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Old 02-28-2011, 01:34 PM   #1
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Removing Mechanical Fan

2005 Jeep Wrangler Rubicon with the 4.0. I am trying to install an electric fan on the Jeep hoping to free a little HP and MPG. I have been reading online which way the "big nut" (for lack of a better term) on the shaft is supposed to turn in order to break it loose and remove the fan and clutch as an assembly. I have seen people say that it goes both ways though. I even saw one diagram that said to put the fan wrench on and tap it with a hammer from the right side (when looking at the front of the vehicle), and then showed the guy hitting it from the left side.

I just don't want to hit it the wrong way and get it so tight that it never comes off and I end up having to replace the water pump to switch to an elec. fan. Any help is appreciated!

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Old 02-28-2011, 01:45 PM   #2
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I'm not sure of which direction to spin it... I'll be finding that out in a few months when I get to do this mod, but I know pulling a fan off another motor we had to use a hammer to hit a wrench to impact the fan loose. after that if unthreaded by hand.

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Old 02-28-2011, 01:55 PM   #3
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Dont think you are going to be saving much... really the only good thing you benefit from with an electrical fan is that you can turn it off when you are fording...

(sorry i know this doesnt help your question)
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Old 02-28-2011, 02:02 PM   #4
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All you need is a big/long enough adjustable wrench (12"+). Hold it in the vertical position and give it a goo whack towards the passenger side and it shouled break loose. (leave the belt on when you hit it.)
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Old 02-28-2011, 02:03 PM   #5
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Quote:
Originally Posted by KawiMonsterSahara View Post
Dont think you are going to be saving much... really the only good thing you benefit from with an electrical fan is that you can turn it off when you are fording...

(sorry i know this doesnt help your question)
I agree, someone is feeding him some bad info. But then there seems to be a lot of bad word of mouth info out there.
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Old 02-28-2011, 02:25 PM   #6
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I bought a 66 Mustang that had a brand new 16" shrouded fan and all the wiring, thermostat, etc. It's not costing me anything to go this route. If it was, I wouldn't be doing it.


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Old 02-28-2011, 02:42 PM   #7
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Is it worth putting on an electric fan or leave the stock clutch fan on? I was just getting ready to buy one on ebay and change out this weekend.
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Old 02-28-2011, 02:52 PM   #8
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IMO... NO... keep the stock fan
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Old 02-28-2011, 03:10 PM   #9
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If it gave significant MPG increase Chrysler would have done it since the more it gets the more they would advertise it.
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Old 02-28-2011, 03:25 PM   #10
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Its your call cause its your rig. I have one for mine off of a ford taurus and ill be putting it on in the spring. Some ppl on this forum don't like em but I do and have had them on many vehicles that I've own.some from the factory (2004 tahoe and 2010 v6 mustang have them) and some that I installed myself. Jp magazine has a write up them check it out
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Old 02-28-2011, 03:37 PM   #11
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I get 12 MPG now .. If I can do something for free that picks me up .2 I will take it! :-D It can't hurt anything!
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Old 02-28-2011, 04:00 PM   #12
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No it can't hurt anything. This is a cheap power adder. All you hear is when you want to do a lift and 35s is you need 4.56 or 4.88 gears and lockers add rear disc brakes well I say bs. I ve been on 35s for a little over a year now with 3.73s and I've been getting around fine and when I get the money ill do gears cause lord knows it needs it but if I can add a few things for cheap power then why not put on an electric fan.im not saying its kick you in the seat power but every little bit helps. This for me like alot of us is build as you go
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Old 02-28-2011, 04:01 PM   #13
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Which direction does your fan spin when you are standing in front of your Jeep looking towards the back? If it spins to the right your going to turn the nut to the right and vice versa for the left. It spins the fan so the nut will always spin in the direction that tightens it.
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Old 02-28-2011, 04:04 PM   #14
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Check this out... Fan Debate
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Old 03-01-2011, 07:40 AM   #15
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The whole water pump pulley turns .. the belt doesn't but the pulley does. Any thoughts?
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Old 03-01-2011, 07:45 AM   #16
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Dam man my 98 has 4 nuts that hold my fan assembly on. Not 1 BIG nut
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Old 03-01-2011, 08:17 AM   #17
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Quote:
Originally Posted by just4fun
Dam man my 98 has 4 nuts that hold my fan assembly on. Not 1 BIG nut
Nope if you look right where the fan connects to the water pump you'll see a hex shaped shaft from the pump to the fan. That is the big nut I am talking about. It is threaded onto a shaft from the water pump pulley.
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Old 03-01-2011, 08:38 AM   #18
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Im glad I have an older tj with a 4.0. last summer I changed water pump and all I had is the 4 studs comen from water pump that hold my fan on. And my 96 xj is the same way
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Old 03-01-2011, 10:13 AM   #19
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Thanks for the input. I'm going to change it out and will post a new thread after to let you know how it performed.
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Old 03-01-2011, 10:24 AM   #20
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Quote:
Originally Posted by bkcmsu View Post
The whole water pump pulley turns .. the belt doesn't but the pulley does. Any thoughts?

