66 Power Steering Pump/ Date code

[Jim S.]

A while back I posted some pictures of two Power Steering Pumps And asked which one was correct for my year.One I took of my car and the other one I puchased as a "correct rebuilt" Naturally , Everyone who responded on this board picked this one .

Well after having it rebuilt, and powder blasted clean, I now see I could have chosen for my self , had I looked close enough. I have never heard of a date stamped into the Pump , and I admit that without a magnifying glass it is very hard to see . But here it is ,albeit difficult to make out : 21 B 6....

I am assuming it means February 21 1966.... No?

Just thought I would post for those who also did't know and for those who enjoy seeing these things .

Jim

[Peter J.]

Re: 66 Power Steering Pump/ Date code

Jim,
I got three or four from 65 and 66 Chevys out of the junk yards sometime back and I will and will clean the grease and dirt off and check for dates. Sure would help in identifying. Pete

[Jim S.]

Re: 66 Power Steering Pump/ Date code

The following scan is a 1967 Corvette P-pump #5698078. Note that the test date code location is called out the same as your pump. Your coding would appear to indicate January 21, B-shift, 1966. However, there seems to be some additional coding in terms of assembly station (L or R) that was omitted.

Note that there is also a alpha sticker "AG" on the fill neck for the 1967 pump. I don't know if the 1966 pump had an alpha sticker or what the letters were.

One other thing: The cap that is shown on the pump is plastic and is called out as 7803820. The drawing was updated with a different cap as revision Z on 4-8-68. The original cap was 5690846. So the original cap may have looked different (metal rather than plastic?) than the one shown.

If someone could supply the part numbers for the 1963, 64, 65, and 66 pumps, I will try and obtain the original drawings.

One last thing: Saginaw was very good at updating their service parts to reflect the latest designs (as long as they didn't affect serviceability.) So usually there is a revision trail in the revision boxes on the side or bottom of the assembly drawing. The real killer is when a drawing is "revised and redrawn". Then the revision trail is archived up to that point. Finding those prior archived drawings with the revision trail is becoming very difficult.

Jim

[Jim S.]

Re: 66 Power Steering Pump/ Date code

Jim,

Very interesting drawing!

I am suprised that The Judging Guide does not mention the date code, even if it is tough to see .That is why I posted the picture. I fiqured others were probably not aware of it either . It appears however from that drawing that they all have one though.

I am sure Joe Lucia will be able to give you the part #s for the years you requested. He might also know if and when they quit stamping them.

Jim

[Terry M.]

Re: 66 Power Steering Pump/ Date code

I know there was mention of the date code in the 1970-72 TIM&JG at one time -- it might still be there. Unfortunately we didn't know exactly where the date was. The parts book made reference to a date code, and that was the reason for the mention in the 1970-72 manual.

[Joe L.]

Re: 66 Power Steering Pump/ Date code

The following scan is a 1967 Corvette P-pump #5698078. Note that the test date code location is called out the same as your pump. Your coding would appear to indicate January 21, B-shift, 1966. However, there seems to be some additional coding in terms of assembly station (L or R) that was omitted.

Note that there is also a alpha sticker "AG" on the fill neck for the 1967 pump. I don't know if the 1966 pump had an alpha sticker or what the letters were.

One other thing: The cap that is shown on the pump is plastic and is called out as 7803820. The drawing was updated with a different cap as revision Z on 4-8-68. The original cap was 5690846. So the original cap may have looked different (metal rather than plastic?) than the one shown.

If someone could supply the part numbers for the 1963, 64, 65, and 66 pumps, I will try and obtain the original drawings.

One last thing: Saginaw was very good at updating their service parts to reflect the latest designs (as long as they didn't affect serviceability.) So usually there is a revision trail in the revision boxes on the side or bottom of the assembly drawing. The real killer is when a drawing is "revised and redrawn". Then the revision trail is archived up to that point. Finding those prior archived drawings with the revision trail is becoming very difficult.

Jim

Jim-----


The 63-69 power steering pump part numbers were as follows:

1963------GM #5691158 (also early 1964)

1964-------GM #5692842

1965-------GM #5693140 (all except L-79, L-78); GM #5696222 (L-79); GM #5696999 (L-78)

1966-------GM #5696222 (all except L-36, L-72); GM #5696999 (L-36, L-72)

1967-------GM #5698078

1968-------GM #5698078

1969-------GM #5698078 (early); GM #7808286 (late)


The GM #5690846 reservoir cap was metal. This cap has a "smooth" perimeter. The GM #7803820 cap was mostly plastic. This is the cap with the "serrated" perimeter. According to GM it was introduced sometime in the 1969 model year. However, I suppose it might have been introduced prior to that.

[Rick S.]

Re: 66 Power Steering Pump/ Date code

Jim,
I had my 1967 pump off last month for a rebuild and noticed some stamping on the side but was unable to read it, even using the magnifier from my picture softwear. I also found a larger stamping on the backside, which is C12.
Rick

[Rick S.]

Re: 66 Power Steering Pump/ Date code

Here is a picture of the "C12" stamping, it is at the 3 o'clock position.

[Jim S.]

Re: 66 Power Steering Pump/ Date code

Joe and Rick,

Thanks Joe ,
I knew you would have the #s .

Rick ,
I can relate to the" being hard to read' Deal. .
If it had not been blasted I would have never seen it , and even when I did, I needed A magnifying glass to make it out .

Even with a Magnifying Glass I could detect no stamping on the back side like yours had. Must be a "67" thing !

Jim

[Jim S.]

Re: 66 Power Steering Pump/ Date code

Saginaw manufactured some of their pump reservoirs and purchased others. That coding on the back side of the reservoir could have indicated the source or some internal manufacturing date.
Jim