E46 Subframe Mount Repair
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  1. #1
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    E46 Subframe Mount Repair

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    No warranty of any kind implied or given and no liability accepted for any loss, damage or injury, no matter how incurred.

    General
    I've been researching this for a while and the consensus appears to be that, on the M3 at least, it is not an if it goes but a when.

    Here's some handy links, the PDF is the best I have seen for info on how to fit one of the reinforcing kits available.

    http://www.turnermotorsport.com/imag...nforcement.pdf

    The URL for buying the kit (they deserve to make some money for the detail in the PDF alone)

    E46 Rear Chassis/Subframe Reinforcement Kit - Turner Motorsport

    And the gallery.............

    BMW E46 Subframe Failure


    I've noticed a couple of kits out there, one where some of the cracks were welded up outside the area of the reinforcing plates, this one looks big enough to cover all but don't take my word for it as not done the job with any yet.

    The easiest way to fix this appears to be to have a car with full history, standard suspension and less than 10 years old and approach the dealers for assistance.
    Last edited by e36coupe-328; 03-11-2012 at 14:48.
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  3. #2
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  4. #3
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    I'm thinking of getting the reinforcement plates installed, as the thought of this happening scares me. Hwever I'd rather just do as much as possible, removing suspension, dropping subframe etc. myself but can't weld!

  5. #4
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    Charlie, if your car hasn't got any signs yet and its standard I would just get the foam injected. your car isn't really powerful enough to crack the floor with normal driving. that's assuming your car is post 03 2000. they start to crack in the fold in the passenger rear mount area first then pop the spot welds as well. I researched this for years when I bought mine. although the floors are a bit thicker on the newer ones and they have extra welds they still can go if abused badly enough. as said m3's are prown as they are powerfull. so to does big engine touring models as they carry more weight in the rear than most other models would.
    the fault was first found in America on the race track were the powerfull cars and extreme driving rapidly accelerated the process. the e46 came out in 98 and by 2000 it was being fixed. good job those yanks abused them or we may of had thin floored cars for most of the production run of the e46.

    it goes in that area first as its a twisting force due to where the differential mounts. most stress is put in that area. if it wasn't for the twisting inertia s well as the back and forth motion chances are it would not fail.

  6. #5
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    Quote Originally Posted by e36coupe-328 View Post
    I've noticed a couple of kits out there, one where some of the cracks were welded up outside the area of the reinforcing plates, this one looks big enough to cover all but don't take my word for it as not done the job with any yet.
    Larger plates that should address the above
    E46 M3 Floor Crack - Redish Motorsport Ltd - BMW Specialists of Bristol
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  7. #6
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    Quote Originally Posted by CharlieUK View Post
    myself but can't weld!
    Maybe time to learn, it's not hard

    Quote Originally Posted by vauxfan View Post
    assuming your car is post 03 2000
    They can still crack, thinking that avoids the issue is a myth
    Last edited by e36coupe-328; 05-02-2014 at 17:49.
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  8. #7
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    I know they still crack but the abuse is more the issue. I did put that in the post. floor is thicker material and more weld spots. e46fanatics has a running page on this. all years and models with the fault. most post 03 2000 cars are the 3l and m3's, more m3's than 3ls. they also like to charge there cars and constantly drag them. not many cases here however. mine had just short of 130k on the clock I did 20k of them with eibachs and poly bushes. I wasn't very careful at times and I liked to abuse it as well. no signs of any pending failures under neither either.
    it is more a case of abused cars that inevitably break and abused m3's. I would just inject the boot on any m3 that is not heading for a race track or to some one who will abuse it.

    when you quoted line 2 you should have quoted the end of line 3 and in to line 4.

  9. #8
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    Agree that it is usually more powerful or used cars but there are plenty of examples out there of other engine sizes in various years. It's certainly worth a look if buying.
    Also many times a cracked car passes MOT and garage inspections looking specifically for the issueand the cracks may only be revealed if some of the rubberised sealer is removed.

    Post 4 Anyone read Total BMW? - The M3cutters - UK BMW M3 Group Forum
    2000 E46 318 touring - cracked subframe repair kit, available in the UK?
    E46 rear subframe mounts... - PistonHeads
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  10. #9
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    I would never buy an e46 with out checking. even the newer 1s.

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