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WTB date-coded alternator or front housing
Posted by: cnicol ()
Date: May 08, 2020 08:51AM

I'm looking for an alternator or front housing for my 1/31/66 production Sprint convertible.

The date would need to be 5Mxx (xx means last week or two of December) or 6Axx, early January.

Between myself, Cody, and Cody's Dad, we have a remarkable number (7 or 8) 4M alternators and one very early December '65, which at 2-months before assembly, is a bit early. One of those 4M alternators has 5M diodes in the back half-figure that one out.confused smiley

Anyone have a late December '65 or early January '66 alternator or front housing?

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: WTB date-coded alternator or front housing
Posted by: texas yenko dude ()
Date: May 08, 2020 09:07AM

Craig,

I will look and see what I have. I have quite a few 47 amp units. Which was an option...

Texas YENKO Dude
YS-070
YS-199
YS-320
Southeast of Disorder


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Re: WTB date-coded alternator or front housing
Posted by: azdave ()
Date: May 08, 2020 09:28AM

Checking...Pretty much all I do is 65-66 models and I have 8-10 alternators around here (somewhere).

Dave W. / Gilbert Arizona
65 Corsa 140/4
66 Corsa 140/4
66 Corsa 140/4 w/factory A/C
66 Corsa 455 Toro V8
65 Monza Convertible 110/4
66 Monza Convertible 140/4 A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5



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Re: WTB date-coded alternator or front housing
Posted by: cnicol ()
Date: May 08, 2020 09:35AM

Thanks for checking, Dave!

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: WTB date-coded alternator or front housing
Posted by: junkman ()
Date: May 08, 2020 09:36AM

Alternator housings were stamped with the numbers prior to assembly, and it is very likely that they were all done in batches. Having diodes installed after the date of the stamping is because the housings were waiting for assembly. In the manufacturing process, they had a good idea of how many would be needed for production of cars long in advance. The 37 amp alternator would have been built by the thousands, and the lesser used 47 amp alternator, only built by the hundreds at a time. I would think that it would be fair to say that the 37 amp vs. the 47 amp was at least 20 to 1. From what I have learned from reading many of the Chevrolet non Corvair forums, 6 or even 8 weeks before the cars production date is within reason. You also have to figure into the equation, that engine was assembled and shipped to the assembly plant prior to the car coming down the line. I would use the engine production date as a guide rather than the cars assembly date, assuming that the engine was shipped with the alternator installed. What is the date on your starter, if it is original to the car?

---------------------------------------------------------------------------------------------------------------
Woodstock CT... Located on the Connecticut / Massachusetts border, approximately 6 miles from the center of Southbridge MA. About 45 minutes from Hartford CT. 1 1/2 hours West of Boston MA. Woodstock CT to Los Angeles CA 2,937.1 miles. 1 Mile as the crow flies to Big Bird's nest.

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Re: WTB date-coded alternator or front housing
Posted by: cnicol ()
Date: May 08, 2020 10:07AM

Thanks for checking, Chris!

Junkman: I didn't know about the alternators being built in batches. That might explain the proliferation of 4M units among my Corvair friends.

The engine is currently built with January 12 RB cases. Since building the engine (which has to come apart for other reasons), I've acquired a January 20 engine case.

The car was assembled on 1/31/66 so either RB case is plausible. I haven't checked the starter date but I doubt it's original.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: WTB date-coded alternator or front housing
Posted by: momach ()
Date: May 08, 2020 10:11AM

Checked 12 alternators here.
Here's a couple close.

Steve of the Wet side of Washington State

one too many cars,(maybe)

multiple Corvairs.
1962 Buick Skylark
1967 Datsun 2000 roadster

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Re: WTB date-coded alternator or front housing
Posted by: texas yenko dude ()
Date: May 08, 2020 10:15AM

I sent you a text and a message in messenger. but I have a 5M16 Craig. It’s a 37A too

Texas YENKO Dude
YS-070
YS-199
YS-320
Southeast of Disorder


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Re: WTB date-coded alternator or front housing
Posted by: cnicol ()
Date: May 08, 2020 10:52AM

Thanks for checking, guys.
5M16 is the best yet but still a month ahead of the engine and six weeks ahead of the car.

I wonder what the normal lead time for alternator date vs. engine assembly date? I'd expect it's one to three weeks but that's a guess. Anyone know or have an original example?

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: WTB date-coded alternator or front housing
Posted by: Phil Dally ()
Date: May 08, 2020 12:17PM

Gem which "The Stig" and I believe 100% original is as follows.

T1227RY suffix and 1100698 47A 5M8 12V NEG alternator.

The Protect To Plate delivery date is 1/31/1966.

Tell me where the starter date is please.

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Re: WTB date-coded alternator or front housing
Posted by: corvairsince70 ()
Date: May 08, 2020 12:27PM

What is the list of codes for the alternator and starter. I understand the year and week, but please list the month codes for each please.

Dennis
Nashville area

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Re: WTB date-coded alternator or front housing
Posted by: Phil Dally ()
Date: May 08, 2020 12:34PM

Unless there is another place to look the best I can do on Gem's build date is the trim tag...01B.

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Re: WTB date-coded alternator or front housing
Posted by: joelsplace ()
Date: May 08, 2020 12:40PM

I'm with Dennis here. I'm not following how the alternator date codes work.

Joel
Northlake, TX
5 Ultravans, 114 Corvairs and counting...

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Re: WTB date-coded alternator or front housing
Posted by: cnicol ()
Date: May 08, 2020 12:40PM

So GEM's engine was built on 12-27-65 and its alternator was built on 12-8-65, a difference of 19 days. That's great information, Phil! Thanks for taking the time to post it. smileys with beer

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: WTB date-coded alternator or front housing
Posted by: Phil Dally ()
Date: May 08, 2020 12:44PM

And it's a 47 amp...I will look for the starter number after my nap!!!

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Re: WTB date-coded alternator or front housing
Posted by: cnicol ()
Date: May 08, 2020 12:44PM

corvairsince70 Asked:
-------------------------------------------------------
> What is the list of codes for the alternator and starter. I understand the year and week, but please list the month codes for each please.

Craig Replies:

A=January
B=February
C=March
D=April
E=May
F=June
G=July
H=August
J=September
K=October
L=November
M=December

"I" is skipped.

5M3 = December 3, 1965, for example.


Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: WTB date-coded alternator or front housing
Posted by: Phil Dally ()
Date: May 08, 2020 12:50PM

I is skipped...who knew? I counted up your M earlier today and it didn't jive to December.

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Re: WTB date-coded alternator or front housing
Posted by: cnicol ()
Date: May 08, 2020 12:53PM

Phil Dally Wrote:
-------------------------------------------------------

Tell me where the starter date is please.

Craig replies:
Here you go! This from a current ebay ad.


Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

Attachments:
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Re: WTB date-coded alternator or front housing
Posted by: Phil Dally ()
Date: May 08, 2020 12:57PM

Should be able to see that with a mirror and flashlight.

Gem is still on the rack from my earlier heater issue.

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Re: WTB date-coded alternator or front housing
Posted by: joelsplace ()
Date: May 08, 2020 01:16PM

I went through a couple of dozen. No 5M or 6A so far. I found one with the part number and 37A but no date code. Six have nothing stamped on them at all and a couple were too light to read.
How would Christmas and New Year vacations affect the date?

Joel
Northlake, TX
5 Ultravans, 114 Corvairs and counting...

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