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#4553223 - 10/24/17 03:46 PM Testing a fan clutch?
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: Houston, Texas
The shop thinks I need a new fan clutch because it wasn't speeding up and slowing down. It was 55 degrees outside that morning and I said it's probably not going to since it's not hot outside. I read on the internet that you can spin it by hand and if it stops almost immediately it was okay. Then I have another guy saying its bad because it continues to speed for like 5 seconds after I shut the engine down. Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Edited by motor_oil_madman (10/24/17 03:48 PM)
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4553233 - 10/24/17 03:52 PM Re: Testing a fan clutch? [Re: motor_oil_madman]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4216
Loc: Storrs, Connecticut
You have to test it at operating temp. Get the engine to operating temp, shut it off, try spinning the clutch by hand and it should have a bit of resistance.
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#4553236 - 10/24/17 03:54 PM Re: Testing a fan clutch? [Re: motor_oil_madman]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
On your Cummins? They're tough to gauge. Due to them being electronic, they do what they want when they want. Idling a diesel looking for the fan clutch to turn on is even tougher because they're not big heat shedders when not under load.

However, they can definitely under perform without giving any noticeable signs. I had no codes, no overheating, and no other noticeable symptoms other than occasionally crawling to 208, and failing to engage when my AC pressures got too high. Did perfect otherwise. Bad fan clutch.

When not engaged by the computer, it's going to act completely loosey goosey.
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#4553361 - 10/24/17 05:52 PM Re: Testing a fan clutch? [Re: motor_oil_madman]
camrydriver111 Offline


Registered: 07/01/14
Posts: 1488
Loc: Canada
Quote:
Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Your clutch fan is probably fine then.

I think listening to it while driving is the best way to test it.

Spinning the fan by hand doesn't tell you much.
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#4553362 - 10/24/17 05:52 PM Re: Testing a fan clutch? [Re: motor_oil_madman]
JMJNet Offline


Registered: 09/06/07
Posts: 934
Loc: TX, USA
May want to check with the Cummins forum/crowd?
This is more of a generic forum, not that there are not any Cummins experts/owners here but who knows.
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#4553404 - 10/24/17 06:36 PM Re: Testing a fan clutch? [Re: motor_oil_madman]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
Those electric fan clutches on those Dodge trucks are junk! We replace them on almost every 07+ Dodge truck with a 6.7 we get in the shop. They have a huge failure rate.
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#4553530 - 10/24/17 08:25 PM Re: Testing a fan clutch? [Re: camrydriver111]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: Houston, Texas
Originally Posted By: camrydriver111
Quote:
Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Your clutch fan is probably fine then.

I think listening to it while driving is the best way to test it.

Spinning the fan by hand doesn't tell you much.


Of course I checked it today and it was just idling, not speeding up and slowing down. Outside temp was 75
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2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4553619 - 10/24/17 09:37 PM Re: Testing a fan clutch? [Re: motor_oil_madman]
JHZR2 Offline



Registered: 12/14/02
Posts: 41779
Loc: New Jersey
Isn't there some trick to test with a roll of newspaper?

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#4553672 - 10/24/17 10:24 PM Re: Testing a fan clutch? [Re: jeepman3071]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: Houston, Texas
Originally Posted By: jeepman3071
You have to test it at operating temp. Get the engine to operating temp, shut it off, try spinning the clutch by hand and it should have a bit of resistance.


It has resistance moving it by hand. If you shut the engine off it continues to spin, not sure if that means it shot also.
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#4553674 - 10/24/17 10:27 PM Re: Testing a fan clutch? [Re: motor_oil_madman]
mk378 Offline


Registered: 09/27/15
Posts: 1418
Loc: USA
The electric type will disengage when you turn the key off, because, well, it's electric.

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#4554048 - 10/25/17 10:51 AM Re: Testing a fan clutch? [Re: JHZR2]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
Originally Posted By: JHZR2
Isn't there some trick to test with a roll of newspaper?
not his electric one.
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#4554662 - 10/25/17 10:25 PM Re: Testing a fan clutch? [Re: camrydriver111]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: Houston, Texas
Originally Posted By: camrydriver111
Quote:
Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Your clutch fan is probably fine then.

I think listening to it while driving is the best way to test it.

Spinning the fan by hand doesn't tell you much.



The guy at the shop thought it was bad because the ac pressure went to 400psi and he said the fan should have spun up because of that. Last I checked the fan really doesn't do much this time of year when it's only 65-75 degrees outside, usually I only hear the fan during during summer months. I've had this truck for 10 years now, so I would know. Just three weeks ago I remember it blowing the dirt off the ground when I was backing up 75 feet at 10mph with the trailer behind me. lol
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2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4554706 - 10/25/17 11:24 PM Re: Testing a fan clutch? [Re: Chris142]
Colt45ws Offline


Registered: 08/15/06
Posts: 9640
Loc: Central Washington
Originally Posted By: Chris142
Originally Posted By: JHZR2
Isn't there some trick to test with a roll of newspaper?
not his electric one.

If you had a way of interrogating the computer and seeing when it called for it to be locked and then test and see that its actually locked? Would that work?
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#4554775 - 10/26/17 01:55 AM Re: Testing a fan clutch? [Re: motor_oil_madman]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Originally Posted By: motor_oil_madman
Originally Posted By: camrydriver111
Quote:
Later that day when it was warmer outside and it was increasing and decreasing in speed like it always has.


Your clutch fan is probably fine then.

I think listening to it while driving is the best way to test it.

Spinning the fan by hand doesn't tell you much.



The guy at the shop thought it was bad because the ac pressure went to 400psi and he said the fan should have spun up because of that. Last I checked the fan really doesn't do much this time of year when it's only 65-75 degrees outside, usually I only hear the fan during during summer months. I've had this truck for 10 years now, so I would know. Just three weeks ago I remember it blowing the dirt off the ground when I was backing up 75 feet at 10mph with the trailer behind me. lol


Oh yeah. Typical. You better do something about that, or you'll start shooting AC system seals and hoses soon.
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#4555621 - 10/26/17 08:56 PM Re: Testing a fan clutch? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: Houston, Texas
Typical of a fan clutch? Or something else?
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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