Forgive me for kicking this rock yet again but I'm trying to understand the "current status" of the situation. I just purchased a new 2009 LT about 3 weeks ago and I'm just trying to understand what may
potentially be an issue in the future. I'm not going to lose sleep over it but if there is anything from a preventive maintenance standpoint that can be done I'll do it. I've read most of the material on this site to include the failure data base.
I understand that BMW has not acknowledged the problem but does anyone know with certainty what the cause is? I know it sounds like a stupid question but with so many failures it seems strange that the true cause hasn't surfaced yet. Or has it and I missed it some where among all the metal chips?
Most bearing failures in machinery occur for several reasons:
1) Lack of lubrication. Doesn't seem to apply in this case.
2) Manufacturing defect in the bearing. Most defective bearings fail early in
their service life.
3) Poor engineering design. Is the design of the FD and the loads it sees
keep the unit on the ragged edge of serviceability? Crap I hope not but it
could be. I noticed that the FD failures dropped significantly in recent
model years but still exist. I believe I read a new large bearing was
incorporated within the last several years. The failures still continue albeit
at a reduced level so it brings me to the last option.
4) Set-up. Has anyone published the proper set-up procedure? There has to
be some sort of preload check on a set up like this, right??? Or has this
been an issue of bad bearings and improper set-up?
If you have the latest and greatest bearing installed and had a method to verify a proper set-up then wouldn't that increase greatly our chances of FD happiness?