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Old 09-28-2017, 01:32 AM   #11
hkpierce
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Default Re: Viscous Fan Clutch Replacment

While I was in the process of replacing my water pump, idlers, tensioner, serpentine belt, plastic fuel lines and rebuilt high pressure pump, I noticed that my fan's springs were quite rusty. Playing around with them a pin under the springs disappeared.


As this was the least of my troubles, I decided not to invite fate. So I bought a new Meyle fan. I note the gasket around the pin. I have no idea what the pin does.

Last edited by hkpierce; 09-29-2017 at 01:14 AM.
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Old 09-28-2017, 08:58 AM   #12
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Default Re: Viscous Fan Clutch Replacment

The copper colored plate is a bimetallic spring. It will invert at a specific temperature. The pin will thus be pressed inwards. This locks the clutch. The green gasket/seal prevents the viscous fluid from leaking out.

The bimetallic spring determines the lock up temperature of the clutch. Being in the radiator airflow, it will be close to the coolant temperature.
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Last edited by Midwestdrifter; 09-28-2017 at 09:00 AM.
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Old 09-29-2017, 12:22 AM   #13
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Default Re: Viscous Fan Clutch Replacment

Quick question: How do I know the viscous clutch is in need of replacement? The wife and I had a couple summer road trips where the engine temp started to rise on long uphill grades with the a/c on.
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Old 09-29-2017, 01:11 AM   #14
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Default Re: Viscous Fan Clutch Replacment

Quote:
Originally Posted by bcman View Post
Quick question: How do I know the viscous clutch is in need of replacement? The wife and I had a couple summer road trips where the engine temp started to rise on long uphill grades with the a/c on.
See Post 5 above.
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Old 09-29-2017, 03:04 AM   #15
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Default Re: Viscous Fan Clutch Replacment

You might like to take the radiator core support X member off & separate the cooling pack and thoroughly clean it.

One we did very recently knocked 7 Celcius off the top pipe temp when under full load & that included a full internal cooling system system flush as well.
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Old 10-01-2017, 03:47 AM   #16
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Default Re: Viscous Fan Clutch Replacment

There is a good post on separating the cooling stacks and cleaning them. Ir really helps to have a long stiff bottle brush.

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Old 08-22-2018, 12:03 AM   #17
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Default Re: Viscous Fan Clutch Replacment

1) Lift up the radiator fan shroud and pull it toward you, the front of the van - you will now be able to look down and see the head of the allen bolt that holds the clutch on.
[/QUOTE]

I just went through the process myself and found that the plastic shroud on my '05 fully encompasses the fan & clutch so even after I unclipped everything I was unable to pull it up or towards me.

Luckily/unluckily the plastic shroud was cracked so I was able to gently pull the larger part of the wishbone aside.

I am curious if you (or anybody) has pics of how they did this step without the crack in the plastic mine had.
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Old 05-09-2019, 02:33 AM   #18
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Default Re: Viscous Fan Clutch Replacment

Solid write up, though I didn't hit the 20 minute mark. Maybe 40, mostly due to figuring out how to stop the pulley from slipping. A couple additional tips:
-The drivers side clips on the fan shroud are easier to remove and replace from underneath.
-Putting the plier jaws on the rivets (I think they're rivets) on the front of the pulley makes it a lot easier to keep it in place.
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Old 06-04-2019, 06:10 PM   #19
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Default Re: Viscous Fan Clutch Replacment

I replaced the viscous fan clutch for the second time. The first time I used a no name knockoff. It self destructed in two years. This time I used a Febi-Bilstein OEM from Europarts with a new fan blade too. The old clutch is on the right. The bearing tore itself up and pieces fell off when I removed it. Luckily it stuck on, so I had plenty of cooling and noise!

Fan_1.jpg

The old fan blade was the original. The new one looks different.

Here is a closeup of the destroyed bearing on the old one.

Fan_2.jpg

Regards,

Mark
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Old 06-04-2019, 08:28 PM   #20
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Default Re: Viscous Fan Clutch Replacment

The original fan looks slightly asymmetric ... the blades don't appear to be spaced evenly.
(but it could simply be the slight angle of the photo)

I wonder if that's to avoid setting up some resonances?

--dick
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