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Lower control arm castle nut

144 Views 3 Replies 2 Participants Last post by  Frohst
My drivers side lower control arm castle nut has fallen off for the second time. Same exact way, fixed it yesterday and then today it fell off. No idea how. Anyone have an idea? Got the castle nut and cotter pin from autozone. Is it the lower ball joint maybe? Any help is appreciated.
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I mean. Torque to spec. Put a cotter pin in it. **** ain't going no where.

I don't see how your nut falls off if your cotter pin is in and of approximately the right size.
How I pin it:

Other ways of pinning:
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To be more specific if it helps, its the lower control arm meets the ball joint. The ball joint thread is stripped and so was the nut. The cotter pin fell out both times. Thank you for the reference though. Not sure why its falling out. I replaced the cotter pin on both sides, and only the pin on the driver side fell out.
If the thread is stripped such that the nut isn't grabbing and you aren't developing clamp load from torquing it then nothing you do will work short of getting a new ball joint. Can't recall if that's something doable diy or buy new knuckle/hub carrier and it comes with fresh ball joint.

And the cotter pin won't "fall out" if it's the right size and installed properly. The head is too big to go through the hole and you flare the legs out when you bend them so they won't go back through. Only way it comes out if it's the right size is you un bending the legs and pulling it out or the pin gets sheared by the nut and ends up in pieces.
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