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      04-18-2017, 07:38 PM   #1
Dr. Dre
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Change of Mind on Rod Bearings Replacement

As stated before I work in the auto industry. However, I don't have a technical back ground. After having the bearings completed I decided to send pictures of the bearings to friend that works as a Field Tech Rep. He reviewed the pictures and then referenced pictures from Clevite.

The wear on my rod bearings after 85K miles are considered normal by Clevite. The pictures in the PDF look exactly the same how my bearings looked. My friend also stated that the scratch on one of the bearing was due to foreign material. He said, something might have gotten pass the oil filter.

I've attached the PDF. I can't seem to download the pictures of my bearings from my I-Phone. You live and you learn. Probably still a good idea to get it done. Especially with 4liter V8 that revs to 8300rpms.

Bearing Information CL77-3-402 (2).pdf
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      04-18-2017, 08:34 PM   #2
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Can't wait to read the debate on this one.
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      04-18-2017, 09:10 PM   #3
Dr. Dre
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I'm waiting to get flamed. I hope not.
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      04-18-2017, 09:20 PM   #4
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      04-18-2017, 09:23 PM   #5
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Maybe yours were one of the handful of sets that have looked ok. I had major wear patches on only some bearings and copper showing around the parting lines and down some edges at 60k and while I don't think they were about to fail like some that have been posted showing copper in the center of the bearing, I am happy I replaced them.
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      04-19-2017, 01:23 PM   #6
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Garage List
Interesting
Which category do you think the bearings posted here fall into based on appearance?
I think it looks like oil starvation
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      04-19-2017, 02:08 PM   #7
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Like in so many of these threads, none of the information presented here is new. This pdf (or one like it) from clevite has been around on this forum for a while.

In many cases the wear showing on removed stock bearings are nowhere near normal for the mileage.

EDIT: See http://www.m3post.com/forums/showpos...&postcount=164
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      04-20-2017, 11:16 AM   #8
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Just post this in the other gigantic bearing thread. The sheer amount of RB threads on this forum is absolutely atrocious.
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      04-20-2017, 11:23 AM   #9
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Another rod bearing thread. Only one thing comes to mind...

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      04-20-2017, 11:59 AM   #10
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Based on most of the pics I've seen on this site, it looks like, according to Clevite anyway, a combination of oil starvation and foreign particles on the bearing underside.
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      04-20-2017, 11:59 PM   #11
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One of those funny thread, when relatively green people for the forum think they found not yet touched information on the web.. That pdf and many others been pondered to death back in 2011-2012 already. Profile appearances are deceptive, been here myself tens of thousands of posts ago..
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      04-21-2017, 12:12 AM   #12
Dr. Dre
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Quote:
Originally Posted by Aboutcars View Post
One of those funny thread, when relatively green people for the forum think they found not yet touched information on the web.. That pdf and many others been pondered to death back in 2011-2012 already. Profile appearances are deceptive, been here myself tens of thousands of posts ago..
Is that all you do? Go around being a troll.

Last edited by Dr. Dre; 04-21-2017 at 12:26 AM.
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      04-21-2017, 02:23 AM   #13
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Quote:
Originally Posted by Aboutcars View Post
One of those funny thread, when relatively green people for the forum think they found not yet touched information on the web.. That pdf and many others been pondered to death back in 2011-2012 already. Profile appearances are deceptive, been here myself tens of thousands of posts ago..
Signed up on the forum just a couple of month ago and yet been around for years. Earlier signature banned?

Edit: Gotcha Joe..

Last edited by Helmsman; 04-21-2017 at 03:16 AM.
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      04-21-2017, 10:06 AM   #14
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@redpriest has 150k miles on original bearings with 80 track days.


Stop worrying lol
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      04-21-2017, 10:38 AM   #15
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Quote:
Originally Posted by M3 Number 86 View Post
@redpriest has 150k miles on original bearings with 80 track days.

Stop worrying lol
There are enough failed motors to give reason for concern, though the vast majority of these cars seem to be doing just fine thus far. If you are a gambler, the odds are with you that you will be fine on your original bearings. I changed mine when my extended warranty expired, and I am not worrying.
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      04-21-2017, 10:39 AM   #16
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Quote:
Originally Posted by Dr. Dre View Post
I'm waiting to get flamed. I hope not.
Why worry about that? You've got your glock cocked, homies comin' like the Gotti boys.
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      04-21-2017, 11:06 AM   #17
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Imo the bearing issue has absolutely been overblown, but that doesn't mean it isn't real. From the numbers it looks like about 1 in 50 cars may actually fail, but due to the volume of worn bearing pictures here everyone assumes those engines we're on the verge of failure too, and we just don't know if that's true. I spent $2500 on bearing replacement in 2015. The engine popped a year later and I immediately attributed it to the aftermarket bearings failing. It would've ended up as just another bad bearing story had I not pulled apart the engine and found it had nothing to do with bearings. I wonder how many other engines get chalked up as bearing failure that actually failed like mine did? The new engine has oem bearings and I'm leaving them in and running uoa's monthly. I question why more people don't do that rather than jumping into an expensive replacement that, if you pick the wrong mechanic, can cause more problems than it solves. It takes 5 min to pull a couple oz of oil and send it in. That will tell you more than a million pictures on a car forum. For $28 a month, it's great piece of mind for anyone with a 2008-10 model.
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      04-21-2017, 11:31 AM   #18
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Where are the forum moderators? I tried PMing one awhile ago with no response. They should create a rule that forces any new thread with "bearing" in the title to be screened for approval. Subsequently they can create a sticky with the top 5-10 bearing threads for any ongoing discussion. This is the type of thing that ruins a forum experience... or whats left of one.
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      04-21-2017, 11:45 AM   #19
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Or you can just choose not to click and your forum experience will be preserved
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      04-21-2017, 01:47 PM   #20
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Quote:
Originally Posted by pbonsalb View Post
There are enough failed motors to give reason for concern, though the vast majority of these cars seem to be doing just fine thus far. If you are a gambler, the odds are with you that you will be fine on your original bearings. I changed mine when my extended warranty expired, and I am not worrying.

I get it but people get too worked about it. I pretty much sum it up to idiot owners just flooring it as soon as the car is started lol

It's so bad that somebody has a loose bolt on the midpipe and they scream zomg are my rod bearings ok?

how many cases have there been out of how many sold? And if it's 5% of the cars, what is there to worry about?
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      04-21-2017, 02:13 PM   #21
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Quote:
Originally Posted by Doc Oc View Post
The new engine has oem bearings and I'm leaving them in and running uoa's monthly. I question why more people don't do that rather than jumping into an expensive replacement that, if you pick the wrong mechanic, can cause more problems than it solves.
My 2008 had its lead bearings replaced under preventative maintenance by the previous owner. The car was taken to the BMW dealer and replaced using BMWs newer bearings... that was 30k miles ago.

I'm curious to see what the bearings look like now and have often contemplated opening the engine back up... but what for? to replace with BE bearings?

If the forum wants to contribute and use my car as an experiment, I'll gladly take my car in and have the engine opened up.
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      04-21-2017, 02:51 PM   #22
pbonsalb
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Quote:
Originally Posted by M3 Number 86 View Post
I get it but people get too worked about it. I pretty much sum it up to idiot owners just flooring it as soon as the car is started lol
t?
It would be great if the issue was that simple but it's not. Original owner low mileage properly cared for cars have failed.

The total failures thus far are still a small percentage of cars failed. I would guess under 5%. But the vast majority of bearings preventatively changed look excessively worn so I think the failures will trend upwards. Great cars for DIYers to buy and change the bearings on.
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