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Thread: S 111 SWB choppy ride - parabolics?

  1. #1
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    S 111 SWB choppy ride - parabolics?

    Hi, My mate's recently acquired 79 SWB "Toby" (now unregistered & settling into life on the farm Mudgee/Rylstone way) has disappointed him in respect of the ride quality.
    It 's running wide ish Sunraysia wheels with 31.0 X 10.5 R15 tyres.
    I recommended he go back to standard wheels and tyres and seriously consider converting the springs to parabolics as I've heard that transforms the ride. Wondering if anyone has done this & the outcome, costs and could his local reasonably competent mechanic do the job at the farm if he sourced the parts (and from where)?
    He has just tried dropping the tyre pressures and his "feedback" on that is below - note also his comments/queries re the state of existing springs. cheers for any words of wisdom on this one! Epsom.

    I have taken down the pressure of Toby's tyres from 40 to 35 and then 35 to 28PSI. It definitely makes a difference but makes a 50mm stump a dangerous leaping platform at anything around walking speed.

    My underside inspection might have revealed the problem? The leaf springs are frozen in a solid mass from rust. They look a bit beyond a Penetrene rust release, to me.

    What costs are likely with people's choice to change to 'elliptical' (parabolic) leaf springs for a softer ride? The drawing of elliptical leaf springs looks the same as standard as fitted, to me. What subtleties am I missing? Has anyone true good news to report on the fitting of 'elipticals'?

  2. #2
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    Rocky Mountain parabolics have a good reputation but are expensive.

    As long as the springs haven't disintegrated or broken, they may be saveable by stripping the stack and cleaning them with molasses, or sanding with an angle grinder and then grinding off the wear-steps on each leaf.

    Do a search in the S3 forum using "Parabolic springs" as the search term and you will find info on both options,

    Cheers Charlie

  3. #3
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
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    I agree with Chazza - first thing would be to see if the springs can be salvaged. Remove, disassemble, clean, paint, lubricate and reassemble - you would probably be astounded by the difference.

    John
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  4. #4
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    Just a question but might be relevent what sort of ride is he expecting from a swb series landy half a ton of wood in the back also makes for a much better ride

  5. #5
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    Quote Originally Posted by JDNSW View Post
    I agree with Chazza - first thing would be to see if the springs can be salvaged. Remove, disassemble, clean, paint, lubricate and reassemble - you would probably be astounded by the difference.

    John
    ^ x2

    I fitted new springs to a LWB Series III once and the ride was shocking. However, after greasing between the leaves the transformation was staggering, resulting in the best riding leaf sprung Landy I have owned.
    Roger


  6. #6
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    He finds his Series 11A 109 ute almost limousine like by comparison...not to mention his 130 HCPU "town car!"

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    ^ -----


    Cheers.

  8. #8
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    my swb springs were rusted into a solid block but hadn't deformed, i just jacked the chassis up so there was almost no weight on the springs which allowed the leaves to relax and open in places slightly...

    i then wire brushed them as best as possible and washed them with diesel, used that to soak into the rust ..

    i then used a high pressure oil can (the type that you squirt with your thumb) and used capillary action to draw waste oil in between the leaves, i threw a couple of cwt into the tub and drove it around for a few days, worked the suspension hard to break up the rest of the rust ....

    washed the leaves down again and more wire brushing and re-oiled them, i repeated this exercise for about 4 weeks and it transformed the ride quality (it's never going to ride like a Rolls Royce) ....

    keep your springs oiled and don't waste your money on parabolics unless you want/need a greater ride height and more articulation/body roll ...

    to get a decent ride in my 88" now that i have fitted parabolics (no idea of the make as they were cheap and secondhand) i have to carry weight in the tub, empty and it's still choppy i only bought them because everyone said i really needed them (my landrover is my daily driver)

  9. #9
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    My father used to keep his caravan springs oiled and wrapped an old towel around them to keep the dirt out. It was high maintenance, but it worked.
    That was back when Aussie roads were only about 50% tarred. Might not help with your situation, but, the more, the merrier.


    Cheers.

  10. #10
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    i had British spring parabolics in my swb and they were great! but there expensive and my mates series one with cleaned up springs and a leaf or 3 ripped out has as much articulation and a very similar ride quality.
    so if you can strip them clean them and ditch a load leaf if hes not carrying stuff that would be the best option.

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