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08-23-2019, 05:29 AM | #45 | ||
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08-23-2019, 11:47 PM | #46 |
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How many miles?
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08-23-2019, 11:51 PM | #47 |
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Yes, >2010.5 should have tin aluminum bearings that are harder but also more eccentricity (more oval shaped to allow oil circulation). Should not see any copper color.
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08-24-2019, 05:13 AM | #49 |
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08-24-2019, 05:31 AM | #50 |
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Abit late to the party.
Sorry about this I'm new to the forum and don't know how to create a new thread just yet.. I'm hopefully buying a 2010 60 E90 m3. Mileage is at 77000. The dealer is unable to tell me if the RB has been done and I can't find any evidence to show they have been done... At this mileage is it most likely that they've been done in the past? Is there anything else I need to look out for?
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08-24-2019, 07:05 AM | #51 | |
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08-24-2019, 07:15 AM | #52 |
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08-24-2019, 08:22 AM | #53 |
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The mileage does not really matter. Engines have failed at 6k. EAS just did bearings on a 31k mile motor and they were badly scored. And other cars seem to be doing fine at 100k or more on original bearings. Based on the pictures of bearings that come out, I’d say 90% look excessively worn for the mileage.
I changed mine in 2014 when my extended warranty ran out. A warranty is a reasonable hedge against the risk. Would be a lot more down time and inconvenience than doing a preventative maintenance change in one day, but other than the off the road time difference, your exposure should be limited to your deductible. |
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08-24-2019, 08:54 AM | #54 | |
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08-24-2019, 11:38 AM | #55 |
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Thank you !
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08-24-2019, 11:41 AM | #56 | |
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I'm so sorry to hear this ... Please keep us posted regarding your situation .
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08-24-2019, 12:51 PM | #57 | ||
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08-24-2019, 07:02 PM | #58 |
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Exactly. The warranty would come into play only if there is an engine failure. Since that could be a $20k claim, it will investigate. Your car could be out of action for a month or two. It’s one way to hedge the risk, though. Could be your car, like most of these M3, keeps on driving fine through the warranty period, after which you would change them preventatively or sell the car or roll the dice and keep driving (they call that self-insurance).
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08-25-2019, 07:27 AM | #59 | |
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08-25-2019, 07:44 AM | #60 |
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That is the dilemma, but if you review the many pictures of removed bearings, you will see that 90% look bad. Based on that sampling, my guess is that 90% of the bearings in the 90% of cars that are still on stock bearings also show excessive wear. To play the devil’s advocate, one would then ask why the 90% of cars still on original bearings aren’t blowing engines all the time. The blown engine reports are fairly steady and have not been dramatically increasing. The unofficial tally might be a few hundred — just guessing, but 1% of production might be fair.
Again, your roll of the dice. A risk assessor would say the odds are against your engine failing. If it fails, it could cost $20k to replace. The insurance premium for preventatively changing bearings is $2000. Probably around 10% of owners have chosen to pay it. |
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08-25-2019, 11:16 AM | #61 | |
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Drives: 11 E90 M3 Individual
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I recommend swapping in a used motor. Easier, cheaper, faster, and less of a chance of installer error. If you decide to rebuild and turn the crank, you must harden the surface by heat treating it (plasma nitiriding is the term I believe). The crank won't last very long if you don't. Once you grind the surface off, you expose a surface that is not heat treated. I had my S54 crank turned, used undersized bearings and it lasted 12k miles (mostly track). That's why I recommend going with a used motor. Heat treatment nitriding is going to run $800-$1000 by itself (plus grinding, polishing, straightening and balancing the crank). Where in TX are you located?
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08-25-2019, 10:59 PM | #63 | |
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08-26-2019, 03:02 AM | #64 | |
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There is no shortage of documented RB failures spanning 08-13. Next time you go to that dealership, print and bring copies of the attached to the "techs" you spoke with: https://www.job-applications.com/mcd...plication-pdf/
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08-26-2019, 05:20 AM | #65 | ||
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08-26-2019, 06:45 AM | #66 | |
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If you don’t want to learn, just listen to your dealer and roll the dice— the odds are actually with you. However, if I had a 2011-2013 production car that was out of warranty, I would be changing the bearings preventatively. |
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