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Author Topic: Original AC oil filter date codes  (Read 4349 times)
bowtie68iho
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« on: December 18, 2010, 08:01:45 PM »

Does anyone know how to decode the date code on original AC oil filters?  I've seen one with the date code "CJ22" in light blue screen print ink ( same color as other text) on the side.  Is the "C" for Chevrolet?  Is the letter "J" for the month begininng in January or the model year?  Did the months skip the letter "I"?  I assume the "22" is the 22nd day of whichever month is applicable.
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JohnZ
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« Reply #1 on: December 19, 2010, 01:53:28 PM »

Does anyone know how to decode the date code on original AC oil filters?  I've seen one with the date code "CJ22" in light blue screen print ink ( same color as other text) on the side.  Is the "C" for Chevrolet?  Is the letter "J" for the month begininng in January or the model year?  Did the months skip the letter "I"?  I assume the "22" is the 22nd day of whichever month is applicable.

A friend of mine worked at AC Engineering, and was a supervisor on the filter line for several years; I'll bounce this past him and see what he says, and post his response.
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'69 Z/28
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JohnZ
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« Reply #2 on: December 20, 2010, 10:21:28 AM »

Here's Don's response - he has conducted many NCRS Tech Sessions on AC oil filters, and has hundreds of them in his collection; do you have photos of the filter?

Pf-25's were painted white with blue silkscreening until mid-1974 with no date codes
Pf-25's were painted blue with paper/foil labels from late 1974 to early 1976 with no date codes
Pf-25's were painted blue with paper labels starting in mid-1976 with no date codes at least through 1982.
The first examples I have of what may be date codes are PF-25's in replacement AC-Delco boxes as follows:
Carton Date: 6-97   Code on filter: 274702  Could be: 274th day of 1997 2nd shift
Carton Date: 9-97   Code on filter: 349702  Could be: 349th day of 1997 2nd shift
Carton date: 8-01   Code on filter: 111J2  No idea what this means but believe they were made by a different manufacturer because the round emboss on the shell is smaller than the original filter
 
I also believe the 1969 Camaro from the factory had an emboss message on the end of the shell that was removed later.
To complicate things further, a version of the PF-25 was produced in Canada that had different silkscreening.
 
I would like to see pictures or a description of the filter in question.
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william
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« Reply #3 on: December 20, 2010, 12:03:38 PM »

Check out:

www.1970z28camaro.com

This is an 1,100 mile car that never had an oil change. Original PF-25 is white with black silk screen, embossed on end.
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paceme
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« Reply #4 on: December 20, 2010, 03:31:20 PM »

Check out:

www.1970z28camaro.com

This is an 1,100 mile car that never had an oil change. Original PF-25 is white with black silk screen, embossed on end.

That is an example of an assembly line oil filter. They go for over $350 when they become available.
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Steve Shauger
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bowtie68iho
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« Reply #5 on: December 20, 2010, 09:22:30 PM »

JohnZ, per your request, attached are three photos of a NOS 1968 PF-29 oil filter with date code "CJ22" on the side.
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9T4Z
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« Reply #6 on: December 21, 2010, 08:53:32 AM »

Check out:

www.1970z28camaro.com

This is an 1,100 mile car that never had an oil change. Original PF-25 is white with black silk screen, embossed on end.

Not hi-jacking thread.... just that site gave me goose bumps. Never seen the white/black PF 25, but I do have a couple of the embossed white/blue in my parts bin.
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Gary 9T4Z

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rich69rs
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« Reply #7 on: December 22, 2010, 04:11:05 PM »

I understand the concours aspect of this, but why would you ever want to put a 40+ year old oil filter on your fine ride?  The elements do/will deteroriate with time.
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Richard Thomas
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bowtie68iho
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« Reply #8 on: December 22, 2010, 11:01:12 PM »

Attached is another NOS PF-29 oil filter (6437946), but a different can design than the previous one I posted.  I don't have the date code data on this one.

From what I read about the PF-29 oil filter in the Camaro Master Parts Manuals, it was the original factory oil filter for 1968 Camaros with V8 engines.  The PF-25 oil filter (6438261) superseded the PF-29 filter and was available at least through 1973, if not later (one of my two Master Parts Manuals ends in July 1969, the other one ends in 1973).
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bowtie68iho
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« Reply #9 on: December 22, 2010, 11:16:34 PM »

My theory on the date code is that the model year was used, not the calendar year.  I arrived at this conclusion because the carton for the PF-29 oil filter only listed 1968 V8 engines...no other years.  Assuming that the 1968 model year began in August 1967, here's how I decode "CJ22" on the filter:

"C" = Chevrolet.
"J" = April 1968 (if Letter "I" was skipped) or May 1968 (if Letter "I" was not skipped).
"22" = 22nd day of month.

I can't explain the two different PF-29 filters, though.  Maybe one was a Canadian version?
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JohnZ
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« Reply #10 on: December 23, 2010, 11:24:31 AM »

Here's Don's response to the PF-29 photos:

"I have two PF-29's in original AC boxes as follows:
 
Carton Date           Code on filter
8- 67                     N H 22
5- 68                     H J 22

I have no idea what the code represents.  N is the 14th letter ( or 13th if the I is not used)so it can't represent a month.  In all my years at AC I don't recall
using a silkscreen for date coding  a  product."
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bowtie68iho
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« Reply #11 on: December 23, 2010, 12:11:38 PM »

I'll be home in a day or so and I'll check the carton date on my filter and then post it.  If enough people post their carton dates and PF-29 filter codes maybe we can crack the code.
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Charley
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« Reply #12 on: December 24, 2010, 01:28:05 AM »

My 1100 mile 70 Z28 still had it's orig oil filter and it is white with black lettering, no blue on it. Absolutely the orig filter that was never off the car till I took it off.
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Charley
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« Reply #13 on: December 24, 2010, 01:29:16 AM »

more
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Charley
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« Reply #14 on: December 24, 2010, 08:17:16 PM »

JohnZ...Can you ask Don about mine ?
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