Quote:
Originally Posted by Petah78
I concur with all your stated facts. But what are possible warning signs for a spun rod bearing? All the reports of failure that i have seen are for a single rod BUT i have also not seen other bearings from the same engine (maybe i missed this?). My theory is that this can be a sudden or a gradual death, and in the event of a gradual problem, UOA will pick it up.
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Agree there is a lack of info on other bearings since most find the one and "OK there is the problem we are done here" but there have been enough saying just the one that I am comfortable in making the statement.
If there was even one oil analysis that said "we have concerns" I may also change my outlook but there just isn't.
Failure mode and risk analysis of industrial processes are what I have done for 30 years and I will say that with what we have I am about 75% confident that these failures are sudden. I would be happy to change that level (up or down) with a nice big data set but I don't think we are going to get much more info than we already have. Really the only new data I expect is if the mileages go up and there are still multiple failures but at this point they seem to have stopped. Or at least no longer get reported!