Rattle on engine off

[Acheron83]

As per the video below:

My car is a 6MT N54 with 60 000km on it and when I turn the car off in neutral with the clutch out I get the above rattle. Putting the clutch in and turning off in gear or neutral the sound is no longer present. Additionally when pulling off slowly from a standstill I can detect some similar rattling (much quieter) in 1st/2nd.

My local dealer claims to have replaced my clutch and flywheel in an attempt to resolve this to no avail. We tested 2 other 135i's and a 1M and none make this noise despite having similar mileages. I've searched this forum and I don't appear to be the only one with the issue, but some say this is normal despite many other cars (as proved by the tested 3) not making any noises either on switchoff or at pulloff.

I'm stuck and so is the dealer not knowing what can be done to resolve this. Any ideas?

[One35iMT]

At least your local dealer replaced your clutch and flywheel.
I have the same issue with 6 M/T and I took it to the dealer, When i first brought it, they said they can't hear the knocking sound after engine off. After couple visit, I show them the rattle sound and they told me they can't do anything about it because it's chattering the flywheel something something.....My dealer didn't even try to look into it.
What did you say to your dealer?? i want mine to be replace also.

[marc@x-ph.com]

Flywheel chatter, most of us have it and can;t do anything about it. My previous car had it even after I changed my flywheel and clutch. my current N54, with only 23k has it as well.

I learned to just keep the press depressed till the engine is turned off.

[Dmacc]

Originally Posted by marc@x-ph.com

Flywheel chatter, most of us have it and can;t do anything about it. My previous car had it even after I changed my flywheel and clutch. my current N54, with only 23k has it as well.

I learned to just keep the press depressed till the engine is turned off.

This, if you do not like the sound, just keep the clutch pedal pushed in when you shut off the engine, you will not hear that chatter noise.

[Acheron83]

Originally Posted by Dmacc

This, if you do not like the sound, just keep the clutch pedal pushed in when you shut off the engine, you will not hear that chatter noise.

That is what I have been doing since the issue started. What it does however not resolve is what is causing the issue to begin with. If the noise was present in every manual 135i I'd be satisfied but clearly that is not the case.

[cheshirecat79]

Originally Posted by Acheron83

That is what I have been doing since the issue started. What it does however not resolve is what is causing the issue to begin with. If the noise was present in every manual 135i I'd be satisfied but clearly that is not the case.

This is a very common trait of dual mass flywheels. While some 6MTs may not have the issue, I would just plan on pushing in the clutch when you shut the car off.

[b1aze]

Mine does it also.

[One35iMT]

seems like every 6MT does that...

[Acheron83]

Originally Posted by cheshirecat79

This is a very common trait of dual mass flywheels. While some 6MTs may not have the issue, I would just plan on pushing in the clutch when you shut the car off.

Common trait or not the fact that it hasn't always done it on my car, there are multiple cars I've tested that do not do it and the fact that both the clutch and dual-mass flywheel have been replaced leads me to believe that whatever is causing it is in fact component wear related, but not directly related to what is commonly replaced when doing the clutch/flywheel through a dealer.

Some may be happy to accept the explanation that it's a common, non-serious issue, but I'd rather be safe than sorry and keep pushing this to be resolved by the dealer.

[Stohlen]

Originally Posted by Acheron83

Some may be happy to accept the explanation that it's a common, non-serious issue, but I'd rather be safe than sorry and keep pushing this to be resolved by the dealer.

The flywheel is two pieces connected by springs, when the clutch is pushing up against the flywheel, it is much more prone to rattle like that because of the additional side force... When you cut the engine and it stalls out, the flywheel oscillates back and forth rapidly because of the springs. You can complain to the dealer, but the truth is that it isn't doing any damage and every flywheel will do it over time as it wears.

[Acheron83]

Originally Posted by Stohlen

The flywheel is two pieces connected by springs, when the clutch is pushing up against the flywheel, it is much more prone to rattle like that because of the additional side force... When you cut the engine and it stalls out, the flywheel oscillates back and forth rapidly because of the springs. You can complain to the dealer, but the truth is that it isn't doing any damage and every flywheel will do it over time as it wears.

