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Old 2 Weeks Ago   #1
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Leaf Springs

This thread will cover our task to restore our 4x4 leaf springs. They were running flat so we removed them after the recent peakender trip. Our first job was to identify the original distance between eyes. I measured the distance from the front chassis mounting to the rear shackle (with a slight backward angle). This dimension corresponded exactly to the leaf spring (in a relaxed state out of the car). So it seems the shape/geometry is correct, they just don't have much springiness.

We took the springs to a blacksmith. He said the smaller leafs should touch the larger leafs. With ours, you can see a small gap which indicates the springs are running flat. He will be doing a cold reset next week. A hot reset involves heating to a temperature (about 800 degrees), quenching in oil, then a re-heat (I cannot recall the temperature but its a lot lower). However, he is unaware of the composition of the steel so he is unable to use this method. He said cheap modern spring steel can only be heat treated once, and then you discard. If he were to attempt this method, it is probable that the springs will either go floppy or brittle.

So a cold reset involves dismantling the leaf then re-shaping them, which I understand is bending it so they come up a bit shorter, which will sewttle to an improved position when under load. We will try this first. Next option will be to replace the second largest leaf with a heavier guage. As a fallback option, I will be recording the dimensions and price up the manufactue of new springs.
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Old 2 Weeks Ago   #2
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Re: Leaf Springs

Had this exact process done to Brian's springs

Will definitely make the ride better when fully loaded with all of your Pandraid gear.

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Old 2 Weeks Ago   #3
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Re: Leaf Springs

Ok. Boys now your getting into it. Proper tech stuff
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Old 2 Weeks Ago   #4
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Re: Leaf Springs

Wonder if its worth doing this to mine. I was looking at the new ones on ebay but seemed overly expensive when mine still function ok.
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Old 2 Weeks Ago   #5
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Re: Leaf Springs

Quote Originally Posted by Freebo View Post
Wonder if its worth doing this to mine. I was looking at the new ones on ebay but seemed overly expensive when mine still function ok.
I will update this post once I have received the springs back and tested on the car. I am being charged 30 per spring for the reset. I will update the post with contact details if it goes well.
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Old 2 Weeks Ago   #6
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Re: Leaf Springs

All interesting stuff, there is a lot to be said for raising the ride height by just putting the suspension back to as new condition!

I had new middle leaves fitted to Digger's springs as they were broken, obviously not tried them properly and the back end is totally stripped but it sits much higher than standard, I forget the measurement. It will be interesting to see how it is when fully built up.

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Old 2 Weeks Ago   #7
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Leaf Springs

Quote Originally Posted by Freebo View Post
Wonder if its worth doing this to mine. I was looking at the new ones on ebay but seemed overly expensive when mine still function ok.

You can get ride hight assisting coil springs from Italy that bolt to the rear axel either side of the diffClick image for larger version

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