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Ever re arc a leaf spring?

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Jerry

07-16-2003 07:18:16




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I have an older one ton chevy that the overloads are bent down. Was wondering if a guy could put them in a press and bend them back or is it mandatory that heat treating be performed? The local junkyard wont break up a set to sell me overloads only.




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mj

07-23-2003 14:37:49




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
Back in the '60s we were re-arching Jeep springs that had sagged or needed reset for a higher ride height. We tried putting the individual leaves between blocks on a press but they would either break or re-settle. We ended up using a piece of railroad iron with a 3/4 inch block welded to the face of the rail at one end. This provided an unsupported area for the spring as it was worked with a 2-3 pound ball-pein hammer. We used a lot of lighter blows as we worked the spring back and forth along the rail; stopping frequently to compare the new curve to a tracing of the old one on the shop floor. Our experience showed that it was easy to over-do the amount of arc as a leaf done this way tends not to resettle much. Once you're set up it doesn't take very long to re-set a spring this way. You WILL need a pair of shooters' ear-muffs for this! :-)

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Trevor

07-21-2003 12:25:16




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
Jerry,

You should be able to have a spring shop put two new ones in for about $150. There is 2 shops here in town that do only spring work, there must be some in your area. Go in and talk cash if you can and if you bring them the sprins out of the truck the price should go way down.

Just a thought.



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kjm

07-16-2003 21:07:53




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
Jerry,If you are near west central ILL there is a shop in Quincy IL that will re-arch them, He has a roller to do it. The last time I was there He charged me a 100.00 for 2 leafs and labor.( maybe 150.00)



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Jerry Thanks

07-16-2003 19:53:45




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
Thanks for all the comments. You all have convinced me to keep looking. I figured some of you guys had been there done that, so on the outside chance I could get away with it I had to ask. I did check the local chevy garage and they wanted 160 apiece (320 a pair)just for the one top overload. I thought that was too high for my old beater. well thanks again jerry



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Fritz Campbell

07-16-2003 19:11:33




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
I work Quality Assurance (25 years total now)for a major aftermarket suspension manufacturer and can assure you that any mechanical cold working to increase the arch of a leaf spring is a waste of time and money. The rearching will not hold and will slowly settle back to the original arch or will fail the leaf. Replacing the leaves in question is an option - you should be able to buy just the leaves you need or any decent spring shop can build you up some from repair plate. Buying new may not be as expensive as you think since you have a fairly popular vehicle and volume means less expensive manufacturing wise.

General rule of thumb is that every extra leaf added to a main spring pack will add an additional 1" of ride height. Single axle dumps with heavier beds might not see this much. Helper leaves (more or less straight leaves) won't add any height and shouldn't come into play until weight is added. They are called progressive rate leaf springs. Don't reuse your u-bolts either - get new ones - properly torqued u-bolts have slightly streched threads and won't torque up again correctly. I know there are lots of guys who do it - but for the cost its cheap insurance. If the center area of the leaf spring becomes active due to loose u-bolts, the leaves will fail at the centerhole.

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VaTom

07-16-2003 19:01:56




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
Hey Jerry,

I know almost nothing about springs but I moved a pile of them today. Bought at auction for $2, all new. I use them for table bases, self-leveling. Work great. My only interest is the long ones.

If you have dimensions I could see if there's a leaf you could use. These guys were from bigger trucks I think. Incredibly heavy.



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Jerry

07-16-2003 19:58:34




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 Re: Re: ever re arc a leaf spring? in reply to VaTom, 07-16-2003 19:01:56  
The shipping would probably be more than its worth but thanks for the offer. I am trying to picture springs as table bases you mentioned. could you explain a little more? Thanks jerry



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VaTom

07-17-2003 04:59:51




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 Re: Re: Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 19:58:34  
Hi Jerry,

You're right they're heavy, stop by if you like. I use two leaves (leafs?) to make a cross. The original one, outside here, has a 6' and a 3', welded at the midpoint. I've since been told you can't weld springs but as I didn't know better I went ahead and did it. I have no idea what machine uses a 6' leaf. The auction ones are much shorter.

These didn't all have the round end, hangers I guess, so I added short pipe lengths to get feet where needed (4" d.). On top of the cross is a "pedestal" made of a centerless steel wheel, unknown origin, that's 1/4" x 5" in cross-section and 2' d. Then you figure how to attach the top of choice.

Made one for us and then found it attracted a number of commissions for others. I'm a furniture maker, normally wood, so the dimensions came out well. Top of this one is oval 4' x 9' with tile mosaic.

Just playing with junk. The surprise to me was that the springs make the table self-leveling. It's heavy and all four feet are always in ground contact.

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Jerry

07-17-2003 06:54:53




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 Re: Re: Re: Re: ever re arc a leaf spring? in reply to VaTom, 07-17-2003 04:59:51  
Sounds interesting. For some reason I had the "classic" picnic table in my mind. A lot of nice stuff has been made from old junk but it takes a guy with a good imagination to come up with something good. So that lets me out;^)



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BillWV

07-16-2003 18:29:11




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
A local fellow that built custom 4x4 trucks used to re-arch leaf springs. His trucks were known for breaking springs. As one of the other posters said, he laid it on an anvil and pounded on it. Not a good idea.
Bill



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wdTom

07-16-2003 17:50:42




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
I have never done it, but I remember reading in a Hot Rod how to book about re-arking springs to get a lower or higher ride height. They showed them on an anvil being beat with a hammer. If you put the leaf flat on an anvil and beat it along the length the theroy (and practice I guess) was that you could change the curve.



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Red Dave

07-16-2003 11:12:43




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
I have had springs re-arched on a truck. Rear springs on an old IH firetruck.
Didn't try to do it myself though, had a pro do it, I didn't watch the process, so I don't know how it was done.
Was told that the best way was to add a leaf or two at the time of the re-arch job for longest lasting results. Did the job in '86, sold the truck in 2000, no problems yet when it was sold.



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Mac

07-16-2003 10:23:59




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
A few bucks upfront, but I would opt to replace.
Once broken over I wouldnt try to reform them by any means. I would think you could find a replacement at some truck repair place.



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GPWT

07-16-2003 09:39:50




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 Re: ever re arc a leaf spring? in reply to Jerry, 07-16-2003 07:18:16  
I have some experience with automotive leaf spring manufacturing, processing, and design, so I will add my 2 cents worth:
Automotive leaf springs go through an unbelievable number of manufacturing processes, and if any of these processes were not needed they wouldn't do them! Unless you can duplicate these processes you may end up creating a flaw in the spring that will fail at the worst possible time.
Decent replacement springs are cheaper than hospital or burial bills!

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