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05-14-2022, 12:29 AM | #1 |
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Another Bearing Story
I'd spent a very long time debating whether or not it was necessary to change the rod bearings on my M Roadster. The guy I usually take my car to get serviced said it wasn't really anything to worry about. Generally he is spot on about this engine as he has a lot of experience with it.
With my 2006 car approaching 116,000 miles I took the steps to swap out the bearings for piece of mind, as hopefully I won't be selling the car. In addition I'd had a VANOS exhaust hub upgrade, valve adjustment, and oil change planned. I was a little apprehensive about using another shop but they came very well recommended in the San Diego area. I was somewhat apprehensive about spending all the money, but I felt validated when the garage called to tell me the OEM exhaust hub had snapped one of the tabs, so that by itself was a miracle it didn't wipe out the timing chain. I got the car back today and the engine just sounds so much more refined. It probably wouldn't be noticeable to anyone else but having driven this thing 70k miles since I picked it up the difference was immediate. A lot of the upper bearings had copper showing, which was interesting as my blackstone reports never had more than 1 PPM reported. Anyway, the money shot is shown in the photos. The upper bearings are on the right and the lower bearings are on the left. I read in the other recent bearings thread that copper showing is not indicative of an impending catastrophic failure, but its definitely given me good piece of mind to do this. There is a close up of the most heavily worn bearing. |
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grannyknot1000.50 racerbruce3866.00 GuidoK12620.00 JustinHEMI7481.00 XMetal1212.50 SunUpTopDown363.50 Coi298.50 |
05-14-2022, 08:42 AM | #2 |
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A few weeks ago there was another car with similar mileage (125k) and rodbearing pics.
Those bearings were less worn, only 1 shell had some copper shining through: https://www.zpost.com/forums/showthread.php?t=1918163 I guess there's a reason specialists say that the recommended interval on these bearings is about 50k miles
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Last edited by GuidoK; 05-14-2022 at 10:02 AM.. |
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05-14-2022, 12:25 PM | #4 |
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Good call on the bearing change. For some reasons, copper doesn't show up well on the Blackstone test.
Even with both taps in place, my car sounds like a can of marbles rattling around between 2k-3k. It now purr like a sewing machine after swapping in the Beisan redrilled hub disc. BTW, who did all the work for you in San Diego?
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05-14-2022, 05:22 PM | #5 |
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It's kind of interesting to see the difference between yours and mine based on mileage. As mentioned in my thread, perhaps the previous 3 owners have kept it low revs for its first 125K miles. That's OK, she's being driven the way she was meant to be now.
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05-14-2022, 08:34 PM | #6 | |
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It was B and B Autohaus. Extremely good service. |
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05-14-2022, 08:36 PM | #7 | |
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Am I being too overcautious limiting the RPM for the first 500 miles? Thats what the shop instructed me to do. |
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05-14-2022, 08:42 PM | #8 | |
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05-15-2022, 07:08 PM | #9 |
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Two cars with 100K+ miles and still running just fine. What do you want? Perfect bearings? I’m not dismissing the fact that S54s have a rod bearing maintenance interval. I don’t understand cutting it in half — at least — based on this evidence. 90K miles on mine, 3 attentive and enthusiastic owners. I’ll get to them, but in the meantime I’ll enjoy all 8K.
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05-15-2022, 07:38 PM | #10 | |
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05-16-2022, 03:33 AM | #11 | |
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And correcting that costs probably around 6 times as much (if it isn't more) There are also people that don't change their oil.
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05-17-2022, 11:52 PM | #12 | |
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05-18-2022, 12:08 AM | #13 | |
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Will those last to 70k? 80k? Who knows But I'm glad I didn't take that chance.
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05-18-2022, 12:16 AM | #14 |
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Ouch yeah I see what you mean.
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06-07-2022, 12:23 AM | #15 | |
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I replaced the bearings in my E46 M3 (US import) racecar a few weeks ago and it's above 10K+ miles. The bearings looked really good and I suspect they were replaced early in it's life during an action in the US.
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