64 Alternator fan

[Ken J.]

Hello;
I am looking for a 64 Alternator fan for a 375 H.P. application. Can someone send me a picture of a correct fan for comparison. I have looked at the Judging Manual, but there is no picture. Let me know if you have one for sale.
Thanks in advance.
Ken Joseph 49012 E-Mail;;; kenjoseph@sunriseequipment.com

[Wayne M.]

Re: 64 Alternator fan

Hello;
I am looking for a 64 Alternator fan for a 375 H.P. application. Can someone send me a picture of a correct fan for comparison. I have looked at the Judging Manual, but there is no picture. Let me know if you have one for sale. ...

Ken -- I don't have a '64 TIM&JG for a verbal description, but here's what I would expect on an L84 (or any other '64 with separate fan). Seems to be two designs slightly different [one on right is off a '65 with the big pulley -- you can see the outline, paint runs (dipped ?)] and has a small circular cutout at each crotch of adjoining blades]. On the left is similar except for 'MR' stamping on one of the blades (no cutout at crotch). Both have a single radial rib and a single notch on the leading edge of each blade.

[Michael H.]

Re: 64 Alternator fan

Ken -- I don't have a '64 TIM&JG for a verbal description, but here's what I would expect on an L84 (or any other '64 with separate fan). Seems to be two designs slightly different [one on right is off a '65 with the big pulley -- you can see the outline, paint runs (dipped ?)] and has a small circular cutout at each crotch of adjoining blades]. On the left is similar except for 'MR' stamping on one of the blades (no cutout at crotch). Both have a single radial rib and a single notch on the leading edge of each blade.

Could the one on the left be from a 68 or 69? I see the fin placement is slightly different.

I remember a GM issued paper in late 68 that discussed an issue with "alternator moan" that was caused by the fan. A new part/number was issued for complaint cases.

I think the fan/part number is the same for 64-67?

[David L.]

Re: 64 Alternator fan

Michael,
Pictured is a NOS but "shelf worn" 3843346 11-blade alternator fan used from 1964 to 1969 as per my many vintage Chevrolet parts catalogs. It appears to be the same as the fan on the right in Wayne's photo. There are no stampings on it. The fans sold over the counter seem to be always painted black while the factory installed fans always seem to be natural metal. I used to have quite a few of these fans but most have been sold. There may have been two different manufacturers of the 3843346 fan or maybe a design change was made at the factory without a part number change.
Dave

[Michael H.]

Re: 64 Alternator fan

Michael,
Pictured is a NOS but "shelf worn" 3843346 11-blade alternator fan used from 1964 to 1969 as per my many vintage Chevrolet parts catalogs. It appears to be the same as the fan on the right in Wayne's photo. There are no stampings on it. The fans sold over the counter seem to be always painted black while the factory installed fans always seem to be natural metal. I used to have quite a few of these fans but most have been sold. There may have been two different manufacturers of the 3843346 fan or maybe a design change was made at the factory without a part number change.
Dave

I remember the note to dealers in the early part of the 1969 model year. I don't know if the fan part number changed in production at that time though. The replacement fan did have a different part number than the current production fan, and a slightly different configuration. The fans were to be changed on new 69's on a customer complaint basis.
It's very possible that the one on the left in Wayne's pic is the replacement as there is a difference in the fin angle and placement.

I think all the assy line fans for 64-67 were dipped in semi gloss black paint. (I don't know about 68-69) I believe those used for service were black also.
The NOS one in your picture looks just like one I sold several years ago.

I'll see if I still have the paperwork from GM on this but I doubt it.

[David L.]

Re: 64 Alternator fan

Michael,

The 3843346 fan (pictured in my previous post) was replaced with the 800594 fan in June 1971 as per Chevrolet Parts History.

The 1958-1963 13-blade fan, GM # 1940994, was replaced with GM # 1966990 in Sept. 1969 which was then replaced with GM # 800594 in Jan. 1971.

I have all 4 of these fans in my "collection".

Pictured below are from left to right:
58-63 13-blade GM # 1940994
70-71 11-blade GM # 1966990
NOS GM # 800594

Dave

[Michael H.]

Re: 64 Alternator fan

Michael,

The 3843346 fan (pictured in my previous post) was replaced with the 800594 fan in June 1971 as per Chevrolet Parts History.

The 1958-1963 13-blade fan, GM # 1940994, was replaced with GM # 1966990 in Sept. 1969 which was then replaced with GM # 800594 in Jan. 1971.

