Overheating of the secondary flywheel Overheating of the secondary flywheel Cause:Caused by incorrect clutch use, e. g. clutch slip.Result:Heat counteracts the effect of the damping grease. Sliding shoes, spring plate, and springs run dry.The vibration damping function is limited and/or can no longer be guaranteed.Heat spots can cause clutch grabbing.Comment:Clearly visible annealing discolouration and heat cracking. Primary flywheel is worn through Primary flywheel is worn through Cause:Extreme mechanical strain on the entire DMF.Result:Destruction of interior components In extreme cases, internal components wear through the housing of the primary flywheel. This leads to total failure of the DMF.Comment:Grease leakage is another sign of this problem. Signs of overheating inside of the secondary flywheel Signs of overheating inside of the secondary flywheel Cause:Thrust bearing wear between primary and secondary flywheel due to mechanical strain.Result:The vibration damping function is limited and/or can no longer be guaranteed.Comment:Clearly noticeable by the annealing colours, as well as the unusual vehicle noise that gets stronger when disengaging the clutch.