Are you hitting the wrench with a hammer?
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Old 03-02-2011, 10:05 AM   #21
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Yes sir. I tried tapping it and smacking the shit out of it .. LOL .. got nothing. Any thoughts?
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Old 03-02-2011, 10:12 AM   #22
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I bought a pneumatic fan clutch wrench set. It makes quick work of removing a fan with an air hammer. It's kind of pricey but being a mechanic I figured using it once would pay for itself. Here is a set that is exactly like mine. Pneumatic Fan Clutch Wrench Set
I'm not sure what brand mine is but it looks exactly like the one I posted.
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Old 03-02-2011, 12:23 PM   #23
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I appreciate everyone's input, but my problem is not getting to the shaft, or turning the shaft. It is keeping everything else from turning in the process. Anyone else run into this problem?
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Old 03-02-2011, 12:31 PM   #24
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Quote:
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I appreciate everyone's input, but my problem is not getting to the shaft, or turning the shaft. It is keeping everything else from turning in the process. Anyone else run into this problem?
Yes. We had the same problem. that is why it was to be impacted off. There isn't a good way (that I've found) to hold the pully. So its all about being able to smack that wrech with a hammer enough so the inertia will loosen it, and after we broke it loose it came off real easy.
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Old 03-02-2011, 06:17 PM   #25
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Dumb question but have you thought about a fan clutch spanner? It holds the pulley while you turn the nut. Didn't read all of the posts so I don't know if it was suggested yet. Also, the 4 bolts hold the pulley on, not the fan on later models I suppose.
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Old 03-02-2011, 06:34 PM   #26
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Nope if you look right where the fan connects to the water pump you'll see a hex shaped shaft from the pump to the fan. That is the big nut I am talking about. It is threaded onto a shaft from the water pump pulley.
He won't see it. Think its 2000-06.
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Old 03-02-2011, 09:37 PM   #27
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He won't see it. Think its 2000-06.
He should then. He's got an '05'.
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Old 03-03-2011, 07:44 AM   #28
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Mine has 4 bolts that hold the fan to the fan clutch, 4 bolts that hold the pulley to the water pump, and one big ass nut that threads into the water pump shaft. Everything else will come loose easily except the big nut. Of course, the one thing I need to come loose. Lol. I guess I'll get out a BFH and give it another good whack or 10 and see what happens.
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Old 03-03-2011, 02:11 PM   #29
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Don't forget it unthreads from the same direction it spins. So if it spins to the right, it unthreads that way as well. If it spins to the left it unthreads to the left.
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Old 03-03-2011, 06:49 PM   #30
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Yeah, I'm just sticking with the mechanical fan. After three days of trying bigger bars, bigger hammers, a torch to heat it up, WD40 hoping that a little would get in the threads ... F it .. Mechanical is it now until that water pump goes out. And with only 29,000 miles on the odometer, I will be waiting a while I'm sure. Thanks for the help everyone! Happy Jeeping! On a positive note.. I did get to take the top off and cruise around for the first time today. We hit 65 degrees and I said "close enough!"

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