Ink stamp date code on 67 fan-clutch

[David L.]

Re: Ink stamp date code on 67 fan-clutch

Mike,

Thanks for the information. My theory is slowing turning into fact.

I just received an email from a NCRS member that wishes to remain nameless that he has a 18" 5-blade Schwitzer fan (stamped "912239", "SC", and "A6" for January 1966) that has an Eaton fan-clutch ink stamped "CJ" and "A29G" (January 29, 1966).

Dave

[David L.]

Re: Ink stamp date code on 67 fan-clutch

My 67 VIV 7471 has the fan as described in the opening post and a CJ stamped Eaton clutch don't remember the date or if it's visible. The car was judged 6x's, first time total deduct for fan 5/5 comment wrong next 4 judgings no issue, last judging National 2007 no deduct but comment of SRP service replacement. The addition of A/C usually throws a curve ball to the judges. JMHO

Brian,

It's starting to look like we have a case that the "CJ" fan-clutch MAY HAVE BEEN issued on the 1967 assembly line even though there is no documentation. I believe that the "CJ" fan-clutch could have been used if there was a supply shortage of the other 2 fan-clutches.

When you get a chance could you check your fan-clutch for an ink stamped date code. A small mirror might be helpful. I know that after many years the ink stampings fade and even disappear if you clean the face of the fan-clutch.

Dave

[Wayne M.]

Re: Ink stamp date code on 67 fan-clutch

.....I bought in on Ebay as shown in the link below. Doesn't it look like a 64-65 Corvette 327 w/AC fan?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=360337895634&viewitem=

...

Boy; it sure does look like the '943', without measuring the hub doughnut or the blade widths across the chord, and length's. Seller quotes 17.5" dia, but this is a difficult dimension to determine without getting fancy. Even has the mushroom head rivets.

[David L.]

Re: Ink stamp date code on 67 fan-clutch

Boy; it sure does look like the '943', without measuring the hub doughnut or the blade widths across the chord, and length's. Seller quotes 17.5" dia, but this is a difficult dimension to determine without getting fancy. Even has the mushroom head rivets.

Wayne,

Simple math, d = 2 X r. Just measure the distance from the center of the hub hole to the tip of any blade (radius) and then double it.

Based on the rust on the fan-clutch I am guessing that it is original but I am not 100% sure. The bolt circles on the fan-clutch are 3 1/4" and 1 3/4" which is quite unusual.

I tried selling it on Ebay for $120, then $75 but no interest. With the Buick fan-clutch it would bolt up to a 1964-1965 Corvette and I doubt that many judges would even notice that the fan was not original. It's a lot cheaper then the original 64-65 w/ AC fan on Ebay for $799.

Dave

[Neal K.]

Re: Ink stamp date code on 67 fan-clutch

I have 2 older fan clutches that I have had for at least 30 years. Both are Eaton and are for a big block.
One is stamped G27F and has square oil reservoirs. The other is stamped H28I and has angled reservoirs. Do I understand the discussion to mean that the G27F stands for July 27,1965 and the H28I is August 28, 1968?
Neal

[David L.]

Re: Ink stamp date code on 67 fan-clutch

Neal,

Yes, that is my opinion. Is there any other ink stampings on the fan-clutches like "CT", "CK", etc.? The ink stampings fade over the years and you really have to look very close and try different types of light.

Dave

[Neal K.]

Re: Ink stamp date code on 67 fan-clutch

Dave,
There are some other ink stampings but they are very hard to read.
I will take anotherlook with a magnifying glass and let you know what I see.
Neal

[Terry M.]

Re: Ink stamp date code on 67 fan-clutch

Dave, Not all, to the left you have the 'don't want to be that detailed or know' and to the right you have 'this should be like we build cars today'.

Everything has and had a specification, part number, drawing, and process specification and much of it was dated. The good thing is the big shows are coming up where data gathering is possible if you can get to them to look at barn find one owner time capsules.

You've got onto some good ones, keep the spirit.

Ron,
Please share with us your technique for judging these stamps with the fan clutch installed on the car -- the way the judges are expected to judge them.

[Neal K.]

Re: Ink stamp date code on 67 fan-clutch

Dave,
The clutch with the angled reservoir also has the word Eaton stamped on it and a letter C and another letter that I am unable to make out. The other clutch has no other readable lettering.
Neal

[David L.]

Re: Ink stamp date code on 67 fan-clutch

Dave,
The clutch with the angled reservoir also has the word Eaton stamped on it and a letter C and another letter that I am unable to make out. The other clutch has no other readable lettering.
Neal

Neal,

The letter after the "C" is the important letter.
"CT" = GM # 3857531, 66-67 Corvette (427)
"CK" = GM # 3916141 , 68-69 Corvette (427)
"CJ" = GM # 3916139
"CS" = GM # 3938944

Dave

[Neal K.]

Re: Ink stamp date code on 67 fan-clutch

Dave,
There is a little piece of another letter. I'll try again with a more powerful magnifying glass and letyou know.
Neal

[David L.]

Re: Ink stamp date code on 67 fan-clutch

Neal,

Is the measurement from the water pump hub mounting surface to the fan mounting surface 1.8" or 1.5"?

Dave

[Neal K.]

Re: Ink stamp date code on 67 fan-clutch

Dave,
1.5" as to both clutches. I have a 3rd clutch with the square reservoirs, but no visible ink stampings because it was painted. The shaft length is 1.5" on that one as well.
Neal

[David L.]

Re: Ink stamp date code on 67 fan-clutch

Dave,
1.5" as to both clutches. I have a 3rd clutch with the square reservoirs, but no visible ink stampings because it was painted. The shaft length is 1.5" on that one as well.
Neal

Neal,

The 1.5" fan-clutches are for big block engines.

Dave

[Tom D.]

Re: Ink stamp date code on 67 fan-clutch

Dave: How about a "GH" from Dayton (Delco Products) Stamped 222 87 and
22067542 on back side of mounting surface? 1.5 inch stem.

Also has two ink stamped arrows pointing counterclockwise. Front stamped with "DAYTON OHIO" "USA" and "DELCO PROD" "DIV GMC" 180 degrees from the Dayton - USA.

For better photos, I can e-mail you or put them on my photo site.

http://gallery.me.com/midvettecars#gallery

Thanks for your other information.

/td