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      08-03-2018, 06:59 AM   #1
Jobe.
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S65 Destruction

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I purchased this engine from a fellow member.

2011 E90 85k miles. He was cruising roughly 70 mph. Realizes that he lost power and the tachometer is at 0. He coasts to the shoulder and tries to restart the vehicle and the starter just clicks. Engine seized.
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      08-03-2018, 08:23 AM   #2
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Ouch! We definitely be seeing more and more mains giving out, but the numbers are stil very low

Was he supercharged?

Last edited by TheRussski; 08-03-2018 at 08:31 AM.
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      08-03-2018, 08:43 AM   #3
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Woah...that looks ugly! Rod shells look better, where they changed at some point Jobe?
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      08-03-2018, 09:30 AM   #4
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Quote:
Originally Posted by TheRussski View Post
Ouch! We definitely be seeing more and more mains giving out, but the numbers are stil very low

Was he supercharged?
No he was not supercharged. He did replace the engine and put a supercharger on the replacement.

I believe he was on the original rod bearings. Engine had factory 702/703 bearings.
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      08-03-2018, 09:34 AM   #5
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I'm so sorry to see that! It is such a shame
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      08-03-2018, 09:37 AM   #6
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Quote:
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I'm so sorry to see that! It is such a shame
It is unfortunate so see failures out of the S65.

I recently read your thread about your engine going boom. Sorry to hear about that.
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      08-03-2018, 09:40 AM   #7
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I feel bad for you guys. Best of luck getting your cars back in action.
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      08-03-2018, 09:40 AM   #8
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Quote:
Originally Posted by Jobe. View Post
It is unfortunate so see failures out of the S65.

I recently read your thread about your engine going boom. Sorry to hear about that.
It is sad. These are such wonderful engines, I hate to see them die.
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      08-03-2018, 09:41 AM   #9
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Ouch
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      08-03-2018, 10:25 AM   #10
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Would be curious to hear about the engine's history, e.g. maintenance, driving style, climate.
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      08-03-2018, 11:22 AM   #11
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Unbelievable just wow terrible this is
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      08-03-2018, 12:23 PM   #12
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More and more mains seem to be going. What's the recommended mileage to change the main bearings?
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      08-03-2018, 01:33 PM   #13
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Quote:
Originally Posted by Redd View Post
More and more mains seem to be going. What's the recommended mileage to change the main bearings?
To service them you have to pull out the engine and itís just not worth it because in labor alone itís around $4k plus you will be putting in stock mains in there and the same problem will come up
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      08-03-2018, 04:07 PM   #14
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what is the root cause for main bearings failure?
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      08-03-2018, 04:12 PM   #15
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Quote:
Originally Posted by dparm View Post
Would be curious to hear about the engine's history, e.g. maintenance, driving style, climate.
as would I.

oil service intervals is what im interested in, also was it tracked?
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      08-03-2018, 04:51 PM   #16
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Quote:
Originally Posted by Honda View Post
what is the root cause for main bearings failure?
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      08-03-2018, 04:57 PM   #17
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Quote:
Originally Posted by Honda View Post
what is the root cause for main bearings failure?
Theory is same as rod bearings. Clearance and tolerance stack. They are in fact made of the same material as the rod bearings.

I always wonder if there is any correlation between the condition of the rbs and the mains. What scares me about your photos is how good the rod bearings look considering the condition of the mains. The rod bearings are worn but not terrible. That one main is so shot. By chance was that #1?

It shows you really cant make much of a judgement call on the condition of the mains based on the condition of the rod bearings.

I changed my rbs. Heres to letting it ride on the mains......
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      08-03-2018, 08:34 PM   #18
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Quote:
Originally Posted by TheRussski View Post
To service them you have to pull out the engine and itís just not worth it because in labor alone itís around $4k plus you will be putting in stock mains in there and the same problem will come up
But the alternative can't be to wait for failure right? Cos when it goes, it does so without warning and takes the entire engine with it. In other cars, main bearing failure is usually preempted by low oil pressure warning. In the S65 it appears not to be the case.
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      08-03-2018, 09:30 PM   #19
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Quote:
Originally Posted by Redd View Post
But the alternative can't be to wait for failure right? Cos when it goes, it does so without warning and takes the entire engine with it. In other cars, main bearing failure is usually preempted by low oil pressure warning. In the S65 it appears not to be the case.
Failure rate for main bearings are very rare on non supercharged cars. I donít think as of yet we should all start to worry about it.
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      08-04-2018, 12:38 PM   #20
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This is a tough one. I would not wait until the motor goes kaboom but its not cheap to address preventively. Can we monitor main bearing wear via oil analysis?

For track people who plan to keep an E46 M3 on track for awhile, it makes sense to keep a fresh spare motor on hand. I plan on annual motor swaps. Its not too bad as far as cost if you keep the internals stock. I plan on doing a basic check - leak down, rod bearing inspection, and look at the combustion chamber/bores with a boroscope.

Kind of harder to justify for an S65 since used motors are still $8kish and I'd be checking the mains too...which means total teardown.
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      08-04-2018, 01:59 PM   #21
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Now THIS is the stuff that keeps me up at night. Like many have done, planning on doing rod bearing replacement soon - BE bearings, ARP bolts. Then to see this, knowing that in spite of my due diligence and preventative maintenance, I might still be kicked in the balls at any moment. I know, there have been very few mains I've seen on here go so far, and you can't live your life in fear. It's just that I want to keep this car till the end of time and I just hate having the main/rod bearings of Damocles swinging above me.
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      08-04-2018, 09:07 PM   #22
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I think this is the opportunity for a stroker kit to go in. #MightAsWellBro 😂
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