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Unread 07-31-2013, 04:55 PM   #1
xcaliber81
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opinions on non oem fan clutches.

Got any just wondering what to expect from my napa fan clutch it does say made in usa. I noticed it was very stiff while turnimg it. Also it has an r with an arrow pointing counter clock ways whats that for?

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Unread 07-31-2013, 05:57 PM   #2
coralman
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Just a guess on the"r". The 4.0 has a reverse rotation water pump, so it needs a reverse rotation fan clutch. Fan clutches are supposed to be stored vertically, not horizontally or it screws with fluid inside or something like that. Whats the ambient temp you are trying to turn it in? B.C. cool right now? The ambient affects the bimetal spring which opens or closes a orifice to the fluid. If its pretty cool there it shouldn't be overly stiff I would think. Of course if its a hayden heavy clutch it may be stiff because they stay engaged longer and sound like a diesel bus fan. If the fins are alot taller on the clutch its probaly a hayden reboxed for napa.
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Unread 07-31-2013, 06:15 PM   #3
xcaliber81
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About 25degrees Celsius atm
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Unread 07-31-2013, 06:19 PM   #4
coralman
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At 77 degrees I wouldn't think it would be overly stiff but like I said it may be a hvy dty clutch.
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Unread 07-31-2013, 06:25 PM   #5
xcaliber81
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Ok I lied its 30 Celsius
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Unread 07-31-2013, 06:41 PM   #6
coralman
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Its a good bit cooler than florida.
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Unread 07-31-2013, 06:48 PM   #7
xcaliber81
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so will it be running more often now? cause right now i never hear it running. and that being said will it use more gas and take more hp away?
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Unread 07-31-2013, 06:58 PM   #8
xcaliber81
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ok so its got simular numbers as a hayden mine says 27961999. the hayden i was seeing had 27961977 on it could this be a hayden?
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Unread 07-31-2013, 07:03 PM   #9
xcaliber81
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here are some pics.
20130731_165906.jpg

20130731_165921.jpg

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Unread 07-31-2013, 09:08 PM   #10
coralman
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It looks like one sure enough. Try it. See, on my 98 the clutch is no longer available since it was a one year shot. Most likely they changed the clutch specifications because they dropped the external trans cooler unless you had hvy dty cooling or towing or some such. As a preventative move I changed mine out to the hayden. Yep it ran longer and jeez it was loud. I put my original back on. Don't know if there are even more choices available for the 94 or the 98. Seemed like I saw a company called tempatrol that made fan clutches but I don't know about the quality. I just pulled spares out of the jy and store them vertically.
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Unread 07-31-2013, 09:32 PM   #11
xcaliber81
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Just took it for a spin and it only ran for about 1 min or so and I heard it tone down. I swear I never heard my fan turn on ever. When I took the old one off I saw red paint on it like what a scrap yard would do.
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Unread 07-31-2013, 09:36 PM   #12
coralman
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Good! Hope it stays that way.
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Unread 08-01-2013, 11:12 AM   #13
Uniblurb
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Glad it's working for you! Is it not so tight and turns easier by hand now? It's my understanding when you install a new fan clutch you have to rev it up/drive it a bit to heat it up and distribute the silicone oil throughout the clutch cavity.

In doing some searching late last night I ran into an interesting non-Jeep forum thread where some where changing the silicone oil in good/working fan clutches to different viscosities. They were doing this depending if they wanted the clutch to kick on less when cold and more when hot. The products they were using was a "CST silicone oil" with "differential" on the label bought from hobby stores.

I'm not suggesting you try this on a new fan clutch where it may leak from the seal but just thought it was interesting.
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Unread 08-01-2013, 11:49 AM   #14
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I bought a "severe duty" for my '04 Durango a couple years ago. May as well have not had a clutch because it wouldn't turn off for anything. Exhcanged it and the new one was the same way. Maybe once/twice a week my ZJ's clutch will be engaged in the morning until the first time I go over 2k RPM then it quits.
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Unread 08-01-2013, 12:18 PM   #15
xcaliber81
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Its pretty tight when I turn it by hand much tighter than the old one untill its warmed up then it loosens up
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