04-14-2023, 12:29 PM | #89 |
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2015 w/ ~155k miles
Adding to the thread here are my rod bearings. ~115K miles on a 2015.
Last edited by Fin_f80; 04-14-2023 at 12:29 PM.. Reason: spelling |
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04-14-2023, 12:48 PM | #90 |
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If you've already removed them. I mean might as well. But, they're fine.
The internals don't slide on those bearings.Its the oil pressure that creates a layer in between the journals and the bearings. You get most wear at start up. When it's dry. But, once the car is on they dont touch. Even under extreme boost where that force is pushing heavily on those pistons its still not suppose to touch. If your internals are just scraping the bearing like some might imagine you would have seized it a very long time ago. You can't have any metal to metal contact on an engine and survive. It would have thrown a rod out of the block. If you would have left it alone it would have been just fine like all the rest. If you replace with new. I'm sure it will be fine. I get your worry. You're still fine. No need to run down the street with your hair on fire about a problem that does not exist. Used bearings are suppose to look like that. You open up any S55 and will likely look very similar.
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04-14-2023, 02:55 PM | #91 | ||
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Wow. Good question.
Can't imagine it'd matter much, though. Even "hard" bearing materials are pretty soft. Quote:
Source PDF is attached. On page 27 of the doc (page 14 of the PDF): Quote:
It does seem to jive with other things I've heard from other manufacturers, though: don't go hard, and vary load and RPM, for at least a few hundred miles. |
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04-17-2023, 03:20 PM | #92 |
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04-21-2023, 06:19 PM | #93 |
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Dear Mates. I speak after having the disaster. I was running stage 3 kratos turbo, 1.8 bar. Oil pump problem, one bearing hit a rod....
Now replaced bearings with stronger, carillo pistons and arrow rods. 2.0 bar safe and sound |
02-26-2024, 09:24 AM | #95 |
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I'm getting a 4-pin hub installed in a couple weeks, I'm wondering if I should ask them to look at the RB's?
Mainly wondering how much effort it is to inspect them with pan & VCG already off to drill crank? Guessing at that point you may as well replace them though... ~56k miles, '17 M3 6mt, 2nd owner, plan to run E85 tune eventually and keep car long time Last edited by Alpine-F80; 02-26-2024 at 09:38 AM.. |
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02-26-2024, 09:33 AM | #96 | |
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Quote:
If they have they pan off, I can’t imagine it being more than $1k just to do them. I think they have to pull off some stuff to check one, it’s like windage tray or maybe the oil pump also.
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03-02-2024, 12:57 PM | #97 | |
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Quote:
After more reading I’m most likely going to skip the RB’s. With all the high mileage & abused s55s out there it seems like a very low likelihood of failure. I’ll get my shop’s thoughts though |
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03-02-2024, 01:37 PM | #98 |
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I had my crank hub done at 52k miles. It’s been superb since
As you say given the oil pan was off the incremental cost of doing the rod bearings would have been the lowest it could be and given that I plan to keep mine for another 3 years( I test drove a G82 today and didn’t like it all) I would have gotten the rod bearings done had I know how long I plan to keep it. 58k miles now and driving from Stuttgart to Paris and then maybe Barcelona. Stage 2 with dp and 102 Aral fuel in Germany. It really is epic and still such a great daily. I would get them done |
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03-06-2024, 12:08 PM | #99 |
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We did a video on my 130,000 mile M4 for those wondering what the job involves.
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04-10-2024, 04:38 PM | #100 | |
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Quote:
TL;DR seems to be don't worry about rod bearings, unless you're an EXTREMELY cautious individual, or already doing an engine build/rebuild. At 100k+ the bearings seem to have a lot of life left as long as the car has been well maintained. |
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