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Old 02-06-2020, 12:07 AM
Terry M. Hunt Terry M. Hunt is offline
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Default Strange alternator fan/pulley

After searching for some time, I finally located the correct alternator for my ‘65 GTO 1100729. 37 amp with a date code of 4J15. Started disassembling it tonight to do a rebuild. Not surprised that it appears to have been rebuilt at least once maybe more. I was surprised to find a one piece pulley/fan(see attached photo) instead of the usual separate fan and pulley. Never seen this before and I realize some previous rebuilder could have used whatever parts were available to result in a Frankenstein alternator. Is this the correct piece for this alternator? On a second question, I’ve always wondered why alternator pulleys and fans all seem to have. a slot made into them where they fit over the rotator shaft but the shaft has no key way machined into it. Any ideas on why this is so? Having problem posting two photos.

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Old 02-06-2020, 12:54 AM
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You probably have an early fan-pulley. 1963 alternators used them as well as generators before the alternators came into use. Generators use a key. These were a bit less in diameter from fan tip to tip than a later alternator fan. Don't toss it. It may have some value to someone needing a correct 1963 fan. Some had numbers stamped on them . Do a search on ebay. I think there may have been a corvette alternator that used it in 1963.

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Old 02-06-2020, 01:14 AM
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Here is an original 1963 alternator with the one piece fan-pulley. The alternator number is 1100628 and yes they were stamped in a different location on the alternator.
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Old 02-06-2020, 02:11 AM
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If you don’t mind what date is on your 65 firewall data plate.

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2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
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Old 02-06-2020, 11:20 PM
Terry M. Hunt Terry M. Hunt is offline
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Default Strange alternator fan/pulley

This car’s build date is 01A.

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Old 02-06-2020, 11:34 PM
Terry M. Hunt Terry M. Hunt is offline
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Default Strange alternator fan/pulley

There are no marks on this piece other than an upper case A with a circle around it on the face. Stellar, why do you think Delco kept putting the notches in the fans and pulleys apparently long after they stopped installing keys in the shafts these parts fit on?

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Old 02-07-2020, 12:18 AM
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Quote:
Originally Posted by Terry M. Hunt View Post
This car’s build date is 01A.
Thank you for that.

That’s a big gap in dates.
Alternator, 4J15 = Sept. 15, 1964
Build date, 01A = First week of 1965

Thanks again, Chris.

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2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
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Old 02-07-2020, 12:32 AM
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I don't know the answer to that one. My best guess would be to allow for them to be used on both shafts using a key way and ones not using keys as both would be in service for many years and replacement parts were needed. This would allow for one interchangeable replacement part vs two. I think it was mandated by law that manufacturers make parts available for 10 years after production. I think the fans retained the notch longer than the pulleys. I suspect this may have been because fans were damaged easier than the pulleys and more were needed. If they had a stamping machine to make them, I don't see why they would replace the stamps before they wore out if it wasn't necessary. So I would say money and the law is why. That's my story and I'm sticking to it until I hear a better one.

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Old 02-07-2020, 01:01 AM
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I don't think 3 1/2 months is at all a big gap especially when you take into consideration there was a strike that lasted about a month if I recall correctly. Sept or Oct of 1964. I would think the workers staged a bit of a slow down before the strike being they were a bit unhappy too. I wouldn't worry about the gap.

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Old 02-07-2020, 02:13 PM
Terry M. Hunt Terry M. Hunt is offline
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Default Strange alternator fan/pulley

When I was tracking down the alternator, I was only looking for one with a date prior to the car’s build date within some reasonable range. I figured 6-9 months would be too long but 3-4 months would be reasonable/logical. Besides, the Sept alternator date was all I could find for a reasonable price, so I’m okay with it. I have a spare separate fan and pulley I can use on it.

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Old 02-07-2020, 02:28 PM
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what is the number on the alt?

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Old 02-07-2020, 02:43 PM
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What caught my eye in this thread was the alternator “date code”.

Just so happens it’s exactly what mine is. 1100729 dated 4J15 = Sept. 15, 1964.

My alternator was Original to the car when I purchased it.
The entire car (11A) was assembled with Aug. Sept. of 64 components.

Later in 1965 the 37 amp alternator was 1100704.

The nation wide GM strike was Sept. 25 through Oct.25.

I feel certain my car had already been close to complete, but probably was held up with the final inspection because of this strike.

Chris.
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2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
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Old 02-07-2020, 06:56 PM
Terry M. Hunt Terry M. Hunt is offline
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Default Strange alternator fan/pulley

Chris, that is an amazing coincidence. Stellar, your theory about the notched fan and pulley makes sense.

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Old 02-07-2020, 07:11 PM
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Chris, check out these pulleys. An early and a later one. I don't know when the change was made. The early one has the key way and a ring around it. Both are # 7 pulleys. Can you tell me what the ink stamp is next to the 1100 stamp?
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Old 02-07-2020, 09:51 PM
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The two letter factory ink stamp on my 65 alternator is “TF”.

I enlarged my previous photo to see clearer the code. Pic 1

I have another 65 alternator #1100729 that also has the “TF” code. Pic 2

Chris.
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2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
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Old 02-07-2020, 11:08 PM
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Thank You Chris. Terry, if you want a correct fan, take a look at the pic Chris put up. It is a 13 blade fan. Sometimes called a half moon fan because of the cut out on the top outer part of each fin. Maybe Chris can show a pic for you or if not I will try to put up a pic of one of mine tomorrow. I think this fan was only used for a few years on the early alts.

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Old 02-07-2020, 11:12 PM
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Hi Chris.. Is the TF on your build sheet in the alt area??? I have seen QC before..

"Bill"!

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Old 02-07-2020, 11:58 PM
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Factory 65 alternator fan.
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2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
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Old 02-08-2020, 12:20 AM
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Quote:
Originally Posted by bill ryder View Post
Hi Chris.. Is the TF on your build sheet in the alt area??? I have seen QC before..

"Bill"!
Bill,

I’ve never pulled the front seats or been able to look under the carpet for the 1965 “Car Building Order”.

As of now I’m not sure this car has the CBO buried somewhere?
I’d love to find it someday.

The early 1965 #1100729 37A would have the “TF” code.
The later 1965 #1100704 37A would have the “XC” code.

Below is a sample from someone else’s 1965 “Car Building Order” which shows what you are asking about.
“TF” in the Alt. box.
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2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option.
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Old 02-08-2020, 10:22 AM
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Thanks Chris. That is what I was asking about. My mistake on typing the QC!! The XC I have seen before..

"Bill"!

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