Fan clutch replacement guidance and recommendations
- Thread starter j_anderson
- Start date
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get yourself an infrared heat sensing gun (I got a cheap one at Harbor Freight that works just fine). You can check the temp at the thermostat housing by the temp gauge sensor at start up through fully warmed up and you can figure out actual temps at various gauge readings. It might be that you just need to recalibrate your perception of what the gauge readings really mean. Then you can search around with the gun for sources of heat in the engine compartment
Hayden #2947 replacement clutch, that's what I have on my all stock '72. Also helps to make sure that your radiator and or A/C condenser isn't full of bugs etc. Besides all of the things mentioned here.
I replaced the fan clutch today. It seems to have taken care of the heating issue!
Thanks everyone for your input and thanks @str12-340 for the reference temps for comparison.
Thanks everyone for your input and thanks @str12-340 for the reference temps for comparison.
Make sure you have all the hood gaskets and underhood seals present and in good condition. That cured a similar problem. KISS.
They are all there. All brand new. All installed at the end of my complete restoration.
This is where my temp gauge rides now. it'll climb slightly at idle but still stay below the halfway point.
Thank you for mentioning the seals, have you had good luck with a particular company ?
I used Detroit Muscle Technologies seals and gaskets pretty extensively on my restoration. Great company, fair prices, fast shipping
MidnightSwinger
Well-Known Member
which clutch did you go with?
Hayden 2747. I had to use a washer between the clutch and blade assembly for clearance. I think it was 1/16” thick washers
The clutch body was touching the fan. Adding a slim washer made the clutch body not touch the fan
No, I bought the 2747. I had already ordered it based on information I had gotten. Looking back at 2947 is a low profile unit. Probably don’t need the clearance washers on that one.
No, I bought the 2747. I had already ordered it based on information I had gotten. Looking back at 2947 is a low profile unit. Probably don’t need the clearance washers on that one.
So what's the distance from the rad to the blade tip ? The Hays unit I got said 3/4 inch
Judging solely on how it looks in relation to how deep the fan sits in the shroud , it’s basically in the same position as the factory Eaton unit that was replaced.
I’ll have to measure it next time I’m around the car. It’s stored an hour away in a shop where I’ve been working on it
slantsixdan
=..=
From the factory (no guarantee with aftermarket), a heavy-duty fan clutch, along with being of sturdier construction, has an idle lock-in feature: the fan is driven at engine idle, no matter what the thermostatic coil has to say about it. That improves A/C performance and guards against overheating in stuck-in-traffic situations.
Classic Industries is a garbage company selling garbage parts at LOLROFL prices. They're on my always-avoid list.
Classic Industries is a garbage company selling garbage parts at LOLROFL prices. They're on my always-avoid list.
1-3/8” at the end of the blade, 1-1/8 at the edge up near the fan clutch
Fan clutch is 7/16” away from rad
Fan clutch is 7/16” away from rad
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