Originally posted by 3.0L SVT E0:
1) Dan Nixon made a post about what cars have the DMD and what cars don't. I belive that a mfg. will add the DMD if they think that they need it to take care of NVH issues in a certan chassis. .... If it was there to save the motor from shaking it's self to pieces then why isn't it there on every duratech motor? .... What about the rental companys who buy thousands of Tauruses?
2) It sounds to me like bearings may have been damaged by oil starvation previously and after a little time they let go. I believe that you can hurt a bearing and have it go for a time before it causes a 'rod knock'. It depends on how badly it is hurt.
Roger
In the post you refer to I was making a point that DMD correlated with MTX (Mondeo, Mazda6) and no DMD with ATX(MPV, Taurus)...which fits with my RPM=whip comments. I think ATXs are protected from whip cause they rev much less. The "exception" to the rule is Jag..which can be had with MTX. I just remembered 2 things here...1) I recall the 3L S type with alot of engine failures of ? etio..anybody else remember this..further info??. 2) apparently the Jag V6 is undergoing numerous revisions for 2003..will be interesting to see if DMD is one. Also, again perhaps the Jag gets trimetal bearings or "another" solution to whip...just a thought.
2) You can just as easily say that "the bearings were damaged by crank whip and gave out when subjected to minor, brief oil starvation... circular arguement without data one way or another..
Again, I believe both oiling and crank harmonics are in play. We may never know as the experts have different opininons (Judge, Terry, Procyon.. all of which I respect), and Ford has adressed BOTH issues and moved on. I think we should address both and move on to. I notice the only resistance to this comming from persons with UDPs. With all the discussion at least you that keep the pulleys know the score...but for those without......think very carefully about that mod.
