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replacing fan clutch/coupling - How to's
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Cliff_Jumper



Joined: 03 Dec 2008
Posts: 41
Location: Maryland

PostPosted: Sun Feb 13, 2011 5:26 am    Post subject: replacing fan clutch/coupling - How to's Reply with quote

Just replaced the fan clutch over the weekend and it is not that hard to do.

Here's a step-by-step how to so you can do-it yourself.

First, take off the metal cover underneath the engine. Take the intake tube, filter box and engine cover.
Second, take the lower shroud.

Third, unscrew the upper shroud from the radiator and move it as far back as possible.
Fourth, unscrew the electric fan from the radiator and unhook the wire on the left side of the upper shroud. Lift the fan from the radiator mount and carefully slide the fan to the right where there is more room. Then lift the fan off from the shroud.


Next, you lift the upper shroud off the engine bay. There you go, all the space needed to do the work.


Next, you unbolt four bolts attaching the fan from the coupling.


unbolt the four 10mm nuts holding the coupling/clutch from the pulley.


here's the comparison of the old and the new.


to re-install, just do it in reverse.


:cheers:
_________________
2005 Storm Gray Pathfinder SE
"Completely Stock" with 70K miles
Replaced so far:
2 tensioner and 2 belts
1 fuel sending unit
Radiator
clutch fan
rusted brake rotors and pads
U-Joints (front drive shaft)


Last edited by Cliff_Jumper on Wed Feb 16, 2011 6:26 pm; edited 1 time in total
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scrooks



Joined: 12 Feb 2011
Posts: 20
Location: San Clemente

PostPosted: Fri Feb 18, 2011 10:22 am    Post subject: Reply with quote

Wow, Great write up and pics. What was the indication that the clutch was not working properly in your case?
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Cliff_Jumper



Joined: 03 Dec 2008
Posts: 41
Location: Maryland

PostPosted: Sat Feb 19, 2011 11:14 am    Post subject: Reply with quote

The dealer said so and it was loud at start up. With this write-up, you can do a radiator replacement.
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2005 Storm Gray Pathfinder SE
"Completely Stock" with 70K miles
Replaced so far:
2 tensioner and 2 belts
1 fuel sending unit
Radiator
clutch fan
rusted brake rotors and pads
U-Joints (front drive shaft)
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disallow
Site Admin


Joined: 13 Aug 2008
Posts: 1934
Location: Winnipeg, Canada

PostPosted: Sat Feb 19, 2011 7:09 pm    Post subject: Reply with quote

Cliff_Jumper wrote:
The dealer said so and it was loud at start up. With this write-up, you can do a radiator replacement.


great writeup man.
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 250000kms - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, By-passed water/oil transmission cooler, Prostart Remote Starter, Bilstein 5100 rear shocks, BFG T/A KO 265/75/16
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goblue90



Joined: 02 May 2007
Posts: 309
Location: Northern Virginia

PostPosted: Sun Feb 20, 2011 5:39 pm    Post subject: Re: replacing fan clutch/coupling - How to's Reply with quote

Cliff_Jumper wrote:
Just replaced the fan clutch over the weekend and it is not that hard to do.

Here's a step-by-step how to so you can do-it yourself.
:cheers:


Wow, great write-up! Thanks Cliff Jumper!
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'05 LE: 18" G-FX OR7, 275/65/18 GY Duratracs, 2" lift w/Radflo 2.0 coilovers, HD Bilstein shocks, Rancho Spacers, AirLift1000; AP Racing brakes & Goodridge stainless steel brake lines; Bully Dog Triple Dog GT; WRP IMS, Magnaflow 12580; Pioneer AVIC-D3, Shrockworks winch bumper & sliders, Skidrow skidplates, Engo E12000 winch; custom roof rack; HID retrofit; 30" LED light bar, Rigid Dually reverse lights, front camera.
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gkb62001



Joined: 11 Nov 2010
Posts: 68

PostPosted: Wed Feb 23, 2011 1:09 pm    Post subject: Reply with quote

I guess it's still a little ambiguous to me how you detect if it's faulty. I'll check for fluid and to see if it feels loose, as well as trying to judge whether it spins too much or too little... My Pathy is very loud (sounds like the fan is very loud) sometimes, usually at startup or lower speeds and was particularly the case while I was in the mountains over the weekend. Now I'm worried that this may be an issue rather than just a normal function of the vehicle.
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disallow
Site Admin


Joined: 13 Aug 2008
Posts: 1934
Location: Winnipeg, Canada

PostPosted: Wed Feb 23, 2011 1:53 pm    Post subject: Reply with quote

gkb62001 wrote:
I guess it's still a little ambiguous to me how you detect if it's faulty. I'll check for fluid and to see if it feels loose, as well as trying to judge whether it spins too much or too little... My Pathy is very loud (sounds like the fan is very loud) sometimes, usually at startup or lower speeds and was particularly the case while I was in the mountains over the weekend. Now I'm worried that this may be an issue rather than just a normal function of the vehicle.


I don't know what the spec on the Pathy fan clutch is. However, on the fan clutches that I buy for our coaches, they are called '2-speed'. The 2 speeds are 'slip' and 'direct'. Slip mode means the clutch is not locked, but the fan will still spin because there are magnets in the hub and the flange of the clutch that cause the fan to spin even though the clutch is not locked.

Once the Engine coolant Temp reaches the threshold (determined by the ECM), the clutch would lock and run in 'direct' mode.

