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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Help! Potential Future Blown Engine?



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      05-18-2013, 09:14 PM   #1
mrE92
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Help! Potential Future Blown Engine?

Greets,

Long story short, around 46k miles, my engine cuts off while driving to a stop. It was still under warranty so the dealership repaired the issue. I showed the repair write up to a co-worker and he was shocked on the description and said he was surprised my engine did not and have not blown up yet. Nevertheless, I'm at 63k now and I showed a mechanic the repair write up. He was shocked and said my engine should have blown up based on the description.... Please see the write up and let me know your opinion. Now I'm paranoid and dont know if I need to pursue this to protect my future investment. There is no way to find out if there is any internal damage unless the engine is taken apart. HELP!

Much appreciation
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      05-18-2013, 09:48 PM   #2
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Quote:
Originally Posted by mrE92
Greets,

Long story short, around 46k miles, my engine cuts off while driving to a stop. It was still under warranty so the dealership repaired the issue. I showed the repair write up to a co-worker and he was shocked on the description and said he was surprised my engine did not and have not blown up yet. Nevertheless, I'm at 63k now and I showed a mechanic the repair write up. He was shocked and said my engine should have blown up based on the description.... Please see the write up and let me know your opinion. Now I'm paranoid and dont know if I need to pursue this to protect my future investment. There is no way to find out if there is any internal damage unless the engine is taken apart. HELP!

Much appreciation
http://oi43.tinypic.com/5ani47.jpg
What is your question exactly? The report says the tech found your broken vanos bolts in the oil pan.
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      05-18-2013, 09:54 PM   #3
mrE92
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Hey Nate,

Sorry, to clarify, my question is the vano bolts were found in the oil pan, it had to traveled from the top and through my engine..ie. pistons to get to the bottom. How is that even possible without an engine blow out? Thanks!
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      05-18-2013, 10:30 PM   #4
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it doesnt travel to the combustion chamber...i think
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      05-19-2013, 01:28 AM   #5
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No the bolts traveled through the timing case to the pan, not through the combustion chamber.
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      05-19-2013, 01:37 AM   #6
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Bolts traveling through the combustion chamber would have caused a noticeable degradation of performance not only during coasts to a stop but other times as well.
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      05-19-2013, 05:35 AM   #7
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Bolts or bolt heads, would travel the same path as oil returning to the sump from the upper engine, ie: through the drain holes and the timing chain cavity. There was no chance that they would be sucked up through the oil pump as it has a screen on the intake. It *is* lucky that the bolts/bolt heads didn't get caught in any part of the very complicated BMW valvetrain, that would likely have caused damage but not a complete engine failure.
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      05-19-2013, 05:34 PM   #8
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If your mechanic said your engine should be dead because of this you need a new mechanic.
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      05-29-2013, 01:00 PM   #9
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if you had shredded metal flakes in the engine, it wouldn't have even driven 20k miles more. the piston rod bearing would have been spun, your oil pump would have seized or broken apart. these aluminum bolts break. no biggie.
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