Quote:
Originally Posted by Bmwdoubles_
I saw a post from 2018 kinda of around this issue but not as detailed as that video. Those guys show pretty good proof the the number 1 upper bearing is taking a heavy load explaining that the S85 doesn’t see that due to a single chain as opposed to the S65’s double.
I appreciate what you and your team do. Can you elaborate a little more as to why this wouldn’t be the culprit or why this not a preventative maintenance item?
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The MB issue has been a known issue for several years. Fortunately, the wear rate is much slower than the RB wear rate. MB #1 is the most abused. MB is not the primary cause of RB wear, it’s the tolerances of the RB that are the primary cause of RB wear.
It requires a costly engine-out job to correctly replace the MBs unlike the simpler engine-in preventative RB replacement. Once the engine’s out, it makes more sense at that point to do a full engine rebuild.