Hi Will
DMFs seem to me a dreadful invention with numerous people suffering early failure, I'm sure driving tecnique has something to do with it but the failure rate to my mind is unacceptable. I have steered clear of cars fitted with DMFs until recently when I bought a Peugeot 406 Hdi fitted with one, when I bought it the clutch pedal biting point was high combined with a squeal sometimes when you let the clutch in. As I bought the car cheap I half expected a failure but so far have covered 12,000 miles with no apparant deterioration and the car has covered over 200,000 miles - but I do drive very gently. I sold a CitroenXM diesel at 292k whith the original clutch although it had started slipping it was still quite driveable.
The difference between clutch and flywheel failure are again dependent on driving style, as you mention 'riding' the clutch with cause clutch wear but shold not cause DMF failure, that is caused by the load put on it, towing can increase wear on both clutch and DMF but not necessaraly, it depends on how gently or fiercely you pull away.
There is not really any neccesity to slip the clutch on most diesels when pulling away as the torque available will move you off at tickover on the flat at least, but there is no doubt that rapid take off's at high revs will considerably shorten the life of both components.
Peter
Edited by Peter.N. on 28/02/2012 at 10:17
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