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Author Topic: 68 Z clutch fan  (Read 8660 times)
68Zproject
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« on: May 19, 2008, 07:41:12 PM »

This is kind of a two-parter.
1)  I bought a 68 GM fan clutch a while back and put the aftermarket fan I had on that.  The fan was kind of universal, so it fit this clutch.  I didn't really pay attention but I found that the fan clutch spacing, on the fan clutch, was only 3".  Does someone make a repo or does GM have a 3 1/4" fan clutch?
#2)  I finally found a fan that is an 18" 5 blade fan like the original Z28 fan with a 3 1/4" fan clutch spacing.  But it has 5 rivets instead of 4.  What could this be for?
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68Z28
fireZ
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« Reply #1 on: May 20, 2008, 07:01:05 AM »

I have had one of those fans also and was told it was a Corvette fan blade. I have looked for 5 years for the correct four rivet fan for my 68 Z but I am not in the position to pay 2000 for the correct set-up. Mine was disguarded years ago for a 7 blade flex fan. I will keep hunting and for now use the 5 rivet blade.
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1968 Z28 LA Built
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JohnZ
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« Reply #2 on: May 20, 2008, 09:43:22 AM »

1960-1970 Corvettes used the clutch with the 3" fan attaching bolt circle; it changed to 3-1/4" in 1971. Eaton still makes new clutches in both the 3" and 3-1/4" bolt circle versions - the 3" version is GM #3916141, don't have the part number handy for the 3-1/4".
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'69 Z/28
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1968RSZ28
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« Reply #3 on: May 20, 2008, 03:21:00 PM »

I have looked for 5 years for the correct four rivet fan for my 68 Z but I am not in the position to pay 2000 for the correct set-up. Mine was disguarded years ago for a 7 blade flex fan. I will keep hunting and for now use the 5 rivet blade.

$2000.00 is cheap in today's market.  Here's an original '68 Z/28 fan and clutch that recently sold on Ebay for $4218.73...

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=140228611059&ssPageName=STRK:MEWA:IT&ih=004

That's more than the whole car cost new!!     Grin

Here's an original '67 Z/28 fan clutch (dated 2-17-67) that recently sold on Ebay for $3419.00...

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=260238241703&ssPageName=STRK:MEWA:IT&ih=016

Congratulations Charley!     Smiley

Paul
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fireZ
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« Reply #4 on: May 20, 2008, 03:29:45 PM »

Well I can forget about ever getting the correct fan for my car unless I come across one at a swap meet and the vendor does not know what it is. I will have to take a copy of that Ebay ad and shows the guys that are kind enough to point out I have the wrong fan on my otherwise completely original Z . I cannot blame the guys that have them for getting as much as they can for them. It guys like me that took our originals off years ago that I can blame for the prices.
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1968 Z28 LA Built
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1968RSZ28
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« Reply #5 on: May 20, 2008, 03:40:20 PM »

Tell me about it, I bet I could part my car out for more than I could sell it whole!!     Wink

Paul
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fireZ
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« Reply #6 on: May 20, 2008, 04:09:09 PM »

Oh well I guess that we can both be happy knowing we do own original 68 Z28s even if we are missing our 4 rivet fans.
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1968 Z28 LA Built
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1968RSZ28
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« Reply #7 on: May 20, 2008, 04:36:29 PM »

Oh well I guess that we can both be happy knowing we do own original 68 Z28s even if we are missing our 4 rivet fans.

I still have the original fan on my '68 Z/28!!     Smiley

I probably should chain the hood down!!     Sad

Paul
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« Reply #8 on: May 20, 2008, 06:18:44 PM »

Chain it down and put a dog on the chain. See Ya Paul
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1968 Z28 LA Built
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68Zproject
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« Reply #9 on: May 20, 2008, 07:59:13 PM »

What's your address Paul?
I will get a picture.  The fan I have says 68 H and FRONT on it just like the 4 rivet ones.
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68Z28
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« Reply #10 on: May 20, 2008, 11:59:54 PM »

1960-1970 Corvettes used the clutch with the 3" fan attaching bolt circle; it changed to 3-1/4" in 1971. Eaton still makes new clutches in both the 3" and 3-1/4" bolt circle versions - the 3" version is GM #3916141, don't have the part number handy for the 3-1/4".
Do you know what these 3 1/4" vette fans said on them?   If you come across the 3 1/4 fan clutch part # I would be very thankful.  No hurry.
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68Z28
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« Reply #11 on: May 21, 2008, 02:04:28 AM »

What's your address Paul?

 Roll Eyes

The fan I have says 68 H and FRONT on it just like the 4 rivet ones.

I just looked at my fan.  I see the "H" and "FRONT" you mentioned stamped on the front side.  There is also a "W" stamped on the back of the fan.  I don't see the "68" on my fan unless it hidden under the fan clutch.     Tongue

Paul
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Jerry@CHP
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« Reply #12 on: May 21, 2008, 06:26:05 AM »

These fan blades are not date stamped, many of the fan clutches are though.

Jerry
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1968RSZ28
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« Reply #13 on: May 21, 2008, 11:53:45 AM »

These fan blades are not date stamped.

