69 L-71 alternator fan

[G A.]

Have been in search of a production line correct alternator fan for my L-71. Can anyone verify if the fan in this picture is the one I'm after? The TIM is somewhat vague, but seems to point to a fan such as this one. Other examples I have seen on cars look nothing like this. They vary along the 10 to 11 blade models with the non-symetric blade style.

(PS. I have 'borrowed' this photo from another website because this is the first example I have found that might represent what the TIM references)

[Edward J.]

Re: 69 L-71 alternator fan

Dan, that fan appears to be a 63 only fan. they have 13 fins and have a slight curveon the tip.

[G A.]

Re: 69 L-71 alternator fan

Edward,

Not doubting your judgement. To expand further, the 3rd edition of the '69 TIM&JG says that if the pulley and fan are separate components, which is true of L-71 alternators, then the fan has a single stiffening grove per blade. The picture I reference is the only one I have thus far been able to find of such a fan.

[Edward J.]

Re: 69 L-71 alternator fan

Dan, maybe Joe L. will chime in he has a 69, I could be wrong.

[Wayne M.]

Re: 69 L-71 alternator fan

...the 3rd edition of the '69 TIM&JG says that if the pulley and fan are separate components, which is true of L-71 alternators, then the fan has a single stiffening grove per blade. The picture I reference is the only one I have thus far been able to find of such a fan.

Dan -- I really shouldn't stick my neck into things '69, but here's 2 fans that fall under your description. There are 11 blades of unequal size; the only difference I see is that at the "crotch" between adjoining blades on the right fan, there's a circular feature. My guess is that one is an earlier version of the other.

[G A.]

Re: 69 L-71 alternator fan

Oh wow! Thanks Wayne. I know I should have have asked this question sooner on this forum. Sometimes though I hate to be a bother, I feel like I can/should be able to find the answer myself. Maybe you've done it??!! I hope someone can confirm your post.
- Dan

[Grant W.]

Re: 69 L-71 alternator fan

Hi Wayne
Hope all is well and we finally had about 5 inches of snow. Used my snow blower on the weekend and did the whole neighborhood, now it rained and most of the snow is gone.

Anyways getting back to the fan blades.

The black one to the right in Wayne's posting "single stiffening groove per blade" is correct for 68 and early 69 alts having a date code of 68 J K L or M using the 882 884 and 825
Also as Wayne described the round crotched area that is correct for the 68 and early 69 alt.

"2 stiffening groove per Blade" is correct for 69 dates using 882 884 and 825 This is the pic of the black one to the right in my post.

This picture is a FYI "2 stiffening grove per Blade is also correct for 69 alts using 859 and 883 as per my finger pointing to the extra curved hook.

So Dan you need the one with the 2 stiffening groove per blade as in my picture to the right. I remembered this as I was restoring my late 69 L71 20 years ago. So now you have refreshed my memory. I thought I had forgotten about it.
Hope this helps.
Grant

[G A.]

Re: 69 L-71 alternator fan

Thanks Grant! You have an email!!
- Dan

[D S.]

Re: 69 L-71 alternator fan

Hi Wayne
Hope all is well and we finally had about 5 inches of snow. Used my snow blower on the weekend and did the whole neighborhood, now it rained and most of the snow is gone.

Anyways getting back to the fan blades.

The black one to the right in Wayne's posting "single stiffening groove per blade" is correct for 68 and early 69 alts having a date code of 68 J K L or M using the 882 884 and 825
Also as Wayne described the round crotched area that is correct for the 68 and early 69 alt.

"2 stiffening groove per Blade" is correct for 69 dates using 882 884 and 825 This is the pic of the black one to the right in my post.

This picture is a FYI "2 stiffening grove per Blade is also correct for 69 alts using 859 and 883 as per my finger pointing to the extra curved hook.

So Dan you need the one with the 2 stiffening groove per blade as in my picture to the right. I remembered this as I was restoring my late 69 L71 20 years ago. So now you have refreshed my memory. I thought I had forgotten about it.
Hope this helps.
Grant

Grant, the alternator fan example in the right-side photo you provided is correct for 1970 1100884 alternators, too? I hope so as my 884 fan looks like exactly like it but unpainted.

Thanks,
Scott Sims
Texas Chapter

[David L.]

Re: 69 L-71 alternator fan

"2 stiffening groove per Blade" is correct for 69 dates using 882 884 and 825 This is the pic of the black one to the right in my post.

This picture is a FYI "2 stiffening grove per Blade is also correct for 69 alts using 859 and 883 as per my finger pointing to the extra curved hook.

Grant

Grant,

I believe the fan (painted black) in your photo to the right is GM # 1969448. The fan shown on the alternator in your photo to the right is GM # 1966990.

According to Chevrolet Parts History GM # 1969448 was replaced with GM # 1966990 in May 1969. Who know when the change was made on the assembly line.

GM # 1966990 was then replaced with GM # 800594 in June 1971 as per CPH.

For photos of the 1966990 and 800594 fans (by Flowjoe) see thread entitled "Alternator Fan" that was recently started on 02/03/2011. I believe that I also have these 3 different fans in my collection, 2 of them are NOS.

Dave

[David L.]

Re: 69 L-71 alternator fan

Wayne,

I believe that your two 11-blade fans are GM # 3843346 made by 2 different manufactures. I have several in my collection from alternators dated 1964-1966. I believe that they were used on 1967-1969 Corvettes as well according the the 67-69 AIM's.

Dave

[David L.]

Re: 69 L-71 alternator fan

Your fan is GM # 1940994 and was used on 1958-1963 Chevrolets, etc.

Dave

[Grant W.]

Re: 69 L-71 alternator fan

Grant, the alternator fan example in the right-side photo you provided is correct for 1970 1100884 alternators, too? I hope so as my 884 fan looks like exactly like it but unpainted.

Thanks,
Scott Sims
Texas Chapter

Hi Scott
The fan blade you have as described should be the same for the 70 884 alt.

I think in 71 they started to change to possible a 3 grooved. I'm not 100% sure but when I dig up the original alt from my 71 454 then I will know. Till then it will be a few years before the alt goes back on.
Hope this helps.
Grant