that in your sig. BTW, is the Bull Bar fit onto customer front bumper? or is it a single unit?Woody, To fit the Bull Bar the original bumper and mounting brakets have to be removed. The Bull Bar has it own mounting brackets onto the chassis.

[graham]

Originally posted by reddog:
The stock shroud on my 87 does not go 360 degrees around the fan. It is open about 60 degrees on the bottom.KerryTanks Kerry, I thought mine might have been missing a piece, but not if yours is open 60* at the bottom. I will try and close of the bottom section. It seems to pull air in from there and not thruogh the radiator as it should.

[andy d]

uhhmn, i sure the factory shroud can be improved upon. imho, its primary function is to limit liability in case some dimwit tried to stick his hand in there whilst the engine was turning. 40c is about 105 F. hows the radiator cap and the system in general? hows the circulation? what do you run for a coolant mix? what does your water do to diecast aluminum? i had a re-manned engine put in and the original pumps impeller had worn considerably. no leaks, no noises,but not much flow. air flow is a another easy thing
to help by blowing the fins out with air. as always try the easy cheap stuff first :D . frankly im jealous, i could use some dry heat about now. as soon as i send this post, im off to play with my bmws in 25f snow. thats why this post is so long :D

[graham]

Andy, Cooling system, in general terms is fine. Use a corrosion inhibertor thats suitable to iron and aluminium. Fins on both raditators are clean. One of the first jobs I did on the Jeep.
Since I fitted driving lights to the bull bar, this has reduced air flow abit, as they sit right in the middle of the radiator. But I think if the shroud went 360* it would improve the airflow thru the radiator. Might even have to add some more 'Toyota Juice' to the clutch fan.

off to play with my bmws in 25f snow. thats why this post is so long
Hope its atleast warmed your fingers up ;)

[ December 29, 2002, 07:47 AM: Message edited by: graham ]

[coolram]

The stock shrouds like everyone has said are open on the bottom.One reason the shroud is left open is air flow in the engine compartment.When was the last time you flushed the complete system?May have an air pocket.Also you might have a faulty t-sat.Iv'e been using the Robert Shaw t-stats(180F) that open with the flow(also if it fails it does so in the open position).I haven't had a problem(fingers crossed)with one yet.When you mention "toyota juice" are you thinking of an electric fan used as a pusher in front of the radiator?

[lindeleasley]

imho, its primary function is to limit liability in case some dimwit tried to stick his hand in there whilst the engine was turning. Gee...and I always thought it's primary purpose was to break, since it does that so well! ;)

[graham]

Originally posted by coolram:
[QUOTE]The stock shrouds like everyone has said are open on the bottom.One reason the shroud is left open is air flow in the engine compartment.I feel the air would flow would be the same with shroud is open or closed.

When was the last time you flushed the complete system?May have an air pocket.Always flush it before every summer, could have an air lock, but I dont believe it has. How can you tell if it has?

Also you might have a faulty t-sat.Theromsat could be the cause, Will have to pull it and check it.

When you mention "toyota juice" are you thinking of an electric fan used as a pusher in front of the radiator?"Toyota Juice" is something Andy D named the silcone oil that can be bought from Toyota. Its used by Toyota to refill their clutch fans. I've used it to refill the clutch fan on the Jeep. There's a 'how to' on my web page.

[ December 30, 2002, 08:04 AM: Message edited by: graham ]

[Dan G]

Graham,

Went looking for the how to on the fan clutch. I found my way to your continent this summer but I can't seem to find my way to that link...

So, do you have a snorkel on your FSJ like every other Greg, Murray and Jeff over there on the warm side of the world?

[graham]

Originally posted by Dan G:
Graham,
Went looking for the how to on the fan clutch. I found my way to your continent this summer but I can't seem to find my way to that link...
So, do you have a snorkel on your FSJ like every other Greg, Murray and Jeff over there on the warm side of the world?Gotta do abit of bearhunting to find the bear that links to tech page.

Tech Page (http://www.geocities.com/ozbearhunter/TECHNICAL.html)

No snorkel yet, but working on some ideas. Sure would help to get cool air into the motor.

[BIG BAD JON]

Graham, heres an idea Ive been working on:

Try moving the air induction from on top of the carb to the little grille between your hood and your windshield used to pull in air for your cab ventillation system. Its high, and there is a ram-air effect goin on there! Think about it.

[Don S]

Originally posted by graham:
It's hot, and I have a minor cooling problem. May be due for a new water pump :( .
While doing a few checks I noticed that there's no shroud covering the bottom 1/4 of the fan. Should the shroud cover 360* of the fan?..
graham:...
I will vote for a 360 degree fan shroud.
I talked to an old-head radiator man that told me about radiator paint. He said he used a special paint because most paint is an insulator and willnot pass the BTUs very well. Many people spray paint under the hood including radiator cores to make them look nice. As the paint starts to oxidize it becomes a stronger barrier to the cute bugger thermal thingies.

That bear might need some sheep shearing to be cool.. http://www.colorado4x4.org/ubb/graemlins/spit.gif…
link> OVERHEATING 101 (http://groups.msn.com/JEEPTECH101/jeeptech.msnw)
Good Luck http://www.michiganjeepers.com/forums/images/graemlins/wave.gif and CUL ;) … ds..
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[ January 01, 2003, 01:10 PM: Message edited by: Don S ]

[graham]

Originally posted by BIG BAD JON:
Graham, heres an idea Ive been working on:

Try moving the air induction from on top of the carb to the little grille between your hood and your windshield used to pull in air for your cab ventillation system. Its high, and there is a ram-air effect goin on there! Think about it.I like you idea, will invetigate the possiblities.
Please let me know of you progress.