Cleaning up for paint and noticed a rivet missing. Looks like it was missing for awhile. The blade feels firm so run it, or figure a way to fix, or replace? I’m sure the factory didn’t leave it out for balance.
340 7-blade fan rivet missing
- Thread starter T-Man700
- Start date
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I would have it magnafluxed to check for cracks. You don't want it turning loose, it will cause a "lot" of damage. Ask me how I know.
No cracks that I can see, got it down to bare metal.
Ironracer
Gearhead
I would definitely follow the advice above.... or just replace it...
Dan the man
Well-Known Member
Replace it, it's cheap insurance. If the blade comes apart it will cause more damage than what a new blade will cost you. Having it magnafluxed is a waste of money unless you have a exact style rivet to install, anything else will throw the blade out of balance and probably cause water pump failure, belt breakage.
340six
Well-Known Member
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This I have seen wgat happens when they loose a blade. And also seen water pumps ruined from out of balance.
I grew up on the same street as. Dealership. I saw all kinds of new cars and crazy repairs. It was ( is a Chevy Dealer)
New name but still in Biz.
Sounds like replacing is the best, I probably knew that just wanted a few more thoughts. Thanks guys, not worth the worry.
If it were me I would machine a rivit on the lathe and fix it.
Dan the man
Well-Known Member
Not everyone has a lathe at their disposal
Ironracer
Gearhead
You just got to find the guy that was working on the assembly line in 1971. He has a pocket full of spare rivets out in his Workshop
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MOPAROFFICIAL
Oogliboogli
Idk.. leave it or weld it. Jmo
Source a new one and hang that one on the wall even..
Source a new one and hang that one on the wall even..
Ironracer
Gearhead
I hang all kinda Used up/ broken parts Hanging around.. just kinda a cool thing, I guess
Pretty scary. I’d fix it. I don’t think you have to worry about balance much that close to the center of rotation.
Wall art!!
340's usually came with a torque drive fan. Did you change it to the fixed unit? I am considering doing the same thing. What are your thoughts on it's cooling ability.
The factory did balance these fans. They did it by adding a flat washer and riveting it on.
Ironracer
Gearhead
Wow! That's pretty cool Man!
Never saw that.
IMHO, you could buy a steel rivet and have it properly swedged on.
Sky scrapers, bridges, ships, planes, and fan blades have had rivets in use for more than a century. The process is not particularly sophisticated.
THAT BEING SAID... for the money a replacement would bring piece of mind. You might even find one with a more agresdive pitch.
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pishta
I know I'm right....
replace all of them, balanced again!
Good point.
My bet is the manufacturer did not balance the fans.
The rivets would all be the same weight within a very small tolerance.
The blades the same and punched out of steel.
The center, punched out of steel.
Now maybe they weighed the blades and used 7 blades that were all within a specific weight range.
This H code Demon was a drag car when I got it and came with the fixed fan. I figured if it worked for him, I would just leave it. Since I'm replacing it now, I'm on the fence as well with the factory radiator.
213 fan? 68 340, didn’t have a clutch drive, direct drive.
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