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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Rear knuckle upper control arm thread damaged



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      06-13-2018, 08:10 PM   #1
drunkenup
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Rear knuckle upper control arm thread damaged

Trying to troubleshoot for a bent arm tonight I ended up crossthreading where the upper control arm connects. Inserted the bolt at a bad angle, wasn't paying attention, and started cranking away, almost immediately going tight.

Figuring I have nothing to lose I threw the bolt back in the bad side and it appears to thread in straight under force but didn't get far.

It does not appear the knuckle is threaded all the way through the other end of the hole, and I could not run a bolt through the opposite side (correct me if this is not really the case).

So, the threads are damaged at the first few turns, possibly less than a 1/4 of the way in, do I have any other options beside getting a new knuckle?
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      08-19-2024, 04:56 PM   #2
bubonicplague01
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Im having this same problem, did you ever find a solution other than a new knuckle?
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      Today, 05:43 AM   #3
streetpro
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Run the hole with a tap / thread tool (fine thread pitch, not regular), fix the thread on the bolt or put a new one. If it won't bolt to more than 4 functional turns, either put a helicoil insert or drill a hole through and put a self-locking nylon nut on the other side of the longer bolt.
Same thing happened to me, fixed with a tap, holds without problems for about 30k miles.
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