I know there's a good write-up on this on 4crawlers site (link below) but I wanted to share my experience.

http://www.4crawler.com/4x4/Docs/FanClutch.pdf

I've had a a slight over-heating issue on my 93 22re for years that only occurred during slow speed wheeling - more noticable during the hotter weather. The temp would jump back to normal and would never climb during normal driving.

Anyway, I've read many ways to 'test' the fan clutch by feel and resistance of the fan. In my case it was rather easy to turn regardless of the temperature under the hood. To my surprise it was just as easy to spin after adding one 18ml bottle of silicone (1 bottle filled it). But, I can confirm this did the trick after 8 hours of crawling in 90-100 degree weather -temp guage did not move a bit out of the normal range. In addition I can actually hear the 'wooshing' of the fan now.

* Remove 8 of the phillips screws that hold the case together
* Carefully separate the 2 halfs (mine was easy and the o-ring stayed in place). This is what a poorly working one looks like - you can see each of the 'holes' were lacking silicone.



* I did not remove the old silicone - looked fine and I don't think it 'breaks down' anyway.
* Started filling the lower half of the clutch by filling the 3 or 4 holes (depending on year). I filled mine until it started to seep past the o-ring groove. It only took one 18ml bottle - it takes 50 ml if it's completely empty. Unfortunately I don't have a picture of this.
* Bolted the 2 halfs back together - done.

18 mL silicone part number > 08816-03001 (local dealer had to order it)

 

Moved but that attachment doesn't seem to work.
Try uploading pics to something like photobucket.

:wabbit2:

 

My mistake. Fixed.

 

How much for the silicone at the dealer for each 18 ml bottle? On the reassembly did you use any red or blue locktite on the screws?

 

I can't remember exactly but it was between 5-10 bucks per bottle.

I didn't use locktite.

 

Just so you guys know a good source for the silicone oil is also your Local Hobby Shop (Read: RC cars).

We use silicone oil for shock oil and differential oil and there are many different weights available.

I have used it in 2 different clutch fans for 22re's using the 8,000 weight oil and both work perfectly.

Price may be a little less than the dealer too.

 

Thanks for the great info and pics. My symptoms are a bit different than yours were, as my temp seems ok sitting still and running 30 to 40 mph on flat roads, but when going uphill on mild grade in 3rd gear 2300 rpms or so the heat begins to rise and even after back on flat road engine seems very slow to cool back down. I don't have a hobby (rc car) shop anywhere near but do have a spare fan clutch so I'll swap them today and see what happens. Will try to find source of silicone fluid as well. Again, thanks for your response. RF