Date on this fan clutch?

[Mike E.]

I tried navigating the archives--didn't find a definitive answer. What would the date be on this fan clutch? CJ H311 ? H 31I ?

[Ridge K.]

Re: Date on this fan clutch?

I tried navigating the archives--didn't find a definitive answer. What would the date be on this fan clutch? CJ H311 ? H 31I ?

Mike, on the Eaton fan clutches the date code is a simple month-day-year with the month being a letter code A= January, and letters again for the year, A= 1970.

I would read your date code as H31I, with the last character an "I", not a numeric "1".
My read would be August 31st, 1978, BUT, I am not an expert on these.
A good source might be Fred Oliva's website:

http://www.gate.net/~foliva/

Hope this helps somewhat. Maybe others can confirm. Ridge

[Mike E.]

Re: Date on this fan clutch?

Fred's site ha nothing about dating that I could find. This fan is an earlier style than 78--thanks for the help--someone else?

[Larry M.]

Re: Date on this fan clutch?

Info from my files indicates that the date coding is as follows:

First letter represents the month with January = A
The number(s) are the day of the month
The last letter represents the year with 1960 = A

Based on this, the H31I codes out to August 31, 1968.

Larry

[Wayne M.]

Re: Date on this fan clutch?

Fred's site ha nothing about dating that I could find. This fan is an earlier style than 78--thanks for the help--someone else?

Anyone know the design change date from square reservoir "wings" to the tapered type shown in Mike's pic ?

[Larry M.]

Re: Date on this fan clutch?

Anyone know the design change date from square reservoir "wings" to the tapered type shown in Mike's pic ?

Wayne:

My 1967 Eaton clutch is style one and is dated March 1967. The one Mike Ernst asked about is style two and appears to be August 1968.

Change has to be between the two dates. I would guess at the beginning of the 1968 or 1969 model year, but that is a guess on my part. It could also have been a running change sometime in late 1967 - early 1968.

Perhaps someone with an original car w/Eaton type clutch can narrow it down from there.

Anything in Nolan's book Volume 2?? I'll check it out and let you know.

Larry

[Mike M.]

Re: Date on this fan clutch?

Spot on, Larry.
Actually the two styles; Eaton coil type wth a stepped shaft and curved fins and the flat thermostaticly contolled Scwitzer unit without a step in the shaft and with straight fins were used interchangeably throughout the Mid-Year models. Both shafts were 1.8" in length, however, a shaft length of 1.5" was introduced in '66 for the Big Blocks, identified by a "CK" stamp on the face. ("CJ" for SB's)
I believe this continued in '68, don't about later cars, maybe some "Sharksters" will jump in.
HaND