That explains why when I 1st start my car in the morning the fan runs for about 30 seconds & then disengages. Obviously the fluid has been trapped & has to flow back to the reservoir 1st.

@MrKnutriis

2 жыл бұрын

Yes - and the oil is very viscous when it is cold so it tends to drag the fan initially.

@orbitaljellyfish808

2 жыл бұрын

It all makes sense now lol

@jf4872

2 жыл бұрын

@@MrKnutriis Particularly more noticeable on a colder day vs warmer ambient temp day.

@cristinapugh831

10 ай бұрын

Fans not moving on car

Well I'll be damned. Always been curious about this and now I know. Thanks a bunch!!

One of the more amazing overlooked parts.

These is the best description of how the fan clutch works. Thanks for explain it.

I knew that it had its own fluid that self contained but I never understood the principles in which it acts. Very simple system. No wonder fan clutches last for years before needed to be changed. Still going to convert my Tahoe to electric fans but now I understand how the mechanical clutch works. Thank you for this. Very informative.

Perfectly explained. Thank you.

never had any trouble with type of clutch but really got into a crimp with a newer air operated one. Good explanation and Thanks!

Thank you. Clear and to the point. Nice job.

Many thanks for such a great demonstration ...

I had no idea how these worked. The best I could come up with was so kinda magic. Thanks!

That's a very comprehensive explanation, simply put yet well said.

This is absolutely an amazing explanation. All explained simply without unneeded details.

WOW, I learned something new today, THANK YOU !!!!

I've always wondered how the viscous fan clutch on my E39 worked, this video was quick and made it simple to understand, thanks!

@aminecatalyseur8281

3 жыл бұрын

I want to change this oil to make it strong did u try it i have 525 tds e39

@busterscrugs

3 жыл бұрын

@@aminecatalyseur8281 the fan clutch is sealed, no way to change the fluid inside. my original fan is still working good and it has 190k miles. a new one is cheap, it's best to buy a new one if yours goes bad

@aminecatalyseur8281

3 жыл бұрын

@@busterscrugs really thank u so much..

@jimmyboggess6534

2 жыл бұрын

e39 owner here also lol

@Ayixlia

Жыл бұрын

Your BMW can drive just fine without the fan as long your electric fan for the radiator works.

I used one Kit Masters Horton Fan clutch rebuild kits on my 3406e Cat from Southern Electric in Conley Georgia & that was a beautiful kit & saved me a nice chunk of change too🥰👍🏿 Shout out to Dale at J&J truck repair for telling to buy it there & then he installed it for me for a great price! All together buying the reman plus install still came in under the price of a new one that wasn't a Horton Clutch! I get all my starters & alternators from Southern Electric & that's not often because they rebuild them to last👍🏿

Thank you so much, this gave me all the info I could have hoped for!

Impressive engineering for a $25 part.

@GarySchiltz

2 жыл бұрын

What kind of car uses a viscous fan clutch that only costs $25? I'm looking at around $400 for one for my 2003 Nissan Patrol.

@thepeople4142

2 жыл бұрын

@@GarySchiltz factory Nissan parts are ridiculous. Last one I bought for my keep was $25 at O'Reilly. Lol

@justjoshin5140

2 жыл бұрын

@@GarySchiltz if your still looking to buy one check rockauto they usually have the cheapest prices. I buy all my parts from them

@seantbr2019

2 жыл бұрын

@@GarySchiltz thats ridiculous

@JimmyBreedlove

Жыл бұрын

@@GarySchiltz I just purchased and installed a brand new water pump and fan clutch assembly on my 1995 Nissan D21 for $48 brand new lol

Ah that's good !! I ready change my fun clutch 😊 now it's work great!

That was very well explained.

I often wondered how one worked. Thank you.

