68, 69, 70 "shark tooth" alternator fan 1969448

[David L.]

There were 2 alternator fans used in 1968, 1969, and possibly 1970 on certain Chevrolet models that used a separate fan & pulley on the alternator. For those who have the ORIGINAL alternator, alternator fan, and alternator pulley on their 1968, 1969, or 1970 Corvette I only have one question, which fan do you have, the 1966990 fan or the "shark tooth" 1969448 fan? Apparently there were noise complaints about cars using the 1969448 fan.

Dave

[John H.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

Dave -

My '69 Z/28 (February '69 build) has its original 837 alternator and 448 "shark-tooth" fan; the same one was also used on the L-78.

[David L.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

John,

According to Chevrolet Parts History the 1969448 fan was discontinued in May 1969 and replaced with the 1966990 fan but it appears that the 1969448 continued to be used on the assembly line even during the 1970 production. I have seen original 1970 Z28 alternators with the 1969448 fans as well as the 1966990 fans.

Dave

[Joe L.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

There were 2 alternator fans used in 1968, 1969, and possibly 1970 on certain Chevrolet models that used a separate fan & pulley on the alternator. For those who have the ORIGINAL alternator, alternator fan, and alternator pulley on their 1968, 1969, or 1970 Corvette I only have one question, which fan do you have, the 1966990 fan or the "shark tooth" 1969448 fan? Apparently there were noise complaints about cars using the 1969448 fan.

Dave

Dave-----


I have attached photos of the known-original fan from my September, 1969 built 1969 as well as photos of an NOS GM #1966990 in the following thread:

https://www.forums.ncrs.org/showthread.php?t=84196&uid=9177

[Warren F.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

Joe,

I found your information on alternator fans very interesting, so I went out and looked at both of my '71's. VIN 12659 has the shark tooth style and VIN 15065 does not. So do I have both 1966990 in two styles as you suggest in your other thread or one of each 1966990 and 1969448?

I am a bit confused after reading both threads.

[Joe L.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

Joe,

I found your information on alternator fans very interesting, so I went out and looked at both of my '71's. VIN 12659 has the shark tooth style and VIN 15065 does not. So do I have both 1966990 in two styles as you suggest in your other thread or one of each 1966990 and 1969448?

I am a bit confused after reading both threads.

Warren------

It's been my opinion for quite awhile that the GM #1966990 was made in both configurations, possibly as a result of a change made at some point to the specifications.

[David L.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

It's my opinion that the fan with the "shark tooth" is GM # 1969448 as per the Chevrolet Technical Service Bulletin dated Sept. 13, 1968.

Dave

[Warren F.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

About the only thing I can say is neither of my '71's, Mar 18 & Apr 20 trim tag dates has the 800594 style fan.

[Joe L.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

It's my opinion that the fan with the "shark tooth" is GM # 1969448 as per the Chevrolet Technical Service Bulletin dated Sept. 13, 1968.

Dave

Dave-----


All I can say is that the "shark-tooth" fan I have is in a box labelled 1966990 and I firmly believe it's what it was originally supplied in that box. Plus, the only difference between the 2 fans seems to be that "notch".

[Joe L.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

About the only thing I can say is neither of my '71's, Mar 18 & Apr 20 trim tag dates has the 800594 style fan.

Warren-----

I think it's very possible that the 1966990 was used in PRODUCTION well into the 1971 model year, if not beyond.

[David L.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

All I can say is that the "shark-tooth" fan I have is in a box labelled 1966990 and I firmly believe it's what it was originally supplied in that box. Plus, the only difference between the 2 fans seems to be that "notch".

Joe,

I found the photo of your NOS 1966990 alternator fan with the "shark tooth" in the "Alternator Fan" thread that was started Feb. 3, 2011, shown in the link below. Your post was on Feb. 5, 2011 @ 2:50 PM. I now believe that both fans are the same part number but were probably made by different vendors or at different factories or something like that.

I am back to "square one".

Does anyone have a photo of a NOS 1969448 alternator fan?

I also believe that there were 2 versions of the 800594 alternator fan (one with 10 blades and one with 11 blades) but I will start a different thread very soon.

Dave

https://www.forums.ncrs.org/showthread.php?t=84196&uid=5914

[Joe L.]

Re: 68, 69, 70 "shark tooth" alternator fan 1969448

Joe,

I found the photo of your NOS 1966990 alternator fan with the "shark tooth" in the "Alternator Fan" thread that was started Feb. 3, 2011, shown in the link below. Your post was on Feb. 5, 2011 @ 2:50 PM. I now believe that both fans are the same part number but were probably made by different vendors or at different factories or something like that.

I am back to "square one".

Does anyone have a photo of a NOS 1969448 alternator fan?

I also believe that there were 2 versions of the 800594 alternator fan (one with 10 blades and one with 11 blades) but I will start a different thread very soon.

Dave


https://www.forums.ncrs.org/showthre...84196&uid=5914

Dave-----


This is a real puzzler. I could understand a slight change in the 1966990 (i.e. the cut-out) being accomplished through a revision to the specs for that part number.

However, changes involving an almost total re-configuration of a part (i.e. the 800594) are virtually never accomplished this way; that usually rates a new part number. However, this appears it might just be one of those extremely rare cases in which a part number remains the same while the part is completely revised.