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Thread: DMF failures, quick observation. Comments please...

  1. #1
    Regular Member Chocki's Avatar
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    Default DMF failures, quick observation. Comments please...

    Reading lots of posts on here it would seem that in the majority of cases people that have had a catastrophic DMF failure have also had a catastrophic clutch failure, also talking to a VX mechanic yesterday he also said that in every case he has seen of DMF problems the clutch has been very worn.

    Now is it because the clutch has been ridden lots which generates a lot of heat which would knacker the bearing that sits between the two moving parts of the flywheel, this would then allow the two sections of the flywheel to (for want of a better word) flap about and destruct.

    The question is for anyone that has had a failure, do you ride the clutch?.

    If there is a pattern to this, then simply not riding the clutch should prevent premature failure.

    Thanks.

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    Regular Member Maverick's Avatar
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    Mine was changed after it had done 20,000 miles as a demo car, so who knows how it was driven.

    But i have never ever known one have a catastrophic failure. Only noisey.

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

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    Engine : 1.9 CDTi 150

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    I have known a few to be very noisy (like mine was for over 10K miles) but none that have failed. Mine was a pool car from new to when I bought it at 50K miles so it will have been driven like it was stolen no doubt, so you could be right, but I would imagine that constant use (i.e. town driving) is the main cause to the DMF rattles.

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    I don't know why people just don't weld (or bolt) the two halves together and fit a damped clutch plate. Is the clutch plate non damped in Vectras when nthere is a DMF fitted?

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    Regular Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

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    as many of the cars owned on here are secondhand or more most owners will have no idea of how it was driven prior to their owning it.. I bought mine with 41K on the clock and the dmf rattling.. I have done 8k with it in that condition.. I already have bought a replacement dmf and clutch to go in but am in no hurry as its only noise when idling and I will get a few more miles out of the exisiting dmf and clutch yet.. I was thinking of having it done this month but the longer i leave it while it drives ok the longer the i will have to wait for the replacements to wear out if you catch my drift.. I have seen some pics of DMFs that appear to have disintergrated when they are removed, i do not wish to take it that far though, but that does seem to be rare..

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    Regular Member 67688c's Avatar
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    Quote Originally Posted by Chocki View Post
    Reading lots of posts on here it would seem that in the majority of cases people that have had a catastrophic DMF failure have also had a catastrophic clutch failure, also talking to a VX mechanic yesterday he also said that in every case he has seen of DMF problems the clutch has been very worn.

    Now is it because the clutch has been ridden lots which generates a lot of heat which would knacker the bearing that sits between the two moving parts of the flywheel, this would then allow the two sections of the flywheel to (for want of a better word) flap about and destruct.

    The question is for anyone that has had a failure, do you ride the clutch?.

    If there is a pattern to this, then simply not riding the clutch should prevent premature failure.

    Thanks.

    No I was not in the habit of riding the clutch, though I understand your theory. I've had a few vx cars, including my last vec-c 150 and did 40k in the vec before I bought a Insignia.

    The Insignia however had it's DMF fail at around 3K miles. It's gearbox failed completely at 4k and VX agreed to have the car back.

    GM/VX have since changed suppliers of their DMF units on that model due to the number of DMF untits going faulty. Our remaining one Insignia had it's DMF fail at 24K miles. One member had as many as 4 DMF's units in less than 7K miles.

    I used to pull a heavy caravan with the vec-150, and even had a little clutch smell 2 or 3 times, when I had needed to make a second attempt to reverse the van into postion on sites. However I never had any issues of failure with that car. Probably down to luck perhaps.

    TBH I think most dmf failures are simply down to poor manufacter and flaws in design. Except for small engined cars almost all front wheel drive cars now use some form of DMF, so we are pretty much stuck with them.

    One could of course always buy an auto.
    Last edited by 67688c; 5th March 2010 at 12:51.

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