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      08-01-2023, 05:08 PM   #1
kburger
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N52N engine seized bottom engine block cracks at four cylinders

Hey addicts. Wife’s 128i seized at 140k miles[ATTACH] No warning. 18 year old was driving. But I pulled the codes after that only code was pedal position sensor which was malfunctioning new pedal assembly fixed it. I’m putting up a couple pics here two piece n52n engine block was cracked at four cylinders under the crank. Pics show outside of block marks. What caused this? Long term heat from oil starvation ? Oil changed did have powdery metal particles in it for like 40k miles. But no codes? To take off the torque converter had to use a breaker bar on crank bolt to turn it and line up bolts at the trans. I showed the pics to guys who are good they have no idea what caused this. [ATTACH]
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      08-09-2023, 05:18 PM   #2
kburger
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I heard these forums are dead now. That’s a shame. I was on e46 fanatics for a decade. That’s how I got 800k on my 2000 323ci.
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      08-09-2023, 09:08 PM   #3
spidertri
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Only time I've seen this before was in 4JawChuck 's engine tear down thread. He had the same cracks in his bed plate.

Did you see the cracks prior to removing the bed plate from the block or only after during an inspection and clean up?
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      08-10-2023, 12:20 AM   #4
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Hi

This section is part of the 1M Coupe sub forum

you're better off posting the 128i section to get answers.
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      08-18-2023, 09:20 AM   #5
kburger
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Quote:
Originally Posted by spidertri View Post
Only time I've seen this before was in 4JawChuck 's engine tear down thread. He had the same cracks in his bed plate.

Did you see the cracks prior to removing the bed plate from the block or only after during an inspection and clean up?
Only during inspection and cleaning by the body shop. They could have been there the whole time I didn’t look at those spots. Kinda stupid I should have. Kburger
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      08-18-2023, 10:19 AM   #6
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Eh, I don't think you should feel bad about not seeing them, who would really think that their bed plate would crack on a motor?

I'm just wondering if the cracks are closed up when it's installed and torqued but when the plate is removed the cracks are able to open up.

Here's the other thread with similar pictures.

https://www.1addicts.com/forums/show....php?t=1993719
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      08-19-2023, 04:52 AM   #7
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Those cracks are a result of the seizing, not the cause. Oil starvation killed the bearings, just like in the thread spidertri linked to. If 18 year old was hooning the car and the oil was low, sump could've been sucking air instead of oil.

https://f30.bimmerpost.com/forums/sh....php?t=1840025
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