Quote:
Originally Posted by Pparana
Its not the grit that causes them to separate it is load. They are sealed until the case splits. Once the case splits open, that's when you get more noise, worst case is failure. I would suspect this bearing is what caused the urethane failure. The load for the shock (strut) is minimal, the load on the spring is much greater.
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I'm not sure I agree with you on load.
My understanding: The strut bears all of the suspension's lateral load. The spring bears vertical loads.
When you have a lot of camber, the perch bearing is only subject to lateral load
relative to the strut caused by non-parallel perches. The perch bearing is not used for strut top location.
What I think causes the failure with urethane bushing: bending of the shank stud back and forth relative to the shank, leading to hardening and breakage. The spherical bearing fixes this by ensuring there's no bending load on the stud, only the normal lateral load for location of the top of the strut.