Hi Dave,
Thanks for the detailed reply.
My problem with the new bushes is that the metal sleeve was longer than
what was in there before and consequently would bottom out well
before the fulcrum bolt could be fully tightened (the nut would not go on
deep enough to expose the hole for the cotter pin) nor the cross bolt on
the
shock arms (there was still an air gap between the shock arms)
I did follow the manual instructions with the 2" spacer block and I've done
this assembly job before and everything went together properly. With the
new bushes
the task was impossible until I "corrected" the part length. I'm pretty sure
the current Moss parts are wrong.
Cheers,
John
Dave & M wrote:
> Hi John,
>
> The original bushings are intended to have the steel sleeves clamped
> solid before the rubber is clamped. The rubber bushing is a torsion
> spring, bonded to the sleeve & clamped into the arms, which is supposed
> to flex/twist as the suspension moves. There was not intended to be any
> rotating motion between the sleeve & the suspension arms or bolt. If
> there is any rotating motion, there is no way to lubricate the joint &
> premature wear will occur. If there is no grease fitting on a bushing it
> was never intended to rotate.
>
> The rubber torsion springs actually add a bit to the spring rates. This
> is why the shop manuals say to center the suspension travel before final
> bolt tightening. (The part about placing a block of wood between the
> upper arms & the shock tower). Also applies to the lower inner front
> bushings & rear spring bushings. Centering prevents destructive over
> rotation/flex of the rubber.
>
> To repeat, the sleeve should come up tight before the rubber is clamped
> to any great extent.
>
> Dave Russell
>
>
>
> John Loftus wrote:
> > When tying to install new trunnion bushes (rubber bushes with steel
> > sleeve positioned between the ends of the two shock arms) I was
> > running into great difficulty getting the shock arms to bottom in the
> > middle where the cross bolt fastens them together. I compared the
> > new bushes with the old and found the steel inner sleeve to be
> > appreciably longer on the new ones (approx. .95" compared with .875"
> > for the old). I ground the inner side of the new ones down to the
> > .875" length (with bench top belt sander) and everything fit together
> > properly. I plan to bring this to Moss' attention but curious if
> > others have run into this and to alert others who may face the same
> > problem.
> >
> > Cheers, John
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