This was supposed to be my DIY S65 engine rebuild post.... fail

2006325i · 12-16-2018, 11:11 PM

Can a mod move this to the engine section?

A few months ago my 2011 M3 locked up during acceleration. The car would restart after a bit of cool down. To make a long story short, the pan was pulled and the #1 rod bearing was found to be spun. I decided to remove the engine and replace the damaged crank and rods.

Engine has 70,020 miles. 2011 model

Engine is on the stand.. Hard work is done

[url=https://flic.kr/p/2ce3cee]S65[
Getting excited.. Everything is smooth so far

S65

Pan off, no debris inside. Looks clean

S65
There is the offender

S65 by [url=https://www.flickr.com/photos/147133240@N07/]

Pull the bedplate and what do we have here.. Surprise!

S65 by

S65 by [url=https://www.flickr.com/photos/147133240@N07/]

A shot of all of the mains

S65 by [url=https://www.flickr.com/photos/147133240@N07/]

Damage to the main bearing journal, what appears to be a hairline crack.

S65 by [url=https://www.flickr.com/photos/147133240@N07/]

Any advice on where to go from here?

StripclubDJ · 12-16-2018, 11:47 PM

You spun a rod bearing AND a main ?

Well that motor is gonna make one nice coffee table now :/
Make sure to replace the oil cooler and flush the lines for the next motor

Sorry this happened to you

amrazM · 12-17-2018, 04:17 AM

See if deansbimmer or Troyjeup can help you but he has a backlog of 50+ cars to build if not new motor.

E92_TYLER · 12-17-2018, 07:56 AM

soooo that 03 cobra on welds tho....

deansbimmer · 12-17-2018, 08:20 AM

Sorry to hear of your misfortune but yes, this is what anyone should expect to see when opening an engine with a spun bearing. Main failures always crack the bearing web like that. Being able to start after a cooldown is another trade mark hint to main failure.

I touched on this in another thread with someone looking for a blown engine to rebuild for fun... It doesn't work out 90% of the time.

Your engine appears to be a main-first failure where the main failed and spun first and the resulting lack of oil to the rods caused them to spin too. Since you can't really hear a main failure there's no indication of trouble until it takes out the rod bearings and they start knocking. It can also work the other way around where the rods fail first and the heat can cause main failure unless the engine is stopped.

2006325i · 12-17-2018, 08:41 AM

Quote:

Originally Posted by deansbimmer

Sorry to hear of your misfortune but yes, this is what anyone should expect to see when opening an engine with a spun bearing. Main failures always crack the bearing web like that. Being able to start after a cooldown is another trade mark hint to main failure.

I touched on this in another thread with someone looking for a blown engine to rebuild for fun... It doesn't work out 90% of the time.

Your engine appears to be a main-first failure where the main failed and spun first and the resulting lack of oil to the rods caused them to spin too. Since you can't really hear a main failure there's no indication of trouble until it takes out the rod bearings and they start knocking. It can also work the other way around where the rods fail first and the heat can cause main failure unless the engine is stopped.

I spoke to you by phone a few weeks ago and you called the main bearing! Could you repair this block? Or have one for sale?

deansbimmer · 12-17-2018, 11:47 AM

Quote:

Originally Posted by 2006325i

I spoke to you by phone a few weeks ago and you called the main bearing! Could you repair this block? Or have one for sale?

Yep it's unfortunately common. I don't have any blocks. Those are the most needed component for these engines. I have pallets of parts to build engines and no blocks to start with.

I've considered experimenting with repairing these but haven't been keeping the dead blocks. If you want to ship it to me I can use it towards the effort.

SYT_Shadow · 12-17-2018, 12:24 PM

the hairline cracks are painful, there goes the block

deansbimmer I thought the block could not be welded due to the high silica content

IanMan · 12-17-2018, 01:11 PM

JB Weld that bitch and send it. ��

deansbimmer · 12-17-2018, 02:19 PM

Quote:

Originally Posted by SYT_Shadow

the hairline cracks are painful, there goes the block

deansbimmer I thought the block could not be welded due to the high silica content

In a perfect world that is correct. For a performance or precision build I would never advise. For an average or budget rebuild I think it would work. These blocks are around 7% silicon content. If you can have matching alloy to fill the weld puddle and don't introduce too much heat, it would be possible. Even standard 4043 rod has around 5-6% silicon but there are other component ratios like magnesium that are off. I've welded holes and other damage in these blocks before with success, just never a main saddle. I'd like to try, and then have it line bored/honed.

Nugget · 12-17-2018, 05:30 PM

This is pretty much exactly what happened to me.
I ended up getting a complete new motor from a wrecker, that block is done.

2006325i · 12-17-2018, 10:50 PM

The amount of carbon build up on the pistons is crazy. Is this typical of the s65? Or could it be related?

