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Old 10-16-2018, 10:34 AM   #1
kleedzine
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Front Reinforcement plate bolt missing at the front LCA bushing housing



Hi all,

I have had bad experience with a couple of shop. Last time one shop did put the wrong tranny oil and additives, moved to another shop, did whole both rear brake hard line (OE bmw steel line) replacement.

Over the last weekend, I DIYed, replacing both pre-cat O2 sensors...
I jacked, up the car, and was unscrewing those bolts on the front reinforcement plate, and noticed that one bolt is missing at the front Lower control arm bushing housing. And actually, it was stripped off.

At first, I could not believe that what kind of mechanic broke the bolt that involved structural rigidity on customer's car, and did not tell the customer.

Secondly,I could assume if he didn't break the bolt, at least he should have told me that it was missing. But I am quite positive it is NOT missing before him, because the car has been PPI done twice from two separate reputable BMW shops. Once for myself, and the second one was for a potential buyer.

I contacted the shop, the owner responded at first, but then don't reply FB messages at the moment. I am planning to call.

Anyways, sorry for the whining, and the story,
My real questions for you expert guys, is that would there be any structural damage or any chance of damage, if the bolt was missing for about 4 months, with normal street driving, sometimes hard turns at freeway ramp?

Any recommend to extract the bolt? Just regular bolt extractor should work?
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Old 10-17-2018, 12:37 PM   #2
jabela
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Shitty situation, but it may not be malicious. They may have over tightened the bolt, which then finally broke under the extra stress of driving.

At the least I would replace the one remaining bolt, and the bushing if it looks bent/damaged. Which it probably isn't if you're not driving hard like on a track.

Hopefully a regular bolt extractor will work. Keep us updated.
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Old 10-17-2018, 01:08 PM   #3
kleedzine
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Hopefully, it was not malicious.

Since he's not responding anymore, I am going to extract it this weekend myself.
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Old 10-22-2018, 10:27 AM   #4
kleedzine
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update...

Finally the shop contacted me, went there, he drilled out the broken piece, re tap the thread to fit the original size(I still don't understand how it maintain the original bolt size..because I saw all threads was drilled out and gone). He and I chatted, about the torque spec for the bolt, how it's broken, or etc. I didn't think he's knowledgeable about BMWs. I need better luck to find nice local BMW specialist.
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2009 Subaru WRX - SOLD
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Old 10-22-2018, 10:40 AM   #5
jabela
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Quote:
Originally Posted by kleedzine View Post
update...

Finally the shop contacted me, went there, he drilled out the broken piece, re tap the thread to fit the original size(I still don't understand how it maintain the original bolt size..because I saw all threads was drilled out and gone). He and I chatted, about the torque spec for the bolt, how it's broken, or etc. I didn't think he's knowledgeable about BMWs. I need better luck to find nice local BMW specialist.
Woah... he drilled it out and ruined the threads on the body? wtf? I would've thought he would reverse tap the bolt and unscrewed it.

If he re-tapped the hole, did he use a helicoil?


https://www.youtube.com/watch?v=-_azEsNkA9Q
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Old 10-22-2018, 01:12 PM   #6
kleedzine
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Thank you for the clip.

Yes, he tried to extract it with a extractor, and he failed, made the hole too big for the extractor, then drilled out the hole, and re tapped it, I am not sure if he used helicoil, but the original bolt went in, not sure how it would hold there for long term.

Fortunately, it was on the front bushing housing, not on the chassis. I am planning to upgrade the bushing next summer with the housing. Anyway, I will never go to the shop since he says those bolt don't have to be tightened to certain torque spec and he just proudly used battery powered 3/8" impact driver. Because I know that those bolts are not typical chassis bolts, and he really have NO idea about that.
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2009 Subaru WRX - SOLD
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Last edited by kleedzine; 10-22-2018 at 01:19 PM.
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Old 10-22-2018, 01:43 PM   #7
jabela
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Quote:
Originally Posted by kleedzine View Post
Thank you for the clip.

Yes, he tried to extract it with a extractor, and he failed, made the hole too big for the extractor, then drilled out the hole, and re tapped it, I am not sure if he used helicoil, but the original bolt went in, not sure how it would hold there for long term.

Fortunately, it was on the front bushing housing, not on the chassis. I am planning to upgrade the bushing next summer with the housing. Anyway, I will never go to the shop since he says those bolt don't have to be tightened to certain torque spec and he just proudly used battery powered 3/8" impact driver. Because I know that those bolts are not typical chassis bolts, and he really have NO idea about that.
Ugh... I hate when shops don't torque properly... then they wonder why bolts snap.
There are no threads in the front control arm bushing, only in the car body... actually maybe there are on M3's? To mount the subframe reinforcement?
My non-M doesn't have that bolt hole.
If that's the case then it's not as bad for you.

Here are the torque specs.
Torque for all 16 bolts are 59 NM ( 43 ft-lb ) You will need to torque two stages. 1st all at 43 ft-lb then repeat all at 90 degree + 30 degree.



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Old 10-22-2018, 02:32 PM   #8
kleedzine
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The one on M3s is shown on the second photo. Addition to the 2stage torque spec, it is single use bolt, by BMW TIS, to replace every time it's off.

http://www.m3forum.net/m3forum/showthread.php?t=400577
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