Topic: SMOG PUMP DATE CODE

[mustang6er]

Can anybody help me figure out the date codes on these smog pumps?
the one with a bunch of dots is stamped 02062 in the housing
the one with a small cluster of dots is stamped 23551 in the housing
Thanks

[J_Speegle]

Bottom one looks like it might be Jun 6th 65

Top one has allot of dots.

Should find another (stamped date) on the section that is machined off in a sort of half circle (one of the webs) on the exterior surface> side not the end

[mustang6er]

Heres a pic of the stampings, how to interpret them and how they correspond with the casting? thats the million dollar question. Thanks
Bob

[jwc66k]

Weren't smog pumps made by Delco, or some other GM division? If the pumps were made by a non-Ford supplied they might not be marked in a form we are accustomed to.
Jim

[J_Speegle]

Heres a pic of the stampings, how to interpret them and how they correspond with the casting? thats the million dollar question. Thanks
Bob

That pattern and sequence of numbers don't match what I've typically seen on an original - more commonly the year, month, day of month & shift pattern

Have a fair number of them at the shop - just haven't collected a bunch of pictures of them    One I'm putting on the Boss motor is a rebuilt so no telling where it originally came from and I didn't restamp it was I would if doing a full restoration - or find another one

[Engineer]

These air (smog) pumps were manufactured by Saganaw Steering Gear ..... at that time a division of GM (now Nexteer).

The pie date code on the casting is from the casting sub-supplier. The number in the center "65" does refer to 1965. The wedges around the perimeter number 12 .... for 12 months in the year. The supplier starts at a wedge in this case the top and worked counter clockwise. Each week or production run made in a month is recorded by creating a dot in the wedge using a drill point. So in this case, the tool was used for production in January through June. It was out of service in July and August. It then was again in production in September. I cannot accurately count the number of dots in the "September" wedge ..... so you would read this: Week or run (fill in blank based on number of dots), September, 1965.

The number 23551 are the last 5 digits of the Saginaw Steering Gear part number for the component they mark (not necessarily the final assembly part number).

The number sequence Jeff is showing is the typical date code ... the stamped in number.

This air pumps have been remanufactured for decades. The remanufacturers were not religious about matching date codes and components from cores.

Hope this helps!

Rick

[67gt390fb]

I think i found the answer for the date codes on 1966 and 1967 (early?)  smog pumps.  as in the pictures of third post, they have 5 digit numbers, stamped into a pad on  the side of the aluminum housing, which translate to:
DDDY#    DDD= julian calander day,       Y= year,        # = shift code  ?

I dug out a few smog pumps and found:   12471   which would be:  May 4 1967
                                                                  28461   which would be:  Oct  11 1966
                                                                  25061   which would be:  Sept 7 1966
                                                                  15771   which would be:  June 6 1967
                                 
                                 from third posting    02062        would be         Jan 20  1966
what do you think?

found clue on camero site here:
http://www.camaros.org/emissions.shtml

[J_Speegle]

I think i found the answer for the date codes on 1966 and 1967 (early?)  smog pumps..................
DDDY#    DDD= julian calander day,       Y= year,        # = shift code  ?

what do you think?

For the earlier cars and that version of dating the pumps we would have a better idea if we knew what cars each pump originally came from. IMHO that cross reference would add some credibility/assurance to the idea

Of course with a one digit year code (if the decoding is correct) a 7 could be 67, 77, or 87 since service replacements were made for a long time since these are emission parts and companies are suppose to keep them in stock for the longer amount of time. Sure there is a federal requirement in print somewhere 

[67_1183]

Here is a pic from my 1/26/67 SJ car.  I removed the smog system in October 1976, shortly after the first time I changed the spark plugs.

January 5, 1967 might work.

[67gtasanjose]

I think i found the answer for the date codes on 1966 and 1967 (early?)  smog pumps.  as in the pictures of third post, they have 5 digit numbers, stamped into a pad on  the side of the aluminum housing, which translate to:
DDDY#    DDD= julian calander day,       Y= year,        # = shift code  ?

I dug out a few smog pumps and found:   12471   which would be:  May 4 1967
                                                                  28461   which would be:  Oct  11 1966
                                                                  25061   which would be:  Sept 7 1966
                                                                  15771   which would be:  June 6 1967
                                 
                                 from third posting    02062        would be         Jan 20  1966
what do you think?

found clue on camero site here:
http://www.camaros.org/emissions.shtml

For the earlier cars and that version of dating the pumps we would have a better idea if we knew what cars each pump originally came from. IMHO that cross reference would add some credibility/assurance to the idea

Of course with a one digit year code (if the decoding is correct) a 7 could be 67, 77, or 87 since service replacements were made for a long time since these are emission parts and companies are suppose to keep them in stock for the longer amount of time. Sure there is a federal requirement in print somewhere 

To add to findings: I have a July 67 final assembly date 289 engine here with a July dated smog pump on it (using the Julian date suggestion) adding a little credence to the theory. I also have another pump with a late 65 date on it that was said to be removed from a 66 289 but no engine or vehicle date to add for more evidence.