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DMF (Dual Mass Flywheels) a necessity ?

DMF (Dual Mass Flywheels) a necessity ?

DMF (Dual Mass Flywheels) a necessity ?

(OP)
It appears that VW and Audi cars with 1.8T engines and manual transmissions have been suffering early and catastrophic failures.  This appears to be due to failure of the DMF that is coupled to this system.

It appears that some DMF designs are dry and some are wet.
Would I be correct to say that leakage from a "wet" DMF would contaminate the disc and cause excess slippage and heat buildup between the pressure plate, disc, and flywheel?

Does anyone have any statistics concerning the failure rate among different manufacturers / vehicles ?

Interesting as the concept is, I am not convinced that the advantages, e.g. reduced driveline noise/vibration,
outweigh the additional expense of the DMF itself and / or the reduced reliability factor inherent in the design as opposed to a single mass flywheel.

Can anyone tell me how long the DMF manufacturers warrant their flywheels to the OEMs ?

Is it possible for the planet gears to strip out in a DMF and render a vehicle undrivable?

Is it possible for the grease in the DMF to leak out and contaminate the clutch disc, again rendering the vehicle undriveable ?

Do any OEMs authorize the replacement of a factory installed DMF system with a single mass flywheel system and still retain any unused powertrain warranty coverage ?

Comments ?

Bruce Toski
ASE Master Certification
Automotive Instructor

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