That was an amazing explanation

This technology is actually quite genius. I replace my electric fan because there were too many problems with one of these clutches and it has not failed me once so far

@stephanparis6085

2 жыл бұрын

I actually did the reverse as my fan clutch failed lol. Initially didn’t set out to remove the serpentine belt-driven fan but after replacing the water pump, radiator, hoses… and not bothering to put the mechanical fan back on, I noticed a 40+ miles increase when running without a fan. At first I thought this is impossible, a 10% increase in MPG just by removing a 15lbs fan?? I kept driving for almost a year without a fan and consistently got at least 40 more miles per tank which has a 400 mile range, sometimes as high as 45 additional miles. Now that it’s summer in TX and I can no longer drive without a fan without the motor running very hot borderline overheat, I ended up putting in a dual electric SPAL fan setup. I was a lot of work because you have to make custom mounting brackets and run wiring.. but it gets better gas mileage and is kinda cool to have an older truck with e-fans.

@victorbatiste9834

Жыл бұрын

Changed mind 3 time and each time freon is released NO A/C 😢

Extremely useful, thanks sir.

I wasn't expecting this complex👍😊

Mate, this is one of the best educational videos I have seen. Well done, animations were amazing!

Great Explanation!

How does the fluid flow "uphill" or against centrifugal force in the return lines?

@ddjohnson9717

2 жыл бұрын

Based on this video: kzread.info/dash/bejne/gJN7zdeNl63YY9o.html Looks like the bimetal plate links to a piece of sheet metal that acts like a piston to suck the fluid back in. OR what I was thinking - the drive side has a specific geometry that acts as a pump all the time. so that's two possible solutions.

@MrKnutriis

2 жыл бұрын

@@ddjohnson9717 The fins in the clutch act as a pump overcoming the centrifugal force - pumping the oil back. The bimetal thermostat is opening and closing the oil entering the clutch and gets pumped back from turning. If it gets warm enough it opens for the oil and engages the clutch and keeps it engaged until the valve is closed and the oil is pumped back into the reservoir.

@ddjohnson9717

2 жыл бұрын

@@MrKnutriis yeah so like what i though: drive side has a specific geometry that can pump oil back. The fan side will have drag, and when the valve is open oil stats flow back. Very hard balancing act it looks like. Thanks for clearing up!

@MrKnutriis

2 жыл бұрын

a small valve

@MrKnutriis

2 жыл бұрын

@@ddjohnson9717 Well, it's not that difficult

Learned allot . Thanks.

Great Video!

Great presentation!

These viscus clutches are the bomb

I love these intelligent mechanical designs

very good explanation!

very educative. Thank you

Hey!! Greetings from Colombia 🇨🇴 South America!! Nice video and l explanation !! Thanks

Nice! Having mostly worked on motorcycles and VWs I was wondering what that spring was for. I was told that the viscous fluid was temp sensitive, activating the drive by thickening to transfer the power (as viscous couplers work in some all wheel drive systems).

Excellent video. 👍

Thank god an actual video that exspains how they are supose to work I hope ford's have watched this Mr Ford man there not supose to spin when radiator is cold ie engine coolent temp passing through rad and when they roar when cold and spin when cold there goosed I wished all the deisel engineers and garages would have watch this it would have saved me 5 rads and stats and pumps

great info, I had no idear.

Perfectly explained

Fantastico video. Thanks

Excellent explanation, would have never guessed that's what the spring on the front was for. These things must turn off at a pretty low temperature because the one on my truck always runs, even on a "cold" day here, about 60*F.

@MrKnutriis

2 жыл бұрын

They always runs the fan some but gradually engages as they warm up.

@mann_idonotreadreplies

Жыл бұрын

there's always some rotation just not at full speed.

Most pneumatic fan clutches I’ve dealt with, air would be used to disengage the fan clutch, not engage it - engaged was the default position in the event of a fan clutch failure.

🎉 Thankx for sharing. I need one that I am sure of.😢

Well explained

Great, I have one on my Buick and they dont give them away. Thanks for the video I did learn something.

