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Old 06-04-2013, 11:34 PM   #701
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Yes, thank you.
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Old 06-04-2013, 11:34 PM   #702
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Anyway, there's an S85 in the garage. Tear down coming soon.
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Old 06-05-2013, 11:40 PM   #703
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Old 06-11-2013, 03:05 AM   #704
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EuroCarFan's S85 Engine Tear Down!


As promised, here's the tear down analysis of Tony's old motor that left him stranded on the way to ECFest.

For background see Tony's thread here:
http://www.m5board.com/vbulletin/e60...89k-miles.html

After Tony was told that there were metal shavings in his oil pan, he was left with the sad news that he would need a replacement motor. I offered to inspect the motor to see the extent of the damage and determine if it was rebuildable. After a phone call to go over what exactly the tear down would entail and details on delivery, the motor was picked up from SonicMS in Mountain View, CA and brought over to my garage.


Picking up the motor from SonicMS






Already stripped of many parts...


Oil pan had a small leak from the front due to a hairline crack.




Loaded up into the delivery vehicle along with the SMG trans, which had the mounting tabs broken off.


Dropped off at my garage.



90-degree S85 V10 mounted on the stand.


Noticed some coolant seeping from thermostat housing. This was due to a hardened gasket. Common problem. The gasket fell to pieces when the housing was removed.


Oil pan off. Let's get to work.


The first order of business was to check the oil pump drive for damage. The VANOS oil pump looks normal.




The sprocket for the main oil pump was intact. There were no signs of failure here either.


The bottom end and oil still left in the engine looked fairly clean. Front half:


Back half:


Spot check of #4 rod bearing. The bearing is fairly worn and shows quite a bit of scoring.


That means the oil pump has to come off.


Another sign of trouble: oil pump pickup screen caught some metal shavings:


#1 rod bearing. The first sign of trouble here was that the bearing had turned springy and had to be pried off the crankpin. After it was removed, it was clear that the bearing was severely worn and no longer fit into the rod.




The crank was also scored from metal on metal contact.


The #2 rod bearing was similar (no pic).
This is the #3 rod bearing. It was similar to #4, showing wear and scoring. The #3/4 pair was the least worn pair of bearings in the motor.


#5 and #6 bearings. Severely worn and like the first pair, grabbed the crankpin and wouldn't fit in the big end of the rod anymore.




#7 and #8 bearings. Same story.




The #9 and #10 bearings were by far the worst in the motor. Both bearings were spun.
This is #9 after removing the end cap. The bearing shells rotated so the gap is 90 degrees off.


The #9 bearing and end cap were scorched.


#10 was almost as badly damaged.


And here's a video showing how much play there was in #9.


So the failure is similar to many others we've seen on the board. The good news is that the motor still looks rebuildable, but unfortunately it won't be as simple as replacing the rod bearings.
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Old 06-11-2013, 03:09 AM   #705
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Old 06-11-2013, 03:02 PM   #706
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Do not want S85.
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Old 06-11-2013, 03:34 PM   #707
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Old 06-11-2013, 04:46 PM   #708
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Sounds like a good candidate to rebuild...with the dinan stroker kit 5.8L of mother of god making 611 hp.... just sayin
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Old 06-12-2013, 08:12 AM   #709
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Sounds like a good candidate to rebuild...with the dinan stroker kit 5.7L of mother of god making 630 hp.... just sayin
It he buys another engine, I'd live to source and do just that then drop into 330 w/manny tranny.


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Old 06-12-2013, 08:33 AM   #710
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How on earth did they bust the SMG mounts? Adds to the pain I suppose.

Is the crank salvageable? I've seen where you can have them regrind and smooth out the journals, and then use oversized rod bearings.

I think its time for one of these...

http://www.dinancars.com/shop/D850-1...ne.aspx#page=2

Its only $29,999 with a $20k core charge...

I'm sorry, $27,999... its on sale.
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Old 06-12-2013, 10:35 AM   #711
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Quote:
Originally Posted by hizhinezz View Post
It he buys another engine, I'd live to source and do just that then drop into 330 w/manny tranny.


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His car is already back up and running with another engine so this one is for sale.
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i'd rather be gapless with no bulge
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Old 06-12-2013, 10:40 AM   #712
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Quote:
Originally Posted by tech9018 View Post
How on earth did they bust the SMG mounts? Adds to the pain I suppose.

Is the crank salvageable? I've seen where you can have them regrind and smooth out the journals, and then use oversized rod bearings.

I think its time for one of these...

http://www.dinancars.com/shop/D850-1...ne.aspx#page=2

Its only $29,999 with a $20k core charge...

I'm sorry, $27,999... its on sale.
That trans came with the used replacement motor, which also had a cracked oil pan. I'm assuming it was either from an accident the donor car was in or it happened during shipping.

The crank looks salvageable with a grind and polish. It'll depend on the availability of undersized rod bearings.
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i'd rather be gapless with no bulge
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Old 06-12-2013, 11:21 AM   #713
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Originally Posted by mcr_driver View Post
Sounds like a good candidate to rebuild...with the dinan stroker kit 5.8L of mother of god making 611 hp.... just sayin
Quote:
Originally Posted by tech9018 View Post
How on earth did they bust the SMG mounts? Adds to the pain I suppose.

Is the crank salvageable? I've seen where you can have them regrind and smooth out the journals, and then use oversized rod bearings.

I think its time for one of these...

http://www.dinancars.com/shop/D850-1...ne.aspx#page=2

Its only $29,999 with a $20k core charge...

I'm sorry, $27,999... its on sale.
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Old 06-12-2013, 01:50 PM   #714
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How on earth did they bust the SMG mounts? Adds to the pain I suppose.
Very common on many BMWs for a crash to break the mounting tabs off. I've seen the exact same thing happen on E36 and E46 before.
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Old 06-12-2013, 01:55 PM   #715
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So why do the rod bearings go in the S85? Oil starvation at high RPM?
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Old 06-12-2013, 02:18 PM   #716
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Quote:
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So why do the rod bearings go in the S85? Oil starvation at high RPM?
What it comes down to at the core is loss of oil film on the bearings.
The root cause behind that is unknown, but there may be oil supply issues. The pump still works fine, which is the interesting thing.
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Old 06-12-2013, 02:53 PM   #717
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do you do oil changes? I need my oil changed on my e60 m5
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Old 06-12-2013, 03:10 PM   #718
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do you do oil changes? I need my oil changed on my e60 m5
lol, Jon. -___-
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Old 06-12-2013, 03:17 PM   #719
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lol, jon. -___-


hehe
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Old 06-12-2013, 09:23 PM   #720
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Very common on many BMWs for a crash to break the mounting tabs off. I've seen the exact same thing happen on E36 and E46 before.
Not a flaw, BTW, under normal wear this would be bad, but in a crash keeping a bunch of solid metal bits out of the cabin will save your skin. Many cars will have this designed into them for safety. It sucks if you want to pull a tranny from a wreck though.
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