Fan clutch question

[HuskerJeep]

I'm doing some searching on replacing my fan clutch, and based on what I've read about the HD Hayden clutches' increased noise level and extra load on the engine I've been trying to locate the best Standard Duty clutch. Here's what I found:

1. When I search for the OEM clutch on Tasca for the '98 4.0L, I get a part number of 68064764AA, which replaces part number 52027892. Both of these are discontinued.
2. On Hayden's website, there is a place to enter part numbers for cross reference. I put both of the Tasca numbers in and the Hayden clutch that comes back is 2625 (for reference, the 2737 is the HD fan).
3. Even more interesting is going to Oreilly's site. They return 2 fan clutches for the '98, with the Murray brand name. The "non-thermal" clutch is model #2625 and the "Thermal" clutch is #2737. Same model numbers as Hayden. Autozone's Duralast clutch is #922737.
4. To make it more confusing, the compatibility charts on Amazon, eBay and Oreilly's show that the Hayden 2625 is not compatible with my model year/engine ('98 4.0l).

In summary, Hayden says the 2625 works for both the 4 cyl. & 6 cyl. but all the others indicate that it doesn't work for the 6 cyl. and point to the 2737 HD version as the proper OEM replacement.

Can anybody chime in who has installed/used the Standard Duty fan clutch?

 

[danof76]

@Chris recommends this fan clutch (the 2737) as per his Jeep Wrangler TJ Cooling System Overhaul FAQ for a 1998 4.0L. There's exhaustive research behind those recommendations from what I've seen and it's often corroborated by some pretty experienced people in and out of the industry. I'd get the 2737 if I were you.

 

[AustinLonghorn]

I'm doing some searching on replacing my fan clutch, and based on what I've read about the HD Hayden clutches' increased noise level and extra load on the engine I've been trying to locate the best Standard Duty clutch. Here's what I found:

1. When I search for the OEM clutch on Tasca for the '98 4.0L, I get a part number of 68064764AA, which replaces part number 52027892. Both of these are discontinued.
2. On Hayden's website, there is a place to enter part numbers for cross reference. I put both of the Tasca numbers in and the Hayden clutch that comes back is 2625 (for reference, the 2737 is the HD fan).
3. Even more interesting is going to Oreilly's site. They return 2 fan clutches for the '98, with the Murray brand name. The "non-thermal" clutch is model #2625 and the "Thermal" clutch is #2737. Same model numbers as Hayden. Autozone's Duralast clutch is #922737.
4. To make it more confusing, the compatibility charts on Amazon, eBay and Oreilly's show that the Hayden 2625 is not compatible with my model year/engine ('98 4.0l).

In summary, Hayden says the 2625 works for both the 4 cyl. & 6 cyl. but all the others indicate that it doesn't work for the 6 cyl. and point to the 2737 HD version as the proper OEM replacement.

Can anybody chime in who has installed/used the Standard Duty fan clutch?

Same situation here; the Mopar fan clutch is officially discontinued (but still available here and there for ~ $120), Napa only lists the HD clutch for the 4.0, etc.

I found this thread, confirmed (again) through the Hayden cross reference search for 68064764AA, and decided to give the 2625 a shot over the weekend ('97 TJ 4.0); I'll let y'all know how it goes.

 

[HuskerJeep]

Same situation here; the Mopar fan clutch is officially discontinued (but still available here and there for ~ $120), Napa only lists the HD clutch for the 4.0, etc.

I found this thread, confirmed (again) through the Hayden cross reference search for 68064764AA, and decided to give the 2625 a shot over the weekend ('97 TJ 4.0); I'll let y'all know how it goes.

That's great, can't wait to hear what you come up with. Thanks for giving it a try.

 

[AustinLonghorn]

OK - turns out our TJ had a heavy duty fan clutch on it, but probably aftermarket by the first owner (~ '97-'08), since it's stamped "DELCO CHASSIS USA" (with no other identifying part numbers or Chrysler/Mopar markings).

The new 'standard duty' 2625 fan clutch is noticeably quieter. Engine temps seem fine, hovering just below 210 like normal. We'll see how it does in the summer? The rest of the cooling system is "new" (I put in a new Mopar rad, Mopar thermostat, AC Delco water pump and hoses about two year ago).

I had to go buy a shorter non-A/C serpentine belt to actually go test the thing out on the road; the bearings in the A/C compressor clutch decided to give up the ghost while I was running the engine at 2K RPMs for two minutes to prepare the Hayden fan clutch per the factory manual (new loud noise + burning smell !! was great fun).

Here's the new Hayden 2625 for comparison next to the old fan clutch, front and back. FWIW, I read somewhere that you shouldn't put these things flat horizontally if you're planning on using them again (other than before initial use/shipment, of course):

Amazon stocks these (alongside the heavy duty one that was recommended earlier in the thread):

Installed:

 

[HuskerJeep]

That's good stuff, and I'm glad to hear it seems to be operating normally so far. I like the idea of the quieter option as long as it keeps everything cool. Thanks.

 

[RaymondT]

That situation was common with GM trucks years ago. If you put the HD version on, you got a lot of extra noise as the fan always bit harder. I recall tossing the Hayden in the big blue bin after a few months and going back to OEM.

These types of fan clutches don't fail all that often. They work by heat expanding the visible thermal coil causing the center to rotate the internal valve, redirecting fluid into cast vanes causing resistance. Simple and reliable unless fluid leaks out.

 

[khakitj]

Any longer term reports on the 2625?

 

[HuskerJeep]

I finally put mine in last week, so I don’t have any long term info yet. Maybe one of the others can chime in.

 

[khakitj]

I’m also seeing conflicting info on whether it fits the 2005 or just the earlier model years.