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Old 10-08-2009, 09:14 AM
ard ard is online now
Resident Curmudgeon
Location: Sierra foothills, California USA
Join Date: Jul 2009
Posts: 15,898
Mein Auto: '12 X5 35d/E39M5/996TTX50
Are people SERIOUSLY thinking that this could, or should, turn into a discussion on "reliability'???

You can be sure that that motor will be disassembled by a quality engineer, that the parts will be back tracked to the original lot numbers, that the damage will be microscopically evaluated- SEMs, Xray imaging, other techniques- that a root cause analysis will be completed. FFailure data from other reports and analyses will be checked...A Corrective Action may be implemented. It may be an extra QC check, it may be an extra cleaning step of the prep for the rod bolts to ensure no contaminants remain that might interfere with torquing, it could be a minor bearing shell revision...there are 100s of possible outcomes. Indeed, there could be multiple 'possible' causes, none proven and multiple actions- or no action but a decision to simply 'monitor failure data for trends'

And we will most likely never know a thing.

To speculate on what this means to the rest of the population of these motors is.... fruitless.



PS I would dearly like to see the final failure analysis- I suspect it would be quite a piece of engineering effort. Definitely not ending in "the rod broke" or "looks like a bad bearing"....
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