really need help on this guys and thank you


my simple question is, can any leaf springs of the same lenght of a 1986 daihatsu rocky be fited?
that way i have a much wider form arch and at the same time gain some lift, please i would like to know everything about replacing or restoring leaf springs

Leaf Springs

Do you really want to know everything about leaf springs, it will take years of learning.

Leaf springs are manufactured from different material sizes with different characteristics, so altering these will mean either a very hard ride with no suspension movement, or a very soft ride with the vehicle liable to give you seasickness.
Hardening and tempering processes alter these characteristics to a degree, giving a harder of softer springing level, this is why other springs cannot be fitted if you want to maintain the ride and wear characteristics.

Restoring or even manufacturing leaf springs is possible if you have the right material in the right size available, and the correct hardness and temperence specifications. You will then need an oven to heat the entire spring uniformly, and a bosch to harden them, in addition you will need considerable experience of the hardening and tempering processes to harden and temper correctly. Over hardening will mean the spring snaps as you hit your first bump, under hardening means your vehicle will ride as though the springs are made of jelly.

This is the simplified and very abreviated version.

leaf springs

I am just talking about take them out, clean, sand, paint and put them back with new rubber bushes. that's just enough right???

Leaf Springs!!

2003 Sirion SL 1300. And I love it.
Don't like the new shape much.

Criky Assasin what a reply !! WOW.

vievegene 12. I presume you mean "SANDBLASTED"

That will clean em up better than normal sanding.

Also - Do not put back normal Rubber Bushes!

There are new ones available which are much better and last longer.
I can't remember what material they are made out of - But I'm sure someone on here will jump on this answer and tell you.

Regards, BobF.

2003 Sirion Rally 4. And I love it.
Don't like the new shape Sirion much.Sorry.



This is simply an overview, it is a complex subject; as for the bushes they are polyurethane or poly bushes.

Do not sandblast or shotblast leaf springs, this causes surface deformation and hardening, this causes the leaves to crack. Use a wire brush on an angle grinder or a drill, this will remove the rust without damage. Oil the leaves with engine oil, periodically go round them and keep them lubricated with old engine oil when you do an oil change. This will prevent many problems, and as poly bushes are impervious to oil it will not affect them unlike rubber bushes.

Leaf Springs!

2003 Sirion SL 1300. And I love it.
Don't like the new shape much.

Poly Bushes !!

Thanks for that.
I wasn't being funny when I replied before. I thought your overview was superb.

I didn't know about the shotblasting - I do now !!

I remember my dad (Long gone now) Using the old engine oil to do the bottom of his car and inside the wings etc.

I wonder how much good it actually did Unknw

But I can see the benefits for leaf springs.

You learn something everyday.

Cheers, BobF.

2003 Sirion Rally 4. And I love it.
Don't like the new shape Sirion much.Sorry.

Well Oiled

Bob: and they say recycling is new, they now even have oil tanks for us to recycle oil.

Leaf springs often come with very thin wear or friction pads installed between the leaves to stop them wearing each other out as they move, but these soon wear out on 4X4's, or are often displaced by the considerable movement of 4x4 suspension.

Dust getting between the leaves soaks up the oil, this effectively forms a grease, grease is simply oil absoebed into a dry porous medium such as talcum powder and mixed to a smooth consistency. Such grease like substances help seal out dirt and moisture between the leaves as well as lubricating them. Although it is a dirty job it increases spring life considerably.

Shotblasting uses many mediums for differing things, most use metallic based sunstances or harder sunstances such as carborundum, these exit at such high speeds that they actually dent the surface of the hardened spring, mediums exit at speeds in excess of 1000MPH. Such force dents the surface of the spring, denting hardened metals such as springs millions of times per square inch causes surface cracks, as the spring works these elongate and eventually join up, thus causing the spring to snap, although impossible to see, it is good to see them under an electron microscope.