Re: [A/S] VINTAGE TECH QUESTION

--- In AirstreamList@yahoogroups.com, "Oliver Filippi" <ofilippi@...> wrote:
>
> Anne,
>
> The Airstream uses a unique rubber bushed torsion bar suspension where the
> rubber is contained inside the four corners of a square tube. (And a second
> square tube is inserted at a 45 degree angle) Yes, the rubber can
> deteriorate, which can only be remedied by replacing the axle assembly.
>
> The good news is that the axle has a much longer life than one would expect.
> Also, the replacement cost is not astronomical, but why replace it if it is
> still OK?
>
> Some dealers/service facilities seem to be over zealous in recommending
> replacing axles.
>
> The way the suspension works is by supporting the wheel on short "moment
> arm" attached to the axle torsion bar (inside square tube). The bar twists
> (compressing the rubber) and the wheel on the end of the arm goes up and
> down.
>
> If the rubber is shot, then the trailer will ride lower to the ground I do
> not know what the specified tollerance is. As long as the trailer has the
> proper ground clearance (the arm is at the proper angle - and height), you
> are fine.
>
> I would call the Airstream factory and find out what the specification is,
> and how to measure it. (It is just a simple measurement with a ruler or tape
> measure.) Then you will know the true condition of your axles.
>
> Good luck,
>
> Oliver Filippi


The ground measurement is not always a good way to check the axle. My 67 Safari was frozen at a high angle but there was no give left in the rubber.
The better way is to measure how much movement is left in the arm. Jack up the trailer and put it on a jack stand, then put a jack under the drum and see how far the drum will lift before the trailer lifts off the jack stand. 1" is usual for a dead axle 4 - 5" for a good axle, or ride in the trailer for a short distance. The ride will shake you up if the axle is dead and will be a smooth up and down if it's still got some life left. A 62 will be hard and shake the trailer apart!
Doug

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