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12-06-2018, 10:18 PM | #23 |
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Did you do your rod bearings based off results from an oil analysis? Or did you just do the work based off feedback from other threads. I have a 2009 DCT with 92.5k miles and still on original bearings.
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12-06-2018, 10:41 PM | #24 | |
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Make sure you read the comments carefully before looking at the lead #... when I got it back, we suspected some sort of additive in the fuel, because it was SO high.. so I wouldn't use this as a barometer for comparison purposes, because I had one test after God knows what happened before. Car was in great shape otherwise. |
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12-07-2018, 02:43 AM | #25 |
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Thanks for posting OP. 99k is a fair milage and clearly good timing to get some new shells in. That deep scratch I guess from dirt, assumingly your shop checked crank to still be nice and smooth.
You wanne post here as well just to keep things collected in one spot? https://www.m3post.com/forums/showthread.php?t=1253084 |
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12-07-2018, 07:47 AM | #26 |
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You can't be serious....
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12-07-2018, 10:14 AM | #28 |
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Thanks for sharing! Greatly appreciated. I will be changing the oil soon and will get an analysis done to see if it shows similar to yours. Regardless I will definitely look into getting the rod bearings and engine mounts!
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12-07-2018, 10:23 AM | #29 | |
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12-07-2018, 10:54 AM | #30 |
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My M3 has been in the family since new and I have all service records and document all the service I perform. Last time I had leaded gas in the car from a track event was about 6 years ago and it was only a few gallons so that should be out of the system by now. Only other additive I have added would be the Chevron Techron 12oz I added a few months ago. So hopefully that won't throw off the analysis too much.
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12-07-2018, 01:15 PM | #31 | ||
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Your old bearings look pretty poor but not abnormally poor for these engines- pretty consistent for the mileage. Compared to the newer 702/703, old style bearings usually appear worse than they really are. Don't worry about the grooves in the bearings. They're from foreign particles and the bearings did their job to embed the material in the bearing babbit instead of scoring the crank journal. Usually don't see that much foreign matter damage though, even at those miles...I'd make sure your engine seals are kept up and watch your oil change intervals. Use good OEM grade filters like Mahle or Mann. |
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12-07-2018, 01:48 PM | #32 | |||
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12-07-2018, 01:58 PM | #33 | |
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Yes, you can drive normally. Some people want to flush out any assembly lubes shortly after this service but there's not much need. Assembly lube is just oil high in zddp/moly additives and dilutes in the rest of the engine's new oil. If anything it provides desirable extra anti-wear protection. The filter is supposed to remove any foreign particles from reassembly- you can/should change/inspect the filter in 500 miles but exchanging the oil is less critical. Check the valve cover gaskets, oil separator seals, and especially the oil filter housing to block seal, and oil cooler loop. Those are the most common culprits and most higher mile cars we see are well neglected in these areas. |
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12-07-2018, 07:26 PM | #34 |
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Some pics of my RB's: 2008 w/ 76k on them, multiple black stone reports claiming clean bill of health, safe trending etc.
*edit - can't seem to upload a pic from the app. wtf?!
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12-07-2018, 07:31 PM | #35 |
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Did you use the attach button instead of the picture button? only the attachment icon works for me on the app.
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12-07-2018, 07:47 PM | #36 |
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I just hit attach and select from gallery but maybe mine is unique
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12-08-2018, 12:16 AM | #37 |
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I hope my bearings look like that when they come out. It's got to feel good knowing that wasn't $2500 wasted!
Did you go with OEM motor mounts??
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12-08-2018, 06:51 AM | #38 |
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Pics finally worked lol
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12-08-2018, 10:17 AM | #39 |
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Can someone please shed some light here for me. What makes both of those sets of bearings bad and puts them at risk of failure soon? To me they look worn out, but there's plenty of metal left. Also how does wear of ones bearings correlate to failure on cars that had theirs fail at a low mileage?
Firm believer here that this whole thing is blown way out of proportions and vendors as well as shops are taking full advantage of it. Yes, there's failures, but I don't think sets pictured here are those. |
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12-08-2018, 10:23 AM | #40 | |
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12-08-2018, 02:24 PM | #41 | |
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It has been said hundreds of times over...You Can't know when your bearings are going to fail. You can't look at a used bearing and say "yep, that one was only good for another 4,296 miles"... All you can do is go through with the service and move on with the peace of mind. The general consensus as to why some fail early and some later is unfavorable vs favorable tolerance stacking. Yes, I'm a believer because I run a shop and have a finger on the pulse of the issue. And that's not because I get money to replace abnormally worn bearings, but because I see the huge number of failures which are astronomically out of normal proportion. It's a thing. It's not normal. Owners can believe it or not, it doesn't matter to us shops. Consider how many failures have been averted by owners changing their bearings? I guarantee you that if nobody ever did another bearing change ever, then we'd stay just as busy selling more replacement engines instead. FYI, this engine was obviously built with a favorable tolerance stack. This is how bearings should look coming out of an S65 (of any mileage): Instead, we constantly see them coming out like this: |
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12-12-2018, 08:20 PM | #43 |
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Please give me whatever you are smoking. I'll quit my job tomorrow.
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12-12-2018, 08:26 PM | #44 |
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3 friends (none forum members) 2 cars over 120K miles they drive harder than you for sure no single issues. 1 car 143xxx miles only 1 TA replaced no other issue. And guess what? He revs the shit out of it. When I asked them if they replaced the Rod Bearings you know what they said? HUH? WHAT BEER?
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