Thanks for the information. can it be adjusted? Recently replaced mine and it takes awhile to disengage after startup, and engaged again before the vehicle can reach operating temperature ,its now causing bad fuel economy and loss of power when in its engaged . Kia k2700 non turbo ,its already under powered ,lol

Also worth mentioning these things last forever. Ive rebuilt several engines in vehicles from the 70s 80s with over 150k miles. Have not once replaced the fan clutch

@erickrick3901

Жыл бұрын

*Sprinter owners look over suspiciously*

@donprather742

Жыл бұрын

Had one fail recently on my 2005 Ram 5.7. The problem presented as a high pitched whistle of all things, when the fan was supposed to engage. Took months to figure out after replacing the EGR, PCV, water pump, with no luck. Replaced the fan clutch with the water pump (and the radiator after nicking it.. oops) and voila! Noise gone and I can clearly hear the fan engage and disengage. It's actually a pleasure to hear the fan come on and off as it's a more aggressive pitch die to tow package. Also, the truck roars for a second when I start it as the fan spins before it disengages.

How does the fluid return to the center housing when the entirety is spinning?

What direction does the bimetallic spring in the center turn when its hot?

Do you also need to service the fan? Do you change the oil inside too?

I have a 2004 Chevrolet suburban my second time changing the fan clutch and my truck still still sound like a jet plane taking off all this loud air noise would like to know if it's the fan clutch no good

Best explanation I've ever heard 👍 If I could thank you a million times i would

What is Cadillac’s viscous converter clutch? What does it look like? I have a front wheel drive 1992 sedan de ville

Toyota fan clutch! Very well defined...

Yo i didnt know i needed to know this.

Just in process of change fan clutch on 2011 Dakota. Question does cold temp affect the clutch fluid? This morning the outside temp is -20C.

Interesting! I used to think it was just a plate being pushed closer to another plate and always filled with thick oil.

excellent

What temp would the clutch engage on a gm truck?

Very Good!..

Question how much silicone fuid do you need?

Good teacher

Do you need replace/add the fluid regularly?

So if you install a new clutch how long does it take to release the fan? With high temperatures not above freezing and not driving alot either

Brilliant

Can a visions fan clutch be partly engaged for example around 200F, then fully engage around 210F ???

The Humvee has a hydraulic activated fan. An extra hydraulic line comes from the power steering pump and goes to a solenoid. When the solenoid opens the hydraulic fluid pressure flows to the fan clutch and engages the clutch. It's really interesting and pretty simple.

@TheShamiester

5 жыл бұрын

Salty Steel some Toyota’s had that too. Hydraulic fans are cool tech.

@TheShamiester

2 жыл бұрын

@@georgevinson612 I can imagine. It’s a complex system.

@glennfrancis9031

2 жыл бұрын

@@TheShamiester Yeah, I think some early '90 Camrys with the V6 had them.

@TheShamiester

2 жыл бұрын

@@glennfrancis9031 I know the ones we got from Japan had them as well on the diesel version.

@Colt45hatchback

2 жыл бұрын

My 1989 toyota celsior had the power steering fluid driven fan too. It worked well, 46°c outside, both air conditioners on, temperature remained optimal

I just drill holes in the clutch, run a tap and then insert some bolts. When you live in the desert Southwest it seems okay to have the fan on all the time after it breaks anyway.

@MrKnutriis

2 жыл бұрын

Mine had gone bad and I just epoxied it in place until I could replace it.

@nairdacharles9492

2 жыл бұрын

I cut even pieces from the fan blades when i did that because the fan would run at a higher speed and take too much power. Still sounds loud. I might cut off of a bit more.

@MrKnutriis

2 жыл бұрын

@@nairdacharles9492 Yes, or even better; replace the clutch. It's a $25 - 5 minute job - or 25 minutes if you're really slow.

@mann_idonotreadreplies

Жыл бұрын

true until you use the highway.

Useful

if you shut down a engine and the fan spins for several rotations freely is the fan clutch bad?

Thanks a bunch...