12-16-2018, 11:11 PM	#1
2006325i New Member 11 Rep 29 Posts Drives: 2011 BMW M3 Join Date: Apr 2011 Location: Kentucky iTrader: (0)	This was supposed to be my DIY S65 engine rebuild post.... fail Can a mod move this to the engine section? A few months ago my 2011 M3 locked up during acceleration. The car would restart after a bit of cool down. To make a long story short, the pan was pulled and the #1 rod bearing was found to be spun. I decided to remove the engine and replace the damaged crank and rods. Engine has 70,020 miles. 2011 model Engine is on the stand.. Hard work is done [url=https://flic.kr/p/2ce3cee]S65[ Getting excited.. Everything is smooth so far S65 Pan off, no debris inside. Looks clean S65 There is the offender S65 by [url=https://www.flickr.com/photos/147133240@N07/] Pull the bedplate and what do we have here.. Surprise! S65 by S65 by [url=https://www.flickr.com/photos/147133240@N07/] A shot of all of the mains S65 by [url=https://www.flickr.com/photos/147133240@N07/] Damage to the main bearing journal, what appears to be a hairline crack. S65 by [url=https://www.flickr.com/photos/147133240@N07/] Any advice on where to go from here? Last edited by 2006325i; 12-17-2018 at 01:09 AM..
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12-16-2018, 11:47 PM	#2
StripclubDJ Lieutenant Colonel 4100 Rep 1,612 Posts Drives: e92 m3 Join Date: May 2016 Location: calis iTrader: (2)	You spun a rod bearing AND a main ? Well that motor is gonna make one nice coffee table now :/ Make sure to replace the oil cooler and flush the lines for the next motor Sorry this happened to you
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12-17-2018, 04:17 AM	#3
amrazM mTekMods 2139 Rep 2,899 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	See if deansbimmer or Troyjeup can help you but he has a backlog of 50+ cars to build if not new motor.
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12-17-2018, 07:56 AM	#4
E92_TYLER Private First Class 76 Rep 161 Posts Drives: 2009 E92 M3 DCT AW Join Date: Mar 2016 Location: oklahoma iTrader: (0) Garage List 2009 BMW M3 [0.00]	soooo that 03 cobra on welds tho.... __________________ Current: 09' E92 M3 DCT Alpine white / Black Current: 13' F150 Fx4 -daily Past: 04' E55 AMG Fbo, 03' E46 M3 99' E36 M3, 92' 240 RB26 408whp rocketbunny 03' SVT Cobra 481whp, 89' Fox 5.0 lx notch
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12-17-2018, 08:20 AM	#5
deansbimmer BimmerPost Supporting Vendor 3749 Rep 2,907 Posts Drives: 2011 E93 M3 Join Date: Nov 2014 Location: DFW, Texas iTrader: (17) Garage List 1988 BMW M3 [0.00] 2013 BMW M3 [0.00] 2011 X5M [0.00] 2011 BMW M3 [0.00]	Sorry to hear of your misfortune but yes, this is what anyone should expect to see when opening an engine with a spun bearing. Main failures always crack the bearing web like that. Being able to start after a cooldown is another trade mark hint to main failure. I touched on this in another thread with someone looking for a blown engine to rebuild for fun... It doesn't work out 90% of the time. Your engine appears to be a main-first failure where the main failed and spun first and the resulting lack of oil to the rods caused them to spin too. Since you can't really hear a main failure there's no indication of trouble until it takes out the rod bearings and they start knocking. It can also work the other way around where the rods fail first and the heat can cause main failure unless the engine is stopped.
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12-17-2018, 12:24 PM	#8
SYT_Shadow ///M Powered for Life 11480 Rep 10,328 Posts Drives: E90M/E92M/M4GTS/M4GT4/X5M Join Date: Sep 2010 Location: Greenwich, CT iTrader: (2)	the hairline cracks are painful, there goes the block deansbimmer I thought the block could not be welded due to the high silica content __________________ DIY: S65 Rod Bearings E9X PFC Z54 BBK on F8X BK harness bar + seats: fit 6 tires in an M3 do88 Cooling Goodies GTS Twins: GTMore project
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12-17-2018, 05:30 PM	#11
Nugget Colonel 650 Rep 2,601 Posts Drives: G81 M3 Touring, GR Supra GTS Join Date: Jan 2012 Location: Perth iTrader: (2) Garage List 2011 BMW 135i [10.00]	This is pretty much exactly what happened to me. I ended up getting a complete new motor from a wrecker, that block is done.
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12-17-2018, 10:50 PM	#12
2006325i New Member 11 Rep 29 Posts Drives: 2011 BMW M3 Join Date: Apr 2011 Location: Kentucky iTrader: (0)	The amount of carbon build up on the pistons is crazy. Is this typical of the s65? Or could it be related?
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