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09-14-2023, 09:03 AM | #111 |
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crankshafts scratches
Unfortunately, today when I planned to replace my 09 E90M3 with 130,000 kilometers on it, I discovered scratches on one of the crankshafts, clearly caused by metal shavings. What should I do? Do I need to replace the crankshaft? I'm devastated.
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09-14-2023, 09:15 AM | #112 | |
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The best route is removal and rebuild. However if that is not possible and you feel adventurous or in an experimental mood, I would check the journal carefully and confirm there are no proud gouges, clean it up as best as possible and install new bearings. Reassemble and see how long you can go. You might be surprised how many more miles the engine will go. |
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09-14-2023, 05:06 PM | #113 | |
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09-17-2023, 06:16 AM | #114 |
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As the other guys discussed, if they are grooves (which wouldn't gouge any new bearings) and not raised 'lines' (which would gouge bearings), then I'd be installing new bearings and seeing how it goes.
Unless a rebuild is not a major issue for you. Can you see what caused those gouges on the old shells? Have you got full photos of the shells for that journal?
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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09-28-2023, 02:03 AM | #115 | |
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09-28-2023, 02:05 AM | #116 | |
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09-28-2023, 02:06 AM | #117 | |
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10-01-2023, 06:30 AM | #118 | |
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Got any more photos of that?
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Keep us posted. Oh btw, a similar case to yours, although his shells were much worse, the copper had started flaking off! Is discussed in this thread He did 28k miles on the scored crank! (with new OEM bearings), then sold it.
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. Last edited by Assimilator1; 10-01-2023 at 06:54 AM.. |
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04-28-2024, 06:29 PM | #119 |
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M9 fit Bolts. Torque Spec 11 11 2AZ.
I’m reading it as two steps…8nm and then 130 degrees. This write up, Sarka on the Ring YT Video and m539’s YT Video says to go 8nm, 15mm, and then 130 degrees. I see a discrepancy in step 10d(of this DIY), the Videos and TIS! Can someone one confirm that I’m correct in my interpretation of TIS(Page 306). |
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