What purpose does the rear wheel bearing washer serve?
It is number '3' in the picture. The 5th gen Prelude doesn't have the washer like the 4th gen Prelude does. It almost seems like Honda just merged the washer and the nut together for the 5th gen. The washer does have a point in the center of it that fits along a groove on the spindle which I guess keeps the washer from being able to rotate around the spindle on the knuckle. I can't figure out any purpose for the washer other than to provide a spacer. So does anyone know what purpose this washer serves and would it be detrimental if it wasn't used?
Well I think it helps stop the nut #47 from being turned/loosened off. I wouldn't skip on that. Worst case your wheel falls off while driving. Maybe I'm wrong but I wouldn't take the chance unless your 100% sure.
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