Originally Posted by LEZ
I had to look all this clutch and flywheel stuff up DMF etc interesting another expensive piece of kit to go wrong and cause grief yeeee ha.
LUK has been making DMFs since 1985. They made significant market penetration, I'm certain they have the engineering down.
Sachs was probably specified based on cost alone. The root cause of the failure is the aging of the Nylon epicyclic bushings, something which accelerated age testing didn't take into account.
Cogging of the bushings assures rotation which prevents flat-spotting. And being cast, cost is low. Weight is also a function.
The LUK design dispenses with the Nylon cog and spring bushings, using only two long springs instead of 10. And full diameter plain bearings, probably metal on metal but lubricated with the MoS2-silicone grease common to these designs. We shall see the life span but history has shown good results.