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 Post subject: New Fan Clutch, is it working?
PostPosted: Wed Feb 28, 2018 7:51 pm 
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So I had noticed that the cabin temp gauge would shoot up to the 3/4 mark when I was "going home" (10 mile drive up the mtns, 3000' elevation rise). I figured it was the fan clutch, and I tried spinning the fan at the top of my trip and it was about the same resistance to turning as when cold. OK figured it was new fan clutch time. So I just put in a Hayden 2905.

At first I was a bit concerned, because the new 2905 spun much freer than the old clutch when cold. But took it for a ride up and down the "hill" and it seems to work, temps coming up the hill rise to just below the 1/2 way mark and stay there where they are supposed to be (although it was 40F outside so not a real hard test).

The thing that puzzles me, is again at the top of the trip, with the engine still 1/4 way hot, I stopped the engine and tried spinning the fan by hand. Spins freely just like it did when cold??? I thought with the clutch and engine relatively hot there'd be more resistance.

So how should one test a fan clutch? Can you expect to feel the resistance on a stopped engine hot or cold? Or do they require some RPM before they do their clutch thing?

Anyway, perhaps I am overthinking this, the new 2905 does seem to fix the overheating at least at cool temps. But I'd sure like to know if I got a working fan clutch or not and how to tell.

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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Wed Feb 28, 2018 8:29 pm 
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Location: Oregon Coast Dairy Country. Land of stumps, dumps, and "Liquid Pumps"
A thermal fan clutch works more like a torque converter than a manual clutch. They never lock up 100% solid, but increase the resistance to relative motion.

Electrical fan clutches use ECM - PWM to vary the viscosity of the fluid in the clutch, but other than that are pretty much the same.

http://www.haydenauto.com/upload/HaydenAuto/Documents/Cat_Hayden/Hayden%20Fan%20Clutch%20Design%20Types.pdf

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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Thu Mar 01, 2018 1:05 pm 
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Steve777 wrote:
The thing that puzzles me, is again at the top of the trip, with the engine still 1/4 way hot, I stopped the engine and tried spinning the fan by hand. Spins freely just like it did when cold??? I thought with the clutch and engine relatively hot there'd be more resistance.
I would wait until the engine is good and hot before trying that. The fan clutch doesn't have any way of knowing where your temperature gauge is pointing, it only reacts to the temperature of the air coming out of the radiator. With your coolant gauge at the 1/4 mark, your thermostat is most likely still closed and therefore hot coolant isn't circulating through the radiator yet.


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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Thu Mar 01, 2018 1:44 pm 
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The mech fans for our jeeps come on pretty late, something like 205 or more. By the time you stop and open the hood, even during hot summer weather, I don't think you'll have any luck feel more resistance. The only testing I've seen was in an oven. Those Hayden fans are also famous for being bad out of the box. Read online, and it's easy to find where they are junk new on multiple different applications. No clue why, but I only had to overheat once with a newer Hayden and I went electric. WWdiesel found one made by GM I think. I bet it's a better option, as the Hayden's have a terrible track record.

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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Thu Mar 01, 2018 7:16 pm 
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Location: Oregon Coast Dairy Country. Land of stumps, dumps, and "Liquid Pumps"
Hayden 2986
GM 15017911

Better than original
No problems with either.

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'06 Lbrty Sprt CRD 150K

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Weeks Stg1&2 EGRfix
PV-200
BLING
vent gauges

IDParts
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cams
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eTn1 GX2123 5v GPs

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GM 12611872
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2010 Ram Hemi Trans
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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Thu Mar 01, 2018 8:05 pm 
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My experience with the Hayden was that it never worked from the second I installed it. Best way to be sure it locks is to put it in the oven.

I just wouldn't really trust it as a number of folks around here had theirs fail right away or quickly after installing

Also, I thought the Hayden was designed to lock at a lower temp than the stock fan?

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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Thu Mar 01, 2018 9:11 pm 
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Location: Oregon Coast Dairy Country. Land of stumps, dumps, and "Liquid Pumps"
fan clutches dont lock at any temp

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'06 Lbrty Sprt CRD 150K

Sasquatch
DSS Turbo
CAT-elimntr
Weeks Stg1&2 EGRfix
PV-200
BLING
vent gauges

IDParts
head
cams
rockers
Timing set
ARP studs
eTn1 GX2123 5v GPs

YETI Custom Tune
Flowmaster 8325508
Carter P76611M
GM 12611872
Hayden 2986
GM 15976889
PATC Custom Billet
2010 Ram Hemi Trans
Sonnax 44957
Transgo kit
Cooper 51770


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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Fri Mar 02, 2018 1:41 pm 
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I bought Hayden last fall. My check is it does the noisey fan howl first thing in the morning for a couple of seconds when cold. Then warms up and is quiet.

