Wheel Bearing Castle Nut

[ScottyB]

whoa, weird. not to insult your intelligence, just trying to get a picture here, but this castle nut has no provisions for a cotter pin? that's weird if not.

if the hub was worn i'd imagine you'd just get janky alignment specs but not actually a bolt that wants to exit itself from the car.

for the bolt to loosen itself like that so often my first thought is that there is some kind of expansion/contraction happening that's extensive enough for the bolt to loosen itself even at high torque loads. is there anything else on that hub that would be pouring heat into the hub like a dragging pad?

that castle nut should bolt down on your axle shaft right? i wonder if there is also some kind of play in the shaft that is in turn adding clearance to the castle nut binding area and allowing enough movement that the bolt can back itself off. there has to be some kind of movement somewhere because i strongly doubt that nice new bearings are going to do that to you, and over tightening them is as bad as having them too loose.