Fan Clutch Testing?
Elder User
Joined: Jan 2002
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Fan Clutch Testing?
Hi MT,
The first thing to do is look at it! Check to make sure that all the blades are intact and not cracked. Then look for any oil leakage in and around it. When engine is cold try to spin the fan. It should have a fair bit of resistance but not too much. Check it again when the engine is really hot. It then should spin fairly easily. And last grab a couple of opposite blades and move the fan from side to side, there should be no play in it at all. good luck.
The first thing to do is look at it! Check to make sure that all the blades are intact and not cracked. Then look for any oil leakage in and around it. When engine is cold try to spin the fan. It should have a fair bit of resistance but not too much. Check it again when the engine is really hot. It then should spin fairly easily. And last grab a couple of opposite blades and move the fan from side to side, there should be no play in it at all. good luck.
New User
Joined: Jan 2008
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Fan Clutch Testing?
Are you sure that isn't the other way around?
If the fan spun easily it wouldn't have as much air drawing ability, as it would if it grabbed tighter(harder to spin) and spin the fan more visiously.
[font color=red]Dennis
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If the fan spun easily it wouldn't have as much air drawing ability, as it would if it grabbed tighter(harder to spin) and spin the fan more visiously.
[font color=red]Dennis
FTE Adminstration
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[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
64 1/2 Mustang Pre-World's Fair Car #8092
68-Mustang 289 2v-Sunlit Gold
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Elder User
Joined: Jan 2002
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Fan Clutch Testing?
If I'm not mistaken and I have been before, the clutch fan will actually shut down when on the freeway due to it not really being needed thanks to the wind from the highway. When the engine is cold the fluid inside the clutch is thick and will cause the fan to spin slowly or with some resistance. After a short trip you can notice that the fan will spin much easier due to the fluid being warmed up. It is my understanding that at idle the clutch will create the blades to spin faster than at a higher rpm.
New User
Joined: Jan 2008
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Fan Clutch Testing?
Okay, This part of the explanation is correct.
The other post made mention of WHEN the engine was cold it turn with some resistance > TRUE <
This part isn't.
But when the engine is HOT it should then turn FAIRLY EASY > WRONG <
When it's HOT :
It should be even Harder to turn because the fan clutch is attached to the fan pulley with the heated up fluid causing the clutch part GRABBING the clutch fan mounting flange and having tons of resistance.
That's all.
That's why people replace them when they've leaked and gone bad.
The are then ON all the time and un-neccessarily robbing the engine of horsepower.
Normally when you shut off a cool engine, the fan will keep on turning for a few seconds as opposed to a HOT engine the it will stop turning right away.
[font color=red]Dennis
FTE Adminstration
[/font]
http://www.clubfte.com/users/mil1ion/canada_flag_animated.gif
[link:www.clubfte.com/users/mil1ion/Mil1ion.html|My Website,"North Of The 49th"]
[link:www.ford-trucks.com/guidelines.html|Club FTE]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
64 1/2 Mustang Pre-World's Fair Car #8092
68-Mustang 289 2v-Sunlit Gold
[/font]
The other post made mention of WHEN the engine was cold it turn with some resistance > TRUE <
This part isn't.
But when the engine is HOT it should then turn FAIRLY EASY > WRONG <
When it's HOT :
It should be even Harder to turn because the fan clutch is attached to the fan pulley with the heated up fluid causing the clutch part GRABBING the clutch fan mounting flange and having tons of resistance.
That's all.
That's why people replace them when they've leaked and gone bad.
The are then ON all the time and un-neccessarily robbing the engine of horsepower.
Normally when you shut off a cool engine, the fan will keep on turning for a few seconds as opposed to a HOT engine the it will stop turning right away.
[font color=red]Dennis
FTE Adminstration
[/font]
http://www.clubfte.com/users/mil1ion/canada_flag_animated.gif
[link:www.clubfte.com/users/mil1ion/Mil1ion.html|My Website,"North Of The 49th"]
[link:www.ford-trucks.com/guidelines.html|Club FTE]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
64 1/2 Mustang Pre-World's Fair Car #8092
68-Mustang 289 2v-Sunlit Gold
[/font]
Thread Starter
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Mountain Pass
Joined: Jan 2002
Posts: 198
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From: Ft. Pierce Fl usa
Fan Clutch Testing?
Thanks guys. My fan has no change either hot or cold SO change it shall be for the fan clutch. It's lifetime warranty anyway. They should not do that for people like me who keep good records and never get a new vehicle, just another one. i've got about 14 of them back there. Oh well good for me bad for them.
THANKS AGAIN!
THANKS AGAIN!
