Fan clutch

[Ken A.]

Re: Fan clutch

I believe the production clutch was the Schweitzer "bar type" and the Eaton spring was the service part. If you look at production line photos of the C-2's you will only see "bar types". There is only one company making repros, as of this writing. BTW, the judging guide is incorrect in this instance.

[Domenic T.]

Re: Fan clutch

Donald & Ken,
Thanks for the info. That got me a bit confused. Which is the best in your oninions? I hear a bunch about the spring being moved to change the lock up temp.

DOM

[Donald A.]

Re: Fan clutch

Donald & Ken,
Thanks for the info. That got me a bit confused. Which is the best in your oninions?

Hi Dom - I prefer the Eaton clutch as have had good luck over the years and just prefer them as they are correct for mid-years. However, as I stated above, the Judging Guide confirms either type is correct for your '67. As far as the comment above from the member stating "the judging guide is incorrect in this instance" well I have to disagree. The Judging Guide represents the consensus of opinion of at least 18 experts in these areas, and they say that both clutch types are correct for judging, both were production units. I prefer to use the published facts in the Judging Guide to make these type of restoration decisions, so I went with an Eaton fan clutch. Now as to the "best" for you, it depends on what you are after. Do you want 100% correct NCRS? If yes then either type is fine, but you need to find a restored original, or buy an original core on eBay or elsewhere and have it restored. That is what I did. If you want "mostly correct" then repro units are fine, and the picture above in this thread of the repro Eaton unit is fairly close to original, but not totally accurate. The difference, however, between close looking repro and restored original is several hundred dollars, so that factors in as well! If you want original, just do your research and understand what the correct original units look like, get the Judging Guide and do searches here and elsewhere and study the photos. Good luck!

[Francis F.]

Re: Fan clutch

I notice on the box it came in "STORE THIS SIDE UP" would that be the position that it is in the picture ??
Francis

[David L.]

Re: Fan clutch

I notice on the box it came in "STORE THIS SIDE UP" would that be the position that it is in the picture ??
Francis

Francis,

The fan-clutch was face down when I took it out of the the box. When I took the photo I flip the fan-clutch over so that the face was visible and you could see the stampings, etc.
"STORE THIS FACE DOWN" is stamped join the face of the fan-clutch.

Dave

[Domenic T.]

Re: Fan clutch

Guys,
I found a new Hayden 2711 clutch on the shelf that was bought in 1994. Forgot who or what it was bought for, or just to stock because it has a wide range of cars it can be used on.
I decided to use it on my 67 BB after calling Hayden and talking with them about the temp range. They said it started at 180 and was fully engaged at 200. The fit in the shroud and fan was good.
I read in another thread that turning the coil CCW would start it to engage it at a lower temp. Is that one full turn, as it only has one notch?
Thanks, I do plan to get the correct one later.

Dom

[Leif A.]

Re: Fan clutch

Guys,
I found a new Hayden 2711 clutch on the shelf that was bought in 1994. Forgot who or what it was bought for, or just to stock because it has a wide range of cars it can be used on.
I decided to use it on my 67 BB after calling Hayden and talking with them about the temp range. They said it started at 180 and was fully engaged at 200. The fit in the shroud and fan was good.
I read in another thread that turning the coil CCW would start it to engage it at a lower temp. Is that one full turn, as it only has one notch?
Thanks, I do plan to get the correct one later.

Dom

Dom,
Is there a corresponding metal tab 180 degrees from the current notched location? Mine had such a tab and I used a Dremel to notch it. Only turned the coil 180 degrees...seems to work just fine.

[David L.]

Re: Fan clutch

I can see why a universal GM/Ford Hayden 2711 fan-clutch can be used.
The "thickness" of the Hayden 2711 fan clutch (7 1/4" dia.) measures about 2.97" and the distance from fan mounting surface to water pump mounting surface measures about 1.42".
The "thickness" of the 3916141 fan- clutch (6" dia.) measures about 2.83" and the distance from the fan mounting surface to the water pump mounting surface measures about 1.58".
When mounted on the engine the 2711 fan-clutch is actually about 0.16" closer to the water pump than if a 3916141 was used.
I bought this Hayden fan-clutch at a swap meet years ago for $10. It's not correct but for $10 who really cares. A sleeve measuring 0.74" O.D., 0.64" I.D., and 0.60" long is included.

Dave

[Domenic T.]

Re: Fan clutch

Leif,
Thanks, that's what I needed to know. I will get my dremel out.

Dom

[Jack M.]

Re: Fan clutch

Leif,
Thanks, that's what I needed to know. I will get my dremel out.

Dom,

You might not need to add a notch... perhaps you can rotate the spring 185* CCW and place it on the right side of the tang.
See page #2... top right photo & description: CLICK HERE

Hope that helps,
Jack

[Patrick B.]

Re: Fan clutch

I have a few old fan clutches. How do you tell the difference between one for BB and SB? Is there any way to tell if they are in working order?

[Leif A.]

Re: Fan clutch

Dom,

You might not need to add a notch... perhaps you can rotate the spring 185* CCW and place it on the right side of the tang.
See page #2... top right photo & description: CLICK HERE

Hope that helps,
Jack

Jack,
I saw that picture, as well. IMHO I think the notch more securely holds the coil in place. I'm guessing that's why it was notched originally instead of being place just to the side of the tang.

[Francis F.]

Re: Fan clutch

thank's David,I have an extra unit and want to store it properly.
Francis

[Joe L.]

Re: Fan clutch

I have a few old fan clutches. How do you tell the difference between one for BB and SB? Is there any way to tell if they are in working order?

Patrick-------


The only visible difference, if not the only difference, is the shaft length. The big block clutches generally have a slightly shorter shaft length than small block. However, there are some fan clutches that were originally used for both small block and big block applications. The shaft length difference ended after 1970. Also, the GM #3916141 was originally a big block fan clutch with the slightly shorter shaft but it became SERVICE many years ago for most 1960-1970 Corvette applications, big block or small block.

[David L.]

Re: Fan clutch

thank's David,I have an extra unit and want to store it properly.
Francis

The Schwitzer fan-clutches are stored with the face side UP. I found the photo below of a restored Schweitzer fan-clutch on the web. I sold all my Schwitzer fan clutches years ago.

Dave