That explains why my friend twisted that piece the spring is connected to.. the fan quit working so he twisted that part and now it’s always working lol.. i know he’s coming up my street because i can hear the fan going from 2 blocks away

🔵 I'm still not quite clear on how the fluid is "Pumped" back to the storage-chamber when the temperature drops below the 'On' set point.

@asvarien

2 жыл бұрын

The narrator tells us that as long as the valve is open there is a continuous circular flow from the reservoir to the outer body and back to the reservoir. Once the valve is closed the circular flow stops and the reservoir is filled up and the outer parts are emptied. It's all driven by the centripetal force from the rotating parts.

@wb3161

2 жыл бұрын

Centrifugal force makes it go from the reservoir in the center outward towards the clutches and creates a drag between them

@nssherlock4547

2 жыл бұрын

@@wb3161 And.. now explain what the OP actually asked.

@nssherlock4547

2 жыл бұрын

Basically, once the central valve is shut, and the remaining fluid is spun to the outer, a smaller diameter pipe runs from the outer, back to the tank on a slight angle.The remaining air is spun out replacing the fluid, pushing the remaining fluid back to the tank, not all is sent back, some remains but not enough to drive the fan.Hope this helps.

@wb3161

2 жыл бұрын

@@nssherlock4547 I said the same thing just without adding things that aren’t there. I can tell you really don’t actually know but not everyone needs to that’s why we all know different things others don’t know. I know exactly how it works I’ve been doing this for 37 years. They also use the same principle for all wheel and 4 wheel drive within the transfer case. As the clutch assembly rotates it has no choice but to spin the fluid from the center outward and that’s what pumps it back into the center it has nowhere else to go

Every single Toyota truck / body on frame SUV is fitted with these clutches, making that signature whoosh even in 2022.

That's clever.

Can i run a bolt thru and lok them up ? Like we did in the 70s and 80s

Mercedes diagnosis question. Visco fan clutch is attached to water pump pulley. When motor is shut off and hot, fan should still be engaged and difficult to turn because belt tension is holding water pump pulley. When motor is cold, fan clutch should free wheel with little resistance. Is this correct?

I have noticed that my viscous fan on my truck always rotates. Is the thermoexpansion valve stuck open? Great video

@largerification

2 жыл бұрын

It rotates, because there is always some drag. That is normal. The real ghetto test is to start the cold engine, see if the fan will slow down in few seconds and if it does, try stopping thebfan with a rolled news paper... If it stops, it is good. If it does not. You need to replase the clutch Do it at your own risk...!

Can you stop Viscous fan's when the fan clutch is engaged or will you injure your hand?

May Dakota 4.7 fan is so very loud, do you think it has too much oil on the clutch?

greetings for you from Iraq

Ok, so I understand all of that except one thing. How the hell does centrifical force manage to pump the fluid back to the centre? shouldn't it just fling it out to the outside and keep it there?

@peculiosa

6 жыл бұрын

Shear plate works as impeller of a pump. Shear plate's rotation is a bit faster then its housing, so it causes fluid to flow following plate's rotation. There is a small plastic part inside the housing next to(after) return hole, obstructing the flow. As flow is blocked by the plastic part, its pressure rises and fluid goes through the return hole.

@peculiosa

6 жыл бұрын

I just found that only some fan clutches have the plastic part. Others without the part seem to using fluid's viscosity itself for making the pressure.

@stupidman9774

5 жыл бұрын

Kelly Larsen . Better for you to play with jumping jacks than with machines.

@carlosmejia5728

5 жыл бұрын

Centrifugal...😎

@l337pwnage

5 жыл бұрын

@@carlosmejia5728 Centripetal. Centrifugal force is imaginary. :p

I don't see what forces the fluid back to the center reservoir when the valve closes. It seems, that centrifugal force would just keep the fluid in the outer edges of the clutch. What's the failure mechanism? Why do these go bad?

Thank understood now

Hidden technology, very cool

Thanks

3:15 how does the fluid get pumped back into the reservoir? I don't get it...I would have thought that the centrifugal forces are so high, that the fluid only comes back into the reservoir, when you switch off the engine?

