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Fan Clutch #737356
June 17th 2018 10:46 am
June 17th 2018 10:46 am
Joined: Jun 2010
Posts: 1,002
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nikothenomad Offline OP
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nikothenomad  Offline OP
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Have any of you had your original fan clutch out of your Dodge and identified the branding? Up until removing our fan clutch, everything we have taken off was clearly marked Mopar.

This clutch I just removed has Eaton etched into it (not stamped as I have seen on other Eatons online). The fan blades themselves are marked Mopar. Anything I find on Eaton (although I haven't been able to find my exact one) appears to be from the 60's for Chevy's.

I'm trying to determine of this part was original as all of my others have been.

Thanks.


Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Fan Clutch [Re: nikothenomad] #737357
June 17th 2018 12:48 pm
June 17th 2018 12:48 pm
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
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Fircrest, WA
Original fan clutches were Chrysler parts. They had the pentastar and a part number stamped on them. It might be an aftermarket replacement.


Windows- they're what make a van worth owning!
Re: Fan Clutch [Re: nikothenomad] #737358
June 17th 2018 3:54 pm
June 17th 2018 3:54 pm
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nikothenomad Offline OP
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nikothenomad  Offline OP
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Reed that is what I am thinking. Funny they replaced it with one from the 60's - 70's.

Question: when you say "stamped" do you mean "printed" or etched into the surface?

Well, we freed up the spring from its years of grime that had it fully locked (and protected from rust I might add) and will see if we get any different performance.

We are baffled at how these are supposed to work. The more we read the more confused we get about this simple concept.


Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Fan Clutch [Re: nikothenomad] #737359
June 17th 2018 3:55 pm
June 17th 2018 3:55 pm
Joined: Jun 2010
Posts: 1,002
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nikothenomad Offline OP
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nikothenomad  Offline OP
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Reed that is what I am thinking. Funny they replaced it with one from the 60's - 70's.

Question: when you say "stamped" do you mean "printed" or etched into the surface?

Well, we freed up the spring from its years of grime that had it fully locked (and protected from rust I might add) and will see if we get any different performance.

We are baffled at how these are supposed to work. The more we read the more confused we get about this simple concept.


Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Fan Clutch [Re: nikothenomad] #737361
June 17th 2018 4:22 pm
June 17th 2018 4:22 pm
Joined: Jun 2010
Posts: 1,002
USA
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nikothenomad Offline OP
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I'm thinking now that it is indeed the original. I've found a few now that show the Mopar 'stamped' / painted on and the Eaton etched into them like ours is. I guess the paint on ours has just worn away.

https://bluestarperformance.com/catalog/product/gallery/id/2056/image/7290/


Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Fan Clutch [Re: nikothenomad] #737362
June 17th 2018 4:22 pm
June 17th 2018 4:22 pm
Joined: Jun 2010
Posts: 1,002
USA
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nikothenomad Offline OP
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nikothenomad  Offline OP
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I'm thinking now that it is indeed the original. I've found a few now that show the Mopar 'stamped' / painted on and the Eaton etched into them like ours is. I guess the paint on ours has just worn away.

https://bluestarperformance.com/catalog/product/gallery/id/2056/image/7290/


Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Fan Clutch [Re: nikothenomad] #737363
June 17th 2018 5:13 pm
June 17th 2018 5:13 pm
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
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Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Clutch fans operate in one of two ways. There are thermostatically controlled clutches and centrifugally cnotrolled clutches. Each operates as its name implies. Thermostatic clutches disengage when the ambient temp around the clutch is cooler but engage when the ambient temp increases. Centrifugally controlled clutches engage at low RPM but disengage at higher RPM. The idea to to not drive the fan either when the engine is cold or when the RPM is high and the airflow across the radiator is enough to cool the motor.

Mopar has used both types depending on the application.Rockauto lists both thermal and non-thermal clutches for your application. Personally, I would run a thermally controlled clutch. That way it ill engage even if you are sitting parked with a high idle (for whatever reason).


Windows- they're what make a van worth owning!
Re: Fan Clutch [Re: nikothenomad] #737364
June 17th 2018 11:02 pm
June 17th 2018 11:02 pm
Joined: Jun 2010
Posts: 1,002
USA
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nikothenomad Offline OP
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Thanks reed. Yes the one we took off to clean was thermal had a spring that turns a little valve. After I cleaned it all up we tested it several times with a hair drier. The spring does contract and turn the valve. Seems to start doing so early at 120 degrees and doesn't compete it's full range. Either way we put it back in tonight and since we don't have a photo tech we'll do other tests we've read about.


Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Fan Clutch [Re: nikothenomad] #737365
June 17th 2018 11:49 pm
June 17th 2018 11:49 pm
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Hmmm. The clutch fluid can leak out over time. I wonder if that is making the clutch engage prematurely and remain engaged too long? Weren't you having problems with the engine running too cool?


Windows- they're what make a van worth owning!
Re: Fan Clutch [Re: nikothenomad] #737366
June 18th 2018 8:43 am
June 18th 2018 8:43 am
Joined: Jun 2010
Posts: 1,002
USA
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nikothenomad Offline OP
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nikothenomad  Offline OP
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Yes, as I look back at the history of us having the van we notice she has always run cool. I also noticed that around 2011 I inquired about our fan appearing to run full speed all of the time.

I will be interested this afternoon to see how the fan does under testing now that I cleaned it up. As locked in with dirt as it was I cannot imagine there was any movement at all of the spring or the valve.

I'm pretty sure the fluid is still in there and in good shape. I get the kind of resistance you would expect from a corn syrup consistency upon rotation by hand, no locking up and no freewheeling. Seems just right to me. I'm just not sure that the spring is turning the valve enough. I see it move upon heat from the hair drier but not necessarily the amount I would have thought it would. Then again, there are no data out there about how far the valve needle should be observed turning so maybe cleaning it was all that was needed.

We'll do a few tests today and then try the RPM tests when we can obtain a photo tach that is worth anything. The one we picked up at HF didn't work worth a flip. I will be curious to get some actual numbers if we can.





Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
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