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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Fri Mar 02, 2018 2:25 pm 
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GordnadoCRD wrote:
Hayden 2986
GM 15017911

Better than original
No problems with either.

Please Note:
If going to the HD V8 GM fan clutch set up on your Jeep CRD, you must use the *GM 11 blade fan listed below. (OEM Jeep fan blades will not bolt up to the GM fan clutch)

NAPA part no.s (fitment: Chevrolet V8 Truck w/HD cooling system)
GM Severe Duty Fan Clutch NAPA 271625
Hayden Fan Clutch PN for GM: HY 2986
Four Seasons Fan Clutch for GM: FS46023 (almost identical to GM OEM fan clutch)
*GM 11 blade HD Cooling Fan NAPA PN - 8552223 or GM PN - 15976889

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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Fri Mar 02, 2018 5:09 pm 
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GordnadoCRD wrote:
fan clutches dont lock at any temp
Well no but close. What word should we use instead?

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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Fri Mar 02, 2018 9:48 pm 
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mass-hole wrote:
GordnadoCRD wrote:
fan clutches dont lock at any temp
Well no but close. What word should we use instead?
Sent from my Pixel using Tapatalk

Gordon is correct, they never FULLY lock up 100% :roll:
Notice the percentages and those numbers are for a fully functioning new fan clutch; they degrade from there with time and miles... :(

Image

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Blk Brush Guard/Hella's/LED's
Ironman Springs/Bilstein's
Yeti Stg4 MaxTune
Weeks ElbowKit/BatteryTray
NO FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pump
2mic.Sec.Fuel Filter
Flowmaster/NOcat
V6 Airbox
GM11 blade fan/NAPA HDclutch
Ironrock Trilink
98 Dodge Cummins, 5"exh. Viair, Huge K&N


Last edited by WWDiesel on Wed Apr 25, 2018 2:21 pm, edited 2 times in total.

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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Sat Mar 03, 2018 2:25 am 
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When I had a BMW E30 the method to test the viscous fan clutch was to take a rolled up newspaper and push it into the turning fan when engine was hot.....if the fan ground to a halt then the clutch was faulty.....if you suddenly had an engine bay full of shredded newspaper then you knew the clutch was OK :lol:

I must try this test on my 2002 Export CRD....do not have any overheating problems but she is getting a bit old now and the fan clutch is the original as fitted at the factory.


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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Sat Mar 03, 2018 8:04 pm 
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mass-hole wrote:
GordnadoCRD wrote:
fan clutches dont lock at any temp
Well no but close. What word should we use instead?

Sent from my Pixel using Tapatalk

I suppose something like engage or activate would be a better term, however the point is, heating them in an oven and testing for lockup isn't going to work.

With a fluid coupling, they need to be turning to test them, as they are activated by fluid pathing, similar to a torque converter, only the bimetal spring operates what would function as the stator in a TC. When the fluid is allowed to circulate, resistance is high, causing to fan to draw air. Once it cools enough, the viscous fluid is blocked, releasing the resistance, so the fan free-wheels.

I suppose a better way to test it would be to make a way to couple the drive to a drill motor, then measure resistance force of the clutch when you use a heat gun or I suppose a propane torch held at a distance to produce the heat on the bi-metal spring.

_________________
'06 Lbrty Sprt CRD 150K

Sasquatch
DSS Turbo
CAT-elimntr
Weeks Stg1&2 EGRfix
PV-200
BLING
vent gauges

IDParts
head
cams
rockers
Timing set
ARP studs
eTn1 GX2123 5v GPs

YETI Custom Tune
Flowmaster 8325508
Carter P76611M
GM 12611872
Hayden 2986
GM 15976889
PATC Custom Billet
2010 Ram Hemi Trans
Sonnax 44957
Transgo kit
Cooper 51770


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 Post subject: Re: New Fan Clutch, is it working?
PostPosted: Mon Mar 05, 2018 9:32 pm 
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Thanks.

So it sounds like spinning the fan with my fingers, hot or cold, isn't going to show much. That makes sense.

I am guessing for now, since this new clutch does keep the temp gauge from going too high when climbing the mtn home, that it is working.

One other point I noticed, the old clutch never released as completely as this new one. Even by hand there was some resistance when dead cold. And with the new clutch the engine also seems to warm up a bit faster than before. I suspect the old one was stuck at some middle setting always partially engaged but never fully. Kept things cooler when it shouldn't have when cold and did not work the fan enough when it needed to on hot. Just a data point for others considering this repair.

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