Very informative video! I now understand how it works thank you. Can it be fixed if the clutch never engages?

@felipecardoza9967

2 жыл бұрын

My guess, because it is a sealed system, it cannot be repaired and must be replaced, much like a torque converter.

@MrKnutriis

2 жыл бұрын

@@felipecardoza9967 your torque converter shares oil with the transmission and is not sealed, nor does it work like a fan clutch.

@MrKnutriis

2 жыл бұрын

You can epoxy it shut until you can have it replaced.

@mann_idonotreadreplies

Жыл бұрын

@@MrKnutriis obviously once installed its sealed because if not you would leak fluids.

@mann_idonotreadreplies

Жыл бұрын

@@felipecardoza9967 Torque convertesr can be repaired but its not worth it (mass produced welded torque converters). Drag racing TCs can be repaired because its using a bolted design.

Works almost like a torque converter!

@leonardomaddoni9870

2 жыл бұрын

Yeah.. almost..

@ghenkhoash2440

2 жыл бұрын

No!

@ethics3

2 жыл бұрын

@@ghenkhoash2440 Tell us the difference Ghen

@ghenkhoash2440

2 жыл бұрын

@@ethics3 Torque converter uses fluid kinetic to transfer power, But this one uses fluid viscosity.

@LanaaAmor

2 жыл бұрын

@@ghenkhoash2440 elaborate please

Wow, tanks for that. Regards Patrick

@joncain41

6 жыл бұрын

Therefore driving the cost from 600.00 to 2500.00

So I guess the oil only needs to fill the reservoir, in excess to that fan clutch will not dis-engage. Is this correct?

@MrAirbleed

4 жыл бұрын

This type of coupler does no need any maintenance, the liquid inside is sealed for good.

Can a fan clutch turn either way, or they are meant to turn CW or CCW? I have a custom proyect and would like to know the answer for that. TY

@ryantoomey611

5 жыл бұрын

The fan will only cool in one direction depending on how the blades are angled. If it spins the wrong way there will be hardly any airflow.

@l337pwnage

5 жыл бұрын

I can't say with 100% confidence, but as I understand it the grooves that do the lock up also act as the pump, so they may not pump correctly if spun the wrong direction.

When I have viscose fan clutch go bad I just drill and tap a few holes in it then put in a few bolts to lock it up. It's not going to get much more broke. That will work temporarily till you can get it fixed.

@brianatherton4916

5 жыл бұрын

Shawn Travels The World I have did the same thing. It sounds like an airplane under the hood though

@l337pwnage

5 жыл бұрын

I guess if you lived in a really hot climate, that would make sense. You're gonna lose a lot of power and MPG, tho. They are pretty damn cheap, tho, or they used to be, and changing it might even take less time than your temp fix.

@mann_idonotreadreplies

Жыл бұрын

@@l337pwnage cool story bro.

Should a cold fan/engine free spin? Should a cold engine fan still spin on start up?

@titanicwhiz

5 жыл бұрын

It will a little bit just because it is still on a rotating assembly.. there is some drag to the fan even when not engaged.

Ok sir

On a Thermal Spring fan clutch: when vehicle is at normal operating temperature. Whould a magazine pressed against the fan blades and the blades stop be considered normal or is Fan clutch defective? How do you properly test one?

@marctronixx

3 жыл бұрын

if its engaged you should NOT be able to stop it by that method.

Nice explanation, good graphics. Now, if it wasn't too much trouble, would y'all mind saying this in the next video? "The main winding was of the normal lotus-o-deltoid type placed in panendermic semi-boloid slots in the stator" :-)

Hey, may I know if too many silicone oil will damage it? My car have slow acceleration problem after refill the silicone oil

@seansullivan4537

Жыл бұрын

🤣

is there fluid in that clutch must be service sir?

@michaelslee4336

4 жыл бұрын

Jijie Garage sealed for life.