Originally Posted by
dom14
They use high tensile springs to absorb the vibration, which has a certain lifespan like a clutch, apparently. It's based on the same principle as the harmonic balancer I reckon, except rather than using a clutch system, liquid or rubber, it uses springs due to the high torque it has to handle. I can understand replacing a cactus DMF. But, why replace a perfectly working one? Do they have such a bad reputation that they can break anytime for no reason?!! I'm guessing when the clutch dies we can have a look at the DMF as well and assess whether it's on it's way and replace if that's the case replace it with a SMF 'cos DMFs are pretty expensive to replace anyway. But, replacing a one in a perfectly serviceable condition is something I don't understand yet.