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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Aug-13-2018, 01:10:42 AM   #1
M3_Pilot
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Default Popped Spot Weld

What's up everyone,

Washed and cleaned my car today. And my paranoia of racp problems seems to have become a reality whilst performing my checkup. My car already has tms plates installed so I figured the spot welds would be the Achilles heel. Honestly, I'm not too concerned as it's the first sign failure and I check it regularly. Here's the damage.





I'm ready to pull the trigger on a vincebar or cmp kit and do it myself. But I also wanna know if I could weld the crack?

Also can anyone confirm that this is a popped spot weld? Or is it an actual tear?

Thanks

Anthony
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Old Mon, Aug-13-2018, 01:21:55 AM   #2
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Default Re: Popped Spot Weld

That looks like a tear. You need to strip the soundproofing all around it to see how far the problem goes (including hairlines).
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Old Mon, Aug-13-2018, 01:27:12 AM   #3
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Default Re: Popped Spot Weld

Hmm, okay then. I'll strip more of it off. It was a big pain to cut off that little square which is why I didn't strip more earlier.
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Old Mon, Aug-13-2018, 01:52:25 AM   #4
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Default Re: Popped Spot Weld

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Originally Posted by M3_Pilot View Post
Hmm, okay then. I'll strip more of it off. It was a big pain to cut off that little square which is why I didn't strip more earlier.
Use a heat gun and metal scraper
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Old Mon, Aug-13-2018, 02:33:36 AM   #5
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Default Re: Popped Spot Weld

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Hmm, okay then. I'll strip more of it off. It was a big pain to cut off that little square which is why I didn't strip more earlier.
There is an art to removing it. Do NOT overheat the soundproofing layer. Just heat it enough to get a sharp putty knife under the edge and then heat only enough to try to lift it WHOLE - one width of the putty knife at a time.



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Old Mon, Aug-13-2018, 03:51:52 AM   #6
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Default Re: Popped Spot Weld

Awesome, thanks for your advice! I'll keep the thread updated. As of now, if the rest of the RACP checks out good then I'm going to stop drill this tear, weld it, and then install a VinceBar. Sounds like a good resolution no?
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Old Mon, Aug-13-2018, 05:56:56 AM   #7
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Default Re: Popped Spot Weld

You have any weird creaking or noise along with this?

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Old Mon, Aug-13-2018, 07:14:22 AM   #8
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Default Re: Popped Spot Weld

This is what it looks like when the damage gets more extensive:


Hopefully the top end reinforcement bars are the solution. It would suck if the load is transferred elsewhere and starts causing other problems.
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Old Mon, Aug-13-2018, 02:14:53 PM   #9
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Default Re: Popped Spot Weld

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Originally Posted by mrgizmo04 View Post
You have any weird creaking or noise along with this?

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No creaking or noises. I only discovered it because I pulled the trunk floor mat to take a quick look at the top side. I'm going to pull the rest of the sound proofing later today to see the extent of the damage.
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Old Mon, Aug-13-2018, 02:52:53 PM   #10
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Default Re: Popped Spot Weld

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Originally Posted by L0ADED View Post
This is what it looks like when the damage gets more extensive:

2005 BMW E46 M3 RACP / Subframe Failure - Separation and Cracks - YouTube

Hopefully the top end reinforcement bars are the solution. It would suck if the load is transferred elsewhere and starts causing other problems.
Wow, scary!
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Discussing Popped Spot Weld in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)