I have all 4 of these fans in my "collection".

Pictured below are from left to right:
58-63 13-blade GM # 1940994
70-71 11-blade GM # 1966990
NOS GM # 800594

Dave

My 1969 printing of the parts book shows the 3843346 for 64-69, and 800594 for 69 with H/Perf (350).

It might have been the 800594 that was involved in the "alternator moan" issue that I mentioned. That may have been the fan that was used to replace the 3843346 on a customer complaint basis in 1969.

I know almost nothing about 68 and newer.

[David L.]

Re: 64 Alternator fan

Michael,

You are correct about the 800594 being used on the 1969 Corvette w/H.P. 350 but no other 1969 Chevrolet models . I checked in all of my seven 1969 catalogs.

The following 1969 catalogs DO NOT list the 800594 fan in Gr. 2.274:

1969 Chevrolet Parts Catalog (Oct. 1968)
1969 Corvair-Chevy II-Chevelle-Camaro Parts Catalog (Oct. 1968)
1969 Chevrolet-Chevy II-Chevelle-Camaro Parts Catalog (Oct. 1969)
1969 Chevrolet-Chevelle-Nova-Camaro Parts Catalog (Feb. 1970)
1969 Chevrolet-Chevelle-Nova-Camaro Parts Catalog (April 1970)


The following 1969 catalogs DO list the 800594 fan but only for the 69 Corvette w/H/Per. (350):

1969 Corvette Parts Catalog (Sept. 1969)
1969 Chevrolet & Corvette Catalog (May 1969)

Dave

[Ray K.]

Re: 64 Alternator fan

I also remember that there was a service bulletin sometime in late 1968 or early 69 that some alternator fans produced a moan or whine and that a new design fan was distributed thru the parts system. As I recall, the fans blades had a substantially different appearance from the original, but I cannot verify the part number that was introduced at that time. Also, many fans that were available over the counter were natural and some were painted black. I suspect that more than one supplier provided these fans and had different finishes.

Ray

[Michael H.]

Re: 64 Alternator fan

I also remember that there was a service bulletin sometime in late 1968 or early 69 that some alternator fans produced a moan or whine and that a new design fan was distributed thru the parts system. As I recall, the fans blades had a substantially different appearance from the original, but I cannot verify the part number that was introduced at that time. Also, many fans that were available over the counter were natural and some were painted black. I suspect that more than one supplier provided these fans and had different finishes.

Ray

Thanks Ray.... For a while there, I thought I was going to be all alone on this.

[Wayne M.]

Re: 64 Alternator fan

X-rated alternator sounds .

June/July '64 Chevrolet Service News: Delcotron hum

Oct 26 '64 TSB: Delcotron Vibrational "Boom" on A/C Chevelles

Sept 13 '68 TSB: Delcotron Noise (Moan) on '68 Passenger equipped with V8 and Delcotron High Speed Fan #1969448, which was found to be dynamically unbalanced; noise detected in range of 2000 - 2600 RPM.

Replace with base fan # 1966990 to reduce noise to an acceptable level.

[Michael H.]

Re: 64 Alternator fan

X-rated alternator sounds .

June/July '64 Chevrolet Service News: Delcotron hum

Oct 26 '64 TSB: Delcotron Vibrational "Boom" on A/C Chevelles

Sept 13 '68 TSB: Delcotron Noise (Moan) on '68 Passenger equipped with V8 and Delcotron High Speed Fan #1969448, which was found to be dynamically unbalanced; noise detected in range of 2000 - 2600 RPM.

Replace with base fan # 1966990 to reduce noise to an acceptable level.

Thanks Wayne. I had at least part of the story right. It was late 1968, and it was a MOAN. And all this time, I thought it was my girlfriend making weird noises.

[Ray K.]

Re: 64 Alternator fan

Wayne

Thanks for the part number documentation.

Ray

[Doug L.]

Re: 64 Alternator fan

I don't have a photo of the fan alone but here are 3 showing the fan as mounted on the alternator of my '64 L-84
Doug

[Michael H.]

Re: 64 Alternator fan

I don't have a photo of the fan alone but here are 3 showing the fan as mounted on the alternator of my '64 L-84
Doug

Doug,

That looks exactly like the one on the right in Wayne's picture in post #1. I think that's the correct fan for 64-67.

(your alternator adjusting brace should be on the back of the ear on the alternator instead of the front)