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A colleague recently had the lower control arm bolt fail causing serious amounts of failure, but even after LCA replacement the new bolt started to loosen up. For the first event, he had been hearing a clicking sound but was not able to isolate it until the catastrophic failure at a track (reminder to everyone that even a detailed track inspection can miss something so caution is always advised). Thankfully he was alert and able to get off safely and eventually transported his car to be repaired. The LCA, rotor, etc. had to be replaced as the two were rubbing together creating melted aluminum shavings on the inside of the wheel. A few weeks later while he had experienced hitting an unfortunate pothole but the car seemed fine otherwise. This past weekend while out for a spirited drive he detected the same kind of problem he experienced at the track and was able to stop again safely. As it turns out he was again faced with the bolt now unscrewing itself causing the LCA to move around. Coincidence? It just doesn't seem right. The one other detail is that he installed the X73 himself 3 years prior to his first failure. It seems unlikely any X73 installation would have been the problem and waited 3 years to show itself. But I did not get to ask him if he had the alignment checked at the time. I was wondering if there is a way for a slightly off alignment - he is very attuned to his car - so something subtle that would allow for such a situation to occur. Thanks in advance.
 

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I'm not a tech but what about Loctite or drill and pinning it.
 

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you need to get an expert to look at the condition of the parts, other arms (including the diagonal one), suspension/absorber strut, alignment.

something that could loosen those bolts doesn't sound like a thread lock fixable issue.
 

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Did you consider it not being torqued properly ?
 

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Which bolt exactly? If it's the bolt that holds the LCA to the subframe (the bolt that the LCA hinges on), the nut should be replaced after a use or two. It's a deformed type lock nut.

Also as other said, was everything torqued to spec? If you over do one of these lock nuts they'll fail.
 
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