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      10-20-2020, 07:50 PM   #1
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I posted this in the M2C forum but I didn't get any feedback, so I am hoping my issues get more traction here since we share same motor and there are a lot more F80/82 on the road than F87.

I self-diagnosed the below issues to a failed dual mass flywheel (DMF). Am I on the right track?

Observed Symptoms:

1. Oftentimes, the first gear is extremely jerky. It does not happen every time, but enough to make me question if I can still drive manual transmission (which I have been doing for close to 30 yrs. now…)
2. Recently, I have started noticing that, while idling at stoplights, the engine is making this weird ticking noise, with a very a steady cadence (tacatacatataca). This noise simply goes away when I clutch in. Please see the quick clip below: the distinct ticking noise goes away around 3sec mark when I clutched in.
3. Not always, but clutching + shifting gears result in a noticeable 'clunck noise' that I can feel and hear.

https://drive.google.com/file/d/120K...ew?usp=sharing

Car details:
1. 2019 M2C (S55)
2. About 5,000 miles
3. 6 speed

It seems to me that the issues are related. So what do you guys think, is this pointing to transmission/DMF failure (excessive play between the 2 DMF halves), engine valve lifters (seems unlikely) or something else completely different?

The car is quite new given the mileage, so I'm surprised that something this major has failed.

Thanks in advance for any input!

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      10-23-2020, 02:07 PM   #2
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I believe number 1 and 3 are normal, with 1 being more pronounced in Sport+. I have a manual F80. In regards to number 2, I’m not too sure but if it something more engine related? Sounds like the engine is knocking? Since your car should be under warranty, just take it to the dealer!
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      10-23-2020, 03:05 PM   #3
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All those things unfortunately are pretty normal on an M car. You will hear clunking in a manual. I dont hear anymore stuff because I have my exhaust flaps always open. But what you describe doesnt seem like problems with the car IMO.
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      10-23-2020, 03:32 PM   #4
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Yeah, thanks for the input guys, I appreciate it. Maybe I'm paranoid, but I didn't hear these kind of noises in my E46 nor E92, and the 330ci was deformity refined; I can't believe BMW is making louder machines nowadays. Still, It's reassuring that you guys think it's normal, but not all seems kosher to me, as they say.

Still, I will take it next week to the dealer for sure, but digging further into this, the ticking noise I hear while stopped, in neutral, clutch pedal not pushed in: it might be related to gearbox bearing. Breaking it down systematically, here is what I figured it might be:

1. if one engages the clutch, of course that means pedal is not pushed in and clutch disk is engaged to the flywheel. If noise is present in this state (like in my case) --> then this might point to a gearbox bearing failure.

2. otherwise, if clutch disengaged, that means the pedal is pushed in and clutch disk is disengaged from the flywheel. If there is a noise at this point, then likely the throw-out bearing might be the problem.


If that's true, it might explain the shitty 1st gear starts, I can barely control the car from stalling since the clutch isn't fully engaging/disengaging from the flywheel.

For posterity, will update this post once I hear from the dealer.
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      10-23-2020, 03:37 PM   #5
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Quote:
Originally Posted by jpy1980 View Post
I believe number 1 and 3 are normal, with 1 being more pronounced in Sport+. I have a manual F80. In regards to number 2, I’m not too sure but if it something more engine related? Sounds like the engine is knocking? Since your car should be under warranty, just take it to the dealer!
Yeah, engine knocking was my first thought and was going to pick up some Liqui Molly hydraulic valve lifter additive. However, I can make the ticking noise go away every time by pushing on the clutch, so kind of dismissed it.

I will next try to check if the clutch pedal is vibrating: slightly push in with the hand and see if it vibrates, then it will further validate gearbox bearing might be failing. I doubt it's the DMF though, not much can go wrong with it, especially after 4k miles
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      10-23-2020, 03:52 PM   #6
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Quote:
Originally Posted by No_curebimmer View Post
Yeah, engine knocking was my first thought and was going to pick up some Liqui Molly hydraulic valve lifter additive. However, I can make the ticking noise go away every time by pushing on the clutch, so kind of dismissed it.

I will next try to check if the clutch pedal is vibrating: slightly push in with the hand and see if it vibrates, then it will further validate gearbox bearing might be failing. I doubt it's the DMF though, not much can go wrong with it, especially after 4k miles
I had some lifter tick so I used risoline engine treatment as per this video and it went away. https://youtu.be/3kBArthmDd8
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