Thanks Jerry!  That's why I couldn't find the "68" stamp he mentioned, it's not there!  You saved me the trouble of unbolting the fan clutch to check.     Smiley

Paul
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68Zproject
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« Reply #14 on: May 23, 2008, 10:03:28 AM »

]
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68Z28
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« Reply #15 on: May 23, 2008, 09:11:47 PM »

All three of my original 68z fans have four rivets per blade.Also the clutches are dated on the hub edge and they have silver paint from the factory. John
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68Zproject
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« Reply #16 on: May 24, 2008, 01:26:17 AM »

I'm just trying to find out what this was for.  If the 68 is 1968, then it didn't come off the later Corvette.  Maybe it's an 89?
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68Z28
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« Reply #17 on: May 24, 2008, 09:35:33 AM »

All three of my original 68z fans have four rivets per blade.Also the clutches are dated on the hub edge and they have silver paint from the factory. John

Most of the Schwitzer (flat plate) clutches are dated on the hub O.D., but the Eaton (coil element) clutches aren't.
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'69 Z/28
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« Reply #18 on: May 24, 2008, 08:48:43 PM »

Hello John , Did you ever see the hubs painted bright silver?  John
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JohnZ
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« Reply #19 on: May 25, 2008, 03:28:40 PM »

Hello John , Did you ever see the hubs painted bright silver?  John

Part of the shaft was painted silver on Schwitzer clutches, but not on Eaton clutches.
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68Zproject
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« Reply #20 on: May 27, 2008, 07:12:18 PM »

So John Z, did this fan of mine come off a Corvette?  If so what application was it for?
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68Z28
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« Reply #21 on: May 28, 2008, 10:17:24 AM »

So John Z, did this fan of mine come off a Corvette?  If so what application was it for?

I don't know what the application might have been - the 3" bolt circle Corvette fans had five rivets.
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68Zproject
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« Reply #22 on: May 28, 2008, 10:39:28 AM »

Thank you.  I guess the hunt is still on for what this fan was for?  It is a 3 1/4 " bolt circle.
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68Z28
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« Reply #23 on: August 10, 2009, 06:07:41 PM »

1960-1970 Corvettes used the clutch with the 3" fan attaching bolt circle; it changed to 3-1/4" in 1971. Eaton still makes new clutches in both the 3" and 3-1/4" bolt circle versions - the 3" version is GM #3916141, don't have the part number handy for the 3-1/4".

Anyone ever find out a part # for the Eaton 3-1/4" fan clutch?  Also, I have my fan on Ebay and a guy sent me a message saying that fan is for the L78 and that the 4 rivet blades weren't strong enough for the big block motor.  The logic escapes me and if that were true, I guess it would have been mentioned in Jerry's book.  But no one has really said what this one was for.
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68Z28
TODD
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« Reply #24 on: August 12, 2009, 08:31:09 PM »

So is this a correct 4 rivet 5 blade 68 Z28 fan?
http://cgi.ebay.com/ebaymotors/66-67-68-69-Camaro-Corvette-Chevelle-Nova-5-Blade-Fan_W0QQcmdZViewItemQQ_trksidZp3286Q2ec0Q2em14QQhashZitem3354c9c4f3QQitemZ220465841395QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
Item # 220465841395

Todd
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Jerry@CHP
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« Reply #25 on: August 12, 2009, 09:20:27 PM »

Nope, it has to have the 3 1/4" bolt circle.  Same as '67 L78.

Jerry
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68Zproject
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« Reply #26 on: August 13, 2009, 02:16:41 AM »

So Jerry, is this guy blowing smoke about my fan in the picture being for an L78?
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68Z28
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« Reply #27 on: August 13, 2009, 12:25:54 PM »

Tell me about it, I bet I could part my car out for more than I could sell it whole!!     Wink

Paul

Yea Paul, between your 266 dizzy and that fan your're well on your way (along with a few other original parts - via eBay) toward buying a new 'retro' version... if that appeals.
Makes one wonder doesn't it? I passed on a badly wrecked '69 Z years back with less than 20k miles on the OE drivetrain - wish now I had bought it for the few hundred it would have taken and just tossed the body minus any of the now valuable trim parts that survived and stored the rest for times like these...
Probably like most I wouldn't have waited this long to sell it all off - but just think what something like that would have brought piece by piece in today's world!
Randy 
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jdv69z
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« Reply #28 on: August 13, 2009, 02:15:46 PM »

So are the 69 Z clutch fans this expensive, or is it just the 67/68 Z version?

Jimmy V.
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Jimmy V.
68Zproject
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« Reply #29 on: August 13, 2009, 02:25:38 PM »

Usually it's the 67 and 8 z and L78 fans that are big bucks.
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68Z28
68Z22
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« Reply #30 on: August 13, 2009, 07:10:02 PM »

Thanks for the education on fans and fan clutches for 68 Z28',
Can you guys tell me if the following fan and fan clutch are
correct for my 68 327/275 w/AC :
Fan # 3931002   Date Code A68
Cutch # 5389475 Date code 009    68

68z22
Lemans Blue
327/275 w/AC
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Mark
68 Z22 Coupe
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327/275
68Zproject
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« Reply #31 on: August 13, 2009, 08:06:32 PM »

http://www.camaros.org/coolingsystems.shtml
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68Z28
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