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02-18-2019, 12:20 AM | #419 |
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If only I knew the engine warm up and driving habits of the previous owner of my M3.
If I purchased my M3 new I probably wouldn't deal with replacement RBs.
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02-18-2019, 12:30 AM | #420 |
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You probably still would have to deal with it, the bearing shells see wear everytime you start the motor and oil has to flow into the bearings.
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02-18-2019, 11:51 AM | #421 | |
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Regardless of warmup etc., if your bearings are too tight, then you will need to replace them or risk spinning one of them. Cheers,
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02-18-2019, 12:32 PM | #422 | |
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02-18-2019, 12:41 PM | #423 |
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My previous owner had zero modifications and a bicycle rack installed on the roof. Less than 6000 miles a year. Could be a good or bad thing
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02-18-2019, 12:43 PM | #424 | |
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In addition to every startup, engines with unfavorable tolerance stacking from the factory are hit with the double whammy. Its why we see "babied" engines fail just like those that are tracked. How the engine is treated only speaks to a portion of how the bearings will wear. You can read about how engine bearings work here: http://kingbearings.com/files/Engine..._They_Work.pdf |
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02-18-2019, 01:06 PM | #425 | |
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Yes, the majority of "wear" occurs at startup, because the hydrodynamic bearings are not yet operating under pressure. BUT, on a properly designed engine, that wear is soooooo minuscule that we might as well ignore it. If that were not the case, then my buddies 32 year old E30 city commuter would be a paperweight cause he starts that damn thing at least 10 times every day!! Now, if you drive a cold engine hard right after startup, then that is a recipe for additional wear, and a good hard slap. By no means am I disagreeing with you sir. You know far more about engines than I do. I do think it is important to clarify that the normal startup "wear" would never cause a rod bearing to look like some that have been pulled from S65 engines. The issue with the S65 is that under load, and at higher RPM, the rod bearings are NOT operating as a proper hydrodynamic bearings. Cheers,
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2011 E92 M3 - 6MT, ZCP, ZF LSD, ESS G1, Some other goodies... Last edited by Scharbag; 02-18-2019 at 01:33 PM.. |
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02-18-2019, 01:28 PM | #426 | |
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The fluid bearing in stock S65's is inadequate indeed compared to an M20, but factually the most wear per revolution does still occur during startup. Carry on. |
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02-18-2019, 07:22 PM | #427 | |
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02-18-2019, 08:16 PM | #428 |
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Yes. Inadequate OEM clearances remain inadequate regardless of engine temperature. Extra clearance bearings like BE bring the dimensions back to the industry suggested .001" per journal inch.
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01-22-2020, 04:48 PM | #429 |
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Reviving the thread.
I bought an 2011 M3 with 80k miles and had the brgs replaced, it failed the next day at the track, hole on the side of the block. New bearings ACL w/ 0.0025" clearance and Carrillo rod bolts. waiting to take engine apart to see the issue? Parts or Labor. I was told there is no break in period by the bearing manufacturer. I've seen clearances from .001", 0.0025", and 0.050". What is supposed to be the correct clearance? |
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01-22-2020, 05:28 PM | #430 | |
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01-22-2020, 06:14 PM | #431 |
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Either the rod bearing job was not done right or you already had other issues, like main bearing wear. Given that the failure was a day after the rod bearings were installed, I’d guess the failure was due to the rod bearing job. Could be the bearings were not installed right or the car was not put back together right. Either way, major bummer given that you had just didn’t money to help maintain the car.
Hopefully, the undersized ACL bearings that appear, based on the description, to be added clearance, were not installed by mistake. Deansbimmer write a list a few days ago explaining the ACL bearing options. Last edited by pbonsalb; 01-23-2020 at 06:28 AM.. |
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01-22-2020, 08:03 PM | #432 | |
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01-22-2020, 08:11 PM | #433 | |
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01-22-2020, 08:26 PM | #434 | ||
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The majority of rod bearing changes are done properly and work just fine. And I would argue that there has never been proof of a main bearing failure being caused by a properly installed rod bearing change. Cheers,
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01-23-2020, 12:19 AM | #435 | ||
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01-23-2020, 03:44 AM | #436 | |
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This doesn't sound like a rod bearing issue as such but rather install, still might be a good thing if you posted here as well: https://www.m3post.com/forums/showthread.php?t=786615 Curious to hear about further findings. Good luck! |
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01-23-2020, 06:01 AM | #437 | |
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My point was only that the anxiety remains, even after dropping $3k to alleviate the anxiety. You spend the $ and then have to hope the shop did the install correctly. Would still be in the back of my mind when I drove the car. |
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01-23-2020, 07:26 AM | #438 | |
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I do think their is credence to your opinion above and tend to agree to some extent. Regardless, this is not a cut and dry issue with the s65 and the type of RB, installation process, etc. all play a factor it would appear. We still don't know why some s65s are still running strong on 150-200k miles and some failed sub 50k. It's too bad BMW has never weighed in on the matter to assist their M enthusiasts. |
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01-23-2020, 07:43 AM | #439 | ||
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If you have a tight engine, it will fail sooner than one with proper clearance. Simple physics. Well, not so simple hydrodynamic bearing physics.
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01-23-2020, 02:42 PM | #440 |
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The key for me, if I have them done, will be to find a shop that has performed the job with the specific shells and bolts I choose to go and not had an issue. Going to a well regarded shop or engine builder with a good reputation is all well and good but if they don't have experience with this exact job, I'll look elsewhere. I'll be using someone who has done the job multiple times. I'm in MA and it might mean taking my car down to Jersey to have them done. To me, it'd be worth it.
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