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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 05-01-2016, 11:49 AM
stranger12 stranger12 is offline
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Location: UK
 
Join Date: Jul 2011
Posts: 86
Mein Auto: 328i
e36 rear sub frame

Hi all,

I took my rear subframe out and restored /painted it.

Changed all of the bushes to poly bush but when putting it back up, I made a mistake and striped/damaged the head of one of the bolt holding the frame to the body . This also damaged the thread.

if we say it had 30 threads then roughly 8-9 threads at the beginning of the hole were damaged not striped.

so got a new bolt and tighten it which was very hard but went all the way.

would that be safe ?

i torqued it to 110nm.

i guess the new bolt head somehow has to adapt to the old thread . can it cause more harm to the other threads further up ?

it was either that or helicoil and don't think helicoil will be a good option at all
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  #2  
Old 05-01-2016, 12:17 PM
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hornhospital hornhospital is offline
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Location: In the Grumpy Chair
 
Join Date: Jan 2008
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Mein Auto: E24x2,E36x2,E30x1, F150
If it actually pulled up fully and torqued to 110nm, it's fine. It would have been a much better option to run a tap in the hole to clean up the threads before you cranked a new bolt in there. The new bolt and the threads in the hole are now galled together, and it'll be a nightmare to get it out.
The BEST option actually would have been a Helicoil. They are stronger than the original thread.
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  #3  
Old 05-01-2016, 01:21 PM
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Daggerty Daggerty is offline
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Location: Wisconsin
 
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Mein Auto: 1995 BMW 325is
As long as the tip of the bolt was damaged and not where the nut is holding it on torqued down.
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