...but my flywheel was replaced

[Stohlen]

Originally Posted by Acheron83

...but my flywheel was replaced

Some wear faster than others. Regardless it's due to the spring feature in the flywheel. If you want it to go away put a single mass flywheel in

[Acheron83]

Originally Posted by Stohlen

Some wear faster than others. Regardless it's due to the spring feature in the flywheel. If you want it to go away put a single mass flywheel in

Understandable, however the flywheel and clutch were replaced less than 3 weeks ago and I've racked up hardly 300km since. The day I collected the car after fly replacement the rattle was still present.

[cheshirecat79]

Originally Posted by Acheron83

Understandable, however the flywheel and clutch were replaced less than 3 weeks ago and I've racked up hardly 300km since. The day I collected the car after fly replacement the rattle was still present.

you were told it was replaced....

[Acheron83]

Originally Posted by cheshirecat79

you were told it was replaced....

Correct. On Friday I also requested my motorplan history which reflects that the change was done.

[cheshirecat79]

Originally Posted by Acheron83

Correct. On Friday I also requested my motorplan history which reflects that the change was done.

Oh, right. The motorplan history.

Anyway, good luck on your quest to fix the dual clutch chatter.

[Dackelone]

Your making a problem where no problem exists. This is totally normal for a dual mass flywheel to make a noise when turning the engine off.

A dual mass flywheel has to parts connected via springs. It will make this "rattle" noise when the engine spins down on shut off. I'm pretty sure it says in the owners manual to press down on the clutch when switching off the engine. That is what I always do.

I am not sure why some of the other cars you tested do not make this noise. Maybe you drive harder with the clutch(during shifts) and your flywheel springs have compressed some what.

IF this noise really bothers you could always try to lemon the car. But I think that is not really called for. But then again I have seen people "lemon" a car bc the rear seat DVD player(s) skip! lol To each his own.

[Acheron83]

Originally Posted by cheshirecat79

Oh, right. The motorplan history.

Anyway, good luck on your quest to fix the dual clutch chatter.

I don't know why you feel the need to be sarcastic, but let me clarify my last post. I checked whether it was recorded on the motorplan history as it stands to reason a dealer would be less likely to defraud a motorplan claim (thus potentially landing themselves in a heap of shit) than to tell a customer they'd done something they haven't with no evidence to bite them in ass later. This was merely another step to check off from my list to assure the dealers were doing all they said to resolve the issue before taking it up with the national BMW guys.

That said, I've scored a new flywheel and clutch out of the situation and the issue is still open on the dealers side. Perhaps I'll score some more freebie replacements or perhaps they'll resolve the noise (issue or not).

[Dmacc]

FYI, single mass flywheel does not solve the chatter issue when turning the engine off.

And my car had this noise with 50 miles on the odometer, and everyone I've spoken to who had a manual transmission has had this noise from the factory. Maybe it wasn't noticeable until now for you? Just a thought.

[Acheron83]

Originally Posted by Dmacc

FYI, single mass flywheel does not solve the chatter issue when turning the engine off.

And my car had this noise with 50 miles on the odometer, and everyone I've spoken to who had a manual transmission has had this noise from the factory. Maybe it wasn't noticeable until now for you? Just a thought.

It's quite possible that it has been there all along and I've never noticed it, but I would think it's gotten louder until I noticed. I switched the car off with the clutch out (in neutral of course) many times before in my garage where the rattle echo is quite severe and only heard it for the first time recently.

That said, the dealer has now taken the decision to replace the entire gearbox. I'm not going to argue with them, because "Hey...free gearbox!", but I have my doubts as to whether it will resolve the noise.

[marc@x-ph.com]

It won't. I got my gerabox replaced for nagging on something different. and I knew before hand it wasn't going to solve the issue. Your case falls under the same umbrella. If he doesn't change the flywheel, then you don't even have the slightest chance.
Even if he does, and say it goes away, It will come back soon.

It's one of those things that we MT owners just have to learn to live with.

Free gearbox, why not

[suspect]

Originally Posted by Acheron83

It's quite possible that it has been there all along and I've never noticed it, but I would think it's gotten louder until I noticed. I switched the car off with the clutch out (in neutral of course) many times before in my garage where the rattle echo is quite severe and only heard it for the first time recently.

That said, the dealer has now taken the decision to replace the entire gearbox. I'm not going to argue with them, because "Hey...free gearbox!", but I have my doubts as to whether it will resolve the noise.

Did the new gearbox ever fix this noise for you? Having a similar issue.