Boot floor / Sub-frame / Diff mount failure thread

[MrMicko]

I have two cracks at differential mount, BMW refuses to pay the repair and dealer has stopped answering my mails :)

But my cracks are minor, easy to fix.

[Lee]

sorry to read this Dendeman,

I hope BMW take this seriously

Good luck!

[Broccers]

Cripes - keep us up to speed with progress.

Best of luck.

Simon.

[chippy]

Blimey :shock: :shock:

I've had all the trim out of the coupe this weekend, after fitting my Schnitzer race suspension, and had a good look for any cracks. Thankfully all clear but i'll be checking every 3 months from now on especially with having the upgraded diff :roll:

Hope you get it sorted ok!

[Lee]

Originally Posted by chippy

Blimey :shock: :shock:

I've had all the trim out of the coupe this weekend, after fitting my Schnitzer race suspension, and had a good look for any cracks. Thankfully all clear but i'll be checking every 3 months from now on especially with having the upgraded diff :roll:

Hope you get it sorted ok!

just checked mine also

looks like the day it rolled out of the factory!

I guess it comes down to the person who did the weld and how competent they were?

did they change the procedure for later cars??

[dendeman]

Thank you all for the support and I will keep you posted.

... looks like the day it rolled out of the factory!

I think a regular check should be carried out by all M Coupe owners, as I has inspected the sub floor about a year ago and it was perfect. It only takes 5-10 minutes.

The dealer is on "skeleton" staff today, so I'll take it there on Tuesday.

[Lee]

Originally Posted by dendeman

Thank you all for the support and I will keep you posted.

I think a regular check should be carried out by all M Coupe owners, as I has inspected the sub floor about a year ago and it was perfect. It only takes 5-10 minutes.

The dealer is on "skeleton" staff today, so I'll take it there on Tuesday.

If you think there is anything we can all do as a 'club' let us know.

maybe a group letter to BMW GB??

[Rags]

Originally Posted by Lee

If you think there is anything we can all do as a 'club' let us know.

maybe a group letter to BMW GB??

Jesus, that looks bad.

Hope you get it sorted and its a good heads up for all current and imminent MCoupe owners :shock:

[Breadvan Matt]

Lads,
My previous M coupe also had sub-frame failure (99, with 60k miles). The rear bracket holding the diff in place cracked and was repaired. Only found out after I had bought the car and when I was selling it a year later (was spotted by the new buyer during an inspection). The car had been repaired well (by the dealer I bought it off). I never experienced any "creaking noises" or handling issues but it is possible the previous owner did.

And yes, it is a common problem. My US spec M roadster also required some subframe welding work during its life. If I was buying another one of these cars, its probably the first thing I'd check. Thing is, it is sometimes very difficult to spot. Some subframe cracks can be visible from underneath the car only.

[exdos]

Dendeman,

I'm sorry to hear about your misfortune :cry:

It would be very useful if you could give me a "job number" if you get such a thing for your repair. I would propose that this forum, as a collection of MC owners, writes an appropriate letter to BMW about this subject, since it isn't uncommon. BMW should make a recall to all MCs that are potentially prone to this fault since prevention must be better than cure once your car has started to tear itself apart. I will volunteer to write the letter.