Clutch fan not spinning correctly
02-13-06, 04:00 PM
#1
Full Member
Thread Starter
Join Date: Jun 2005
Location: Lafayette, La
Posts: 210
Likes: 0
Received 0 Likes
on
0 Posts
Clutch fan not spinning correctly
I noticed my radiator over flowing with heat today
well i chequed everythign and it was ok while the car was running and i bumped into the clutch fan and it stopped spinining
i was like that should have at least hurt
whats going on
i looked deeper to realize that the clutch fan spins seperately from the eccentric shaft as if it isnt connected
i know it should spin faster
anyone have an idea as to how i should connect the two
i pulled on the fan
they seem connected but im probably doing something wrong
well i chequed everythign and it was ok while the car was running and i bumped into the clutch fan and it stopped spinining
i was like that should have at least hurt
whats going on
i looked deeper to realize that the clutch fan spins seperately from the eccentric shaft as if it isnt connected
i know it should spin faster
anyone have an idea as to how i should connect the two
i pulled on the fan
they seem connected but im probably doing something wrong
02-13-06, 04:43 PM
#2
Back from the dead
Join Date: Dec 2002
Location: Laurel, MD
Posts: 242
Likes: 0
Received 0 Likes
on
0 Posts
The clutch has gone bad. If you touched it while it was running, you would lose your finger. Im not sure if you can repair it, I've only heard of getting a replacement clutch.
02-14-06, 07:14 AM
#6
Seduced by the DARK SIDE
Join Date: Apr 2001
Location: Orange Park FL (near Jax)
Posts: 7,323
Likes: 0
Received 2 Likes
on
2 Posts
A few years ago I had a bad fan clutch, so I did some exploratory surgery on it:
The fan clutch uses a silicon oil viscous fluid in two chambers inside.
A Bi-metal strip on the front bends outward as it warms and opens the valve from the reservoir side to the clutch side.
Centripetal force provides the pumping action to move the fluid.
When it sits for a few hours, it will spin the fan briefly on startup, then freewheel.
After 100,000 miles the bearing seals inside wear, and the bearing lube starts to weaken the clutch fluid's grip.
Both the S4 & S5 clutch freewheel when cold.
The s4 clutch increases it's bite gradually with temperature rise.
The s5 clutch is more on-off. (It just coasts until is gets warm)
Once they are warm, the fan speed goes up with engine speed to about 4000 RPM.
As the engine revs higher the fan stays at ~4K.
If your warmed up fan only revs up to < 2500 RPM, it's worn out.
The fan clutch uses a silicon oil viscous fluid in two chambers inside.
A Bi-metal strip on the front bends outward as it warms and opens the valve from the reservoir side to the clutch side.
Centripetal force provides the pumping action to move the fluid.
When it sits for a few hours, it will spin the fan briefly on startup, then freewheel.
After 100,000 miles the bearing seals inside wear, and the bearing lube starts to weaken the clutch fluid's grip.
Both the S4 & S5 clutch freewheel when cold.
The s4 clutch increases it's bite gradually with temperature rise.
The s5 clutch is more on-off. (It just coasts until is gets warm)
Once they are warm, the fan speed goes up with engine speed to about 4000 RPM.
As the engine revs higher the fan stays at ~4K.
If your warmed up fan only revs up to < 2500 RPM, it's worn out.
The following users liked this post:
rotaryB-2000 (09-16-19)
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
