T6 DSG with 70k on the clock here and I seem to have the same issue. On idle in neutral, I hear a chattery sound come and go intermittently. Been under the van and it definitely sounds like it's coming from the clutch/flywheel. According to the history it also had these changed at low mileage (around 30k) under warranty due to a sound reported by the owner at the time.
Sound recording attached. It sounds a lot louder than it is as my phone is recoding right next to the flywheel.
Has there been any developments on why this issue tends to occur, is it conclusively the Dmf, clutch or possibly one of the bearings which has a tendancy to go?
Will it eventually go pop and cause other issues or am I ok to ignore it for now?
Are there any clutch/dmf/bearing part numbers/revisions/brands to avoid or specify to fix?
Thanks
Your post reminded me that I had not followed up to report on my fix. Yours sounds much like mine did, although perhaps my noise was harder-edged, more clonky. My noise seemed more obviously clunky when listening at the wheel arch, beside the rear of the left front wheel. I think its a good bet that it is also the Dual Mass Flywheel.
Re your other questions - my short and completely honest answer is "I don't know". A longer answer if it's any help - I can tell you what I saw when reviewing the knackered parts after mine was repaired, and what the garage guy said. For context, I've known the two garage guys, dad and lad, for over twenty years both socially and via business, and I have a good relationship with them. There was little to see or feel in the knackered parts compared to the new parts. The centre part of the flywheel compared to the outer part had a little more wobble, both rotationally (anti-clockwise and clockwise), and if you tried to push/pull each side of the centre part away from and towards the outer part. But if you tried hard you could detect a small difference. But nothing that would obviously account for the loud rattle that you could clearly hear before the repair.
Mark's view was that what I was looking at was typical of the many that he has done on other DMF s on many cars. Surprisingly little to see that was causing such a loud rattle. But he has done very few DMFs on transporters.
I had asked him the same question on will it eventually go pop or bang. Mark said his experience was that he had not seen any yet that had gone bang. He had several customers (farmers) with landrovers that had rattled badly for years and never gone bang. But most customers were like me and became either fed up with, or worried by the rattling racket, and asked him to replace them,
Finally, for transporters, he said there were only two manufacturers of DMF's available for transporters as replacements (for T6) . I forget what he said they were. (Several manufacturers overall). He hadn't noticed any single make failing (that he'd removed). He fitted DMFs from both manufacturers and so far he had not had any come back again.
Hope this helps.
