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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, Apr-17-2017, 01:27:29 PM   #1
Lightship
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Default Subframe front mount point problem

Hey guys,

Anyone familiar with subframe/RACP issues know how this might occur?

I have had my RACP sorted, rear bar welded, Redish plates. So far it's been fine. Here is the rear mounts solution which, top and bottom, is so far intact.




I noticed this today at the front mount point, (drivers side US).



No welding work was done on the front mount points other than the Redish plates which are between the subframe and body.

Could the original welds inside the cavity have popped and/or the body torn away or has the rod un-threaded itself? Without cutting into the floor I have no idea what's caused this.

Appreciate your thoughts.

Cheers
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Old Mon, Apr-17-2017, 02:00:40 PM   #2
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Default Re: Subframe front mount point problem

You'll see once you get in there that the fronts are just as likely as the rear to tear away. Seach vinces thread or some posts he made and youll see the inside of that mount with a cut away from under the reat seats. Once you visualize the issue...youll see many ways to correct it. Personally a reinforced bolt through I think is the only way!


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Old Mon, Apr-17-2017, 02:08:21 PM   #3
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Default Re: Subframe front mount point problem

Thanks man.. I've been perusing those threads and looking at the pics. I'm still uncertain as to what may have happened with mine even after looking at those photos... or perhaps I just don't want to know!
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Old Mon, Apr-17-2017, 02:08:26 PM   #4
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Default Re: Subframe front mount point problem

love this car. hate these threads. look at the vince bar threads!

http://www.m3forum.net/m3forum/showthread.php?t=555302

and I'm sure he'll be popping his head in here soon.
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Old Mon, Apr-17-2017, 02:24:18 PM   #5
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Default Re: Subframe front mount point problem

If it were me I'd see if it backed out. Have you noticed any driveability issues? Why did you find it? Has anyone worked back there? Are you sure it was threaded fully when reinstalled?
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Old Mon, Apr-17-2017, 02:47:20 PM   #6
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Default Re: Subframe front mount point problem

Quote:
Originally Posted by PITT M3 RR View Post
If it were me I'd see if it backed out. Have you noticed any driveability issues? Why did you find it? Has anyone worked back there? Are you sure it was threaded fully when reinstalled?
Almost zero driveability issues. I've noticed some slight knocking noise which I solved today (slightly loose camber arm bolt). I was poking around and noticed that gap.

Last thing I did back there was install the diff front bush and above mentioned camber arms, but I didn't notice if that mount had dropped at the time. I don't know how long it's been like that!

Last guys to touch that mount were the guys that did the entire reinforcement job back in 2014.
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Old Mon, Apr-17-2017, 02:51:20 PM   #7
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Default Re: Subframe front mount point problem

It's backed out I'm almost certain of it. There would be major metal chunks if it had ripped fully. You probably have cracks there but i don't think it's ripped out.

I bet what happened was the bolt was torqued against a painted surface or onto seam sealer and sometimes when tightened against fresh paint the bolt isn't as tight was we think. The material under the bolts breaks down and bolts loses the purchase it had originally.

Get it tightened back up but while your there you should fix the broken welds which are inevitable imo and add a through bolt to the front mount.
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Old Mon, Apr-17-2017, 02:53:28 PM   #8
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Default Re: Subframe front mount point problem

Could have been that way all along then. I'd see if they cross threaded it or if you can back it out and or in slowly, smoothly.

Up at the plate, can you tell if there are engagement marks from torquing? If the plates were installed and coated then the bolt was threaded in and tightened all the way, there will be the scratches / marks from it touching and rotating. If they're not there, it was never tight.
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Old Mon, Apr-17-2017, 03:01:39 PM   #9
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Default Re: Subframe front mount point problem

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Originally Posted by schoonerm3 View Post
It's backed out I'm almost certain of it. There would be major metal chunks if it had ripped fully. You probably have cracks there but i don't think it's ripped out.

I bet what happened was the bolt was torqued against a painted surface or onto seam sealer and sometimes when tightened against fresh paint the bolt isn't as tight was we think. The material under the bolts breaks down and bolts loses the purchase it had originally.

Get it tightened back up but while your there you should fix the broken welds which are inevitable imo and add a through bolt to the front mount.
Thanks for the insight man.. Was starting to think along those lines. Checking out Vince's front bolt solution looks to be the business too!
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Old Mon, Apr-17-2017, 03:03:32 PM   #10
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Default Re: Subframe front mount point problem

Quote:
Originally Posted by PITT M3 RR View Post
Could have been that way all along then. I'd see if they cross threaded it or if you can back it out and or in slowly, smoothly.

Up at the plate, can you tell if there are engagement marks from torquing? If the plates were installed and coated then the bolt was threaded in and tightened all the way, there will be the scratches / marks from it touching and rotating. If they're not there, it was never tight.
Cheers.. checking the marking on the plate is a great suggestion, thanks man, I'll have to check that!
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Discussing Subframe front mount point problem 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)