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Author Topic: Original AC oil filter date codes  (Read 4178 times)
JohnZ
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« Reply #15 on: December 25, 2010, 12:15:45 PM »

JohnZ...Can you ask Don about mine ?

Yup, I'll pass the photos along for Don's review.
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'69 Z/28
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JohnZ
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« Reply #16 on: December 27, 2010, 10:57:49 AM »

Charley, here's Don's response on the 1100-mile '70 Z/28 oil filter photos:

"The white oil filter shell color, the black printing and the raised letter message appear to be correct for a 1970 model
Camaro. However, the length of the filter appears long.  This may be due to the camera angle.  The overall length should be 4.26 inches and the diameter inside the lockseam should be 3.524 inches.  If possible, have the owner check these dimensions.  If it is longer, it could be a PF-29 ( identified as a PF-25) that was used on 1968 model Camaros and Corvettes and replaced by the shorter PF-25 early in the 1969 model year. The PF-29 and PF-25 are functionally equivalent due to a "W" fold filter media design that permits the PF-25 to have the same internal surface area as the longer PF-29 that it replaces.
 
My analysis is based on the following AC engineering data:

The shell is white and the figures and letters are black until July 12,1970 when they were changed to a red AC "bulls' eye" and blue figures and letters.

On August 8,1968, the engineering drawings of the raised letter message was changed to " Best way to protect your engine replace with AC."

There is no documentation as to when these types of cosmetic changes are implemented in the vehicle assembly plant since they are not critical to the operation of the vehicle.  Part inventory levels and tooling change lead times and other factors affect the actual implementation date."
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'69 Z/28
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Charley
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« Reply #17 on: December 27, 2010, 02:27:57 PM »

Yes my filter is the 4.26 and 3.524. You should probably amend your earlier post that left the black lettered filter out. So it sounds like late 70 cars might get the blue letters .
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bowtie68iho
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« Reply #18 on: January 25, 2011, 03:03:38 AM »

I've been gone for a while, so I couldn't check my filter carton date until recently.  The carton for my CJ22 code only had a single "9" or "6" on the bottom flap, no other numbers, so it could be 1966 or 1969.  The vehicle applications listed on my carton are as follows:

BUICK 6 CYL.                        1968
CHEVROLET 6 CYL.  CHEVY II  1962-68
        6 CYL. (EX. CORVAIR)    1963-68
        V-8 CHEVY II                1964-68
        V-8 ALL                       1968
OLDSMOBILE 6 CYL.              1966-68
PONTIAC 6 CYL. TEMPEST      1964-65
STUDEBAKER 6 CYL.              1965-66

There is an NOS PF-29 filter on eBay.  I queried the seller about the codes and dates on his filter.  His code was JH22 and the carton date was "5-67".  So, here's what we have so far:

Carton Date           Code on filter

?- 66                     C J 22
5- 67                     J H 22
8- 67                     N H 22
5- 68                     H J 22
?- 69                     C J 22

Was the carton made before or after the filter?  How long before or after the filter?  I see an early pattern above with the second letter appearing to be the year and skipping the letter "I".  The pattern with the first letter also looks like it repeats itself, but must start some time in the middle of a year.  The "22" carries over on every filter, so it must be a plant assembly code or something...unless the PF-29 filters were only made on the 22nd of every month (highly unlikely). 

We need more examples from other CRG members to make any further hypotheses.
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Cordovan Maroon - Special Paint Exterior (black stripes)
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68Zproject
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« Reply #19 on: January 25, 2011, 05:50:39 PM »

I don't have any filter examples, but I was thinking maybe it's along the lines of the key codes with A and B for 67 and C D for 68 going up through the next model year and then starting all over again.
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68Z28
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