Rod Bearing service done

[kninjak]

Rod bearing service done by Deansbimmer. I am very satisfied with his service n knowledge. Took care of me in 1 days, recommend him for his fair price n patience with questions as many as u have.
Trying to attached some pic so other can see what condition it was in.
Little brief about the car, brought it at 9500 miles in dec 13, i am the second owner car currently is at almost 68k miles, i have never tracked the car just street drive.
I have redline it almost every time i took it for a drive during weekends. Its a week day car for my lady to run house errands n stuff

[Helmsman]

Here a good place to pile'em up OP: https://www.m3post.com/forums/showthread.php?t=1253084

[SAMM3Y]

Are the black specs on the bearings pitting?

[kninjak]

Not sure Deansbimmer can answer that better then me.

[deansbimmer]

Thank you for making the long trip to see us, Rahim! It was a pleasure to be able to service your M3.

Originally Posted by SAMM3Y

Are the black specs on the bearings pitting?

No, the black specs seen in any used bearing sample would be debris embedded into the soft top layer of the bearing (babbit).

The babbit layer is important because being the softest layer it allows debris that could otherwise harm the journal become embedded and cause no harm to the crank journal. It's the first line of defense but also the first layer of the bearing to wear away prematurely due to the excessively tight OEM clearances.

Losing this feature as the bearings age is one reason why it's important to perform this service. As that primary layer of protection has worn away on most of these bearings, the debris in the oil can't be arrested. Since particles won't readily embed into the harder binding layers beneath the babbit, debris can only hope to be pushed out of the oil wedge to be cycled back through and (hopefully) caught in the filter. Sometimes these particles can damage the journal and lead to knocking and total bearing failure. It's one of the reasons why later models with the harder 702/703 bearing shells seem to be more prone to crankshaft damage.

Also one of the reasons it's important in our opinion to go with extra clearance lead/copper bearings like BE.

I made a thread here that can help visualize what's going on: https://www.m3post.com/forums/showthread.php?t=1486113

[SYT_Shadow]

OP, good job choosing deansbimmer to do this service! And good timing as well

[kninjak]

Yes know i am not worried about getting the engine blown so it did bring peace to my mind

[SAMM3Y]

deansbimmer the real deal Holyfield!! Thanks for taking the time to answer that, it makes a lot of sense. I don't see any part numbers in the Babbitt so need to worry too much OP! The joke on Ducati engines used to be metal in the oil was ok, if you can read part numbers you gotta problem!! Cheers

[G80indy]

OP
What were your OCIs
And oil choice?

[kninjak]

7k to 8k miles and always used castrol 10w 60 amd mahle filter

[kninjak]

7k to 8k miles and always used castrol 10w 60 amd mahle filter