If the Pathy clutch operates in a similar manner, a way to test the clutch could be to see if the fan can be stopped when you know the threshold for clutch lock has not been met. Could be dangerous. There must be a test to see whether the clutch actuator is working or not.


***EDIT***

After further research, I have found that the pathy fan clutch is a viscous fan clutch. There is a silicone fluid that changes properties as the ambient temperature increases, causing the clutch to engage. As viscous clutches age, this fluid becomes 'stiff' and causes the clutch to engage at lower temperatures. Eventually, it just stays on all the time, like on my truck.

Hope that clarifies. I wish it was an electromagnetic clutch like we use on the coaches that my company makes. Much more reliable and efficient.
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 250000kms - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, By-passed water/oil transmission cooler, Prostart Remote Starter, Bilstein 5100 rear shocks, BFG T/A KO 265/75/16


Last edited by disallow on Wed Jun 05, 2013 4:45 am; edited 1 time in total
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valenburg



Joined: 11 Nov 2009
Posts: 79
Location: Maine

PostPosted: Sat Jul 09, 2011 4:42 am    Post subject: Reply with quote

My Path sounds like damn super powered box fan when I start it up, even in the winter. When rolling around town it seems a bit loud but I figured it was kinda designed to not run hot...I guess I will have to check it out. Would something like this effect fuel economy?
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jpar



Joined: 02 Oct 2010
Posts: 6
Location: central nj

PostPosted: Sat Jul 09, 2011 12:18 pm    Post subject: Reply with quote

I tracked down a loud kind of rattling noise to this area, I thought it was the clutch too. I started the truck cold and jammed a srew driver into the fan blades to stop it from spinning, the noise continued. Then I used a long screwdriver as a stethoscope and can hear the same noise coming from the the fan pulley bracket behind the fan, I think the bearings going. Gonna order one up this week and see what happens.

Great write-up, I never think to take pics when I do stuff.

http://www.courtesyparts.com/21052m-bracket-fan-pulley-pathfinder-r51-2005-2010-40l-p-566015.html?cPath=6833_6834_6855_6858&
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twinblown



Joined: 13 Jul 2009
Posts: 137
Location: Central Florida

PostPosted: Tue Jul 19, 2011 8:52 am    Post subject: Reply with quote

Is it necessary to remove the botom plate and lower shroud? couldn't this be done by just removing the upper shroud? or does the upper shroud not come out unless the botom is removed. I guess I have not looked in the engine bay to determine this. Question
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gilldawg79



Joined: 11 Apr 2010
Posts: 25
Location: Alabama

PostPosted: Thu Jul 21, 2011 6:29 pm    Post subject: Reply with quote

Would this noise you are referring t kinda sound like a roaring noise that follows acceleration? As in, when you rev it up it gets louder?
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'05 XE 4X4
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Tow a 2008 Jayco 19BH, and a Kubota Tractor sometimes
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TheRealDoug



Joined: 21 Aug 2011
Posts: 16
Location: Chattanooga, TN

PostPosted: Wed Aug 24, 2011 5:59 pm    Post subject: Reply with quote

gilldawg79 wrote:
Would this noise you are referring t kinda sound like a roaring noise that follows acceleration? As in, when you rev it up it gets louder?


I have a similar noise. To me it sounds like a fan, but am worried it might be timing chain....

Are electric fans available for these vehicles?
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JAHBLESSINGS



Joined: 13 Oct 2008
Posts: 1377
Location: 90 DEGREES FLORIDA

PostPosted: Tue Sep 13, 2011 7:18 pm    Post subject: Reply with quote

Just recently changed my fan clutch also. I did mine with just removing the intake tube and loosing the two top shroud bolts. I then push the shroud enough to get my hands to reach the bolts. Took me about 20 minutes. Advice to pathy owners. beware of aftermarket clutch fans as I bought one and it was loud as hell I ended up returning it and got a oem one. The noise was unbearable.
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disallow
Site Admin


Joined: 13 Aug 2008
Posts: 1934
Location: Winnipeg, Canada

PostPosted: Thu Sep 15, 2011 6:30 am    Post subject: Reply with quote

JAHBLESSINGS wrote:
Just recently changed my fan clutch also. I did mine with just removing the intake tube and loosing the two top shroud bolts. I then push the shroud enough to get my hands to reach the bolts. Took me about 20 minutes. Advice to pathy owners. beware of aftermarket clutch fans as I bought one and it was loud as hell I ended up returning it and got a oem one. The noise was unbearable.


Noisy in what way? Did it create interference with your fan shroud? Or was it spinning faster than the OEM one?

t
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 250000kms - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, By-passed water/oil transmission cooler, Prostart Remote Starter, Bilstein 5100 rear shocks, BFG T/A KO 265/75/16
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FMoreno1



Joined: 22 Sep 2011
Posts: 1
Location: Texas

PostPosted: Thu Sep 22, 2011 7:37 am    Post subject: Avoid Non-Nissan Fan Clutches Reply with quote

Had a problem with my 2006 Pathfinder 4.0 L Fan Clutch. Initially installed a non-factory replacement clutch and had problems. Non-factory clutch shaft that was harder to turn and when installed the fan clutch was constantly engaged and loaded down the engine. This additional load caused the engine to rev higher especially when accelerating and also caused serpentine belt squealing and you had to press down on the accelerator more to get the vehicle moving.

Genuine Nissan clutch fixed the problem.
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