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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > OFHG Replace and Engine Seized. No Metal Shavings or Coolant in the Oil



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      11-13-2018, 10:29 AM   #23
9krpmrx8
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Originally Posted by Pladi View Post
I dont think he has the oil. Its been changed already
When you do an oil change you are not removing all of the old oil, so if it still has a significant amount of coolant in it, then you can get an idea of how much coolant made it into the oil in the first place. Coolant in the oil can cause acids to form that can cause a number of issues.
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      11-13-2018, 11:00 AM   #24
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The same thing happened to me in the same year car bro and my engine is seized..I am taking it to my dads mechanic today to open it up
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      11-13-2018, 11:03 AM   #25
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Originally Posted by Pladi View Post
This is a much possible scenario. We have heard that a few times now that engines breaking after OFHG replacement. I did 2 OFHG replacements on my car. You need to be very careful and clean. You can forget paper towel inside the channels if you are soaking coolant and oil.
Yeah I also changed the oil filter housing gasket and 15 min later engine off it got seized
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      11-13-2018, 12:06 PM   #26
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Quote:
Originally Posted by MartinWake View Post
Yeah I also changed the oil filter housing gasket and 15 min later engine off it got seized
Hey didn't you say the reason it happened was that you money shifted in another thread?

Last edited by TheMidnightNarwhal; 11-13-2018 at 12:12 PM..
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      11-13-2018, 01:00 PM   #27
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Originally Posted by MartinWake View Post
Yeah I also changed the oil filter housing gasket and 15 min later engine off it got seized
See we have heard that before and my take is, if the engine problems start right after the OFHG procedure than something during that procedure must have gone wrong. Because if coolant and oil mix before that point because of a failed gasket then the engine would fail even before the gasket repair.

And for anyone that has done that work knows that the way the oil channel is designed through the housing its very hard to get coolant in it. But its very easy to get oil in the coolant.
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      11-13-2018, 01:24 PM   #28
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I'll see if they still have the oil. It would be nice if an analysis could give enough "proof" to the warranty company that it is the crank or rod bearings that they would okay the fix.
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      11-13-2018, 01:47 PM   #29
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Quote:
Originally Posted by Pladi View Post
See we have heard that before and my take is, if the engine problems start right after the OFHG procedure than something during that procedure must have gone wrong. Because if coolant and oil mix before that point because of a failed gasket then the engine would fail even before the gasket repair.

And for anyone that has done that work knows that the way the oil channel is designed through the housing its very hard to get coolant in it. But its very easy to get oil in the coolant.
Also, oil (40psi minimum) is much higher pressure than coolant (~15psi) at all times. Any breach in the gasket would result in oil PUSHING into coolant passages. It's not as likely the reverse would happen.
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      11-13-2018, 01:50 PM   #30
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But guys if you go with the theory that something small may have been dropped or towel piece left, why would it be more common on N55 engines.

And I did the OFHG and OCHG on my N54 engine and I don't see how you could drop something in there or like forgot some towels?

I am just curious to if anyone has more info.
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      11-13-2018, 01:56 PM   #31
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Quote:
Originally Posted by bbnks2 View Post
Also, oil (40psi minimum) is much higher pressure than coolant (~15psi) at all times. Any breach in the gasket would result in oil PUSHING into coolant passages. It's not as likely the reverse would happen.
Thats exactly it as well. I have though of that before too.
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      11-13-2018, 02:02 PM   #32
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Quote:
Originally Posted by TheMidnightNarwhal View Post
But guys if you go with the theory that something small may have been dropped or towel piece left, why would it be more common on N55 engines.

And I did the OFHG and OCHG on my N54 engine and I don't see how you could drop something in there or like forgot some towels?

I am just curious to if anyone has more info.
Yeah its the same with N55. Maybe leaving the OFH with no oil is causing problems.. idk like temporarily loss of oil until its picked up but i dont see how that would be so catastrophic. I dont know its very hard to say what exactly is happening.
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      11-13-2018, 02:06 PM   #33
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https://www.1addicts.com/forums/show....php?t=1359507

Someone posted this in the spun bearing tracking thread a while back. Pretty much exactly what happened to my car. Got it back, drove ~5 miles, engine seized. Wishing I had brought it to a dealership.
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      11-13-2018, 03:32 PM   #34
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Quote:
Originally Posted by bbnks2 View Post
Also, oil (40psi minimum) is much higher pressure than coolant (~15psi) at all times. Any breach in the gasket would result in oil PUSHING into coolant passages. It's not as likely the reverse would happen.

I had an oil test sample save me on another car when a routine sample revealed that there was coolant in the oil. Upon tear down there was a faulty gasket that allowed coolant to mix with oil. It allowed me to tear down the engine and save major hard parts from damage.
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      11-13-2018, 03:59 PM   #35
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Quote:
Originally Posted by 9krpmrx8 View Post
I had an oil test sample save me on another car when a routine sample revealed that there was coolant in the oil. Upon tear down there was a faulty gasket that allowed coolant to mix with oil. It allowed me to tear down the engine and save major hard parts from damage.
IMO I don't think it saved you from like major major issues. It was just the OFHG no? It's a common issue and just taking a peek in your coolant you know when it needs to be changed, that's how I found out mine.

Plus it's common and leaks everywhere.
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      11-13-2018, 05:00 PM   #36
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Quote:
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IMO I don't think it saved you from like major major issues. It was just the OFHG no? It's a common issue and just taking a peek in your coolant you know when it needs to be changed, that's how I found out mine.

Plus it's common and leaks everywhere.

No it's wasn't the OFHG because it was not on a BMW. Coolant was getting into the combustion chamber. It was a small leak that was sealing once the engine warmed up but it would have gotten worse over time. The point is that pressure argument is invalid because coolant was getting into the combustion chamber and when the engine was cold it was making its way into the oil.
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      11-13-2018, 05:15 PM   #37
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Originally Posted by 9krpmrx8 View Post
No it's wasn't the OFHG because it was not on a BMW. Coolant was getting into the combustion chamber. It was a small leak that was sealing once the engine warmed up but it would have gotten worse over time. The point is that pressure argument is invalid because coolant was getting into the combustion chamber and when the engine was cold it was making its way into the oil.
Oh okok.

But that would be a headgasket issue no? Can't really compare that to OFHG.
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      11-13-2018, 05:31 PM   #38
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Quote:
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Oh okok.

But that would be a headgasket issue no? Can't really compare that to OFHG.
I am not comparing it, I am just saying that coolant can get into the oil and that it can cause serious issues. Others seem to disagree but I am sure they are just guessing and have just never experienced it happen or worked on a car that has had this type of issue.
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      11-13-2018, 08:17 PM   #39
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Quote:
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I am not comparing it, I am just saying that coolant can get into the oil and that it can cause serious issues. Others seem to disagree but I am sure they are just guessing and have just never experienced it happen or worked on a car that has had this type of issue.
Well of course but man, the amount of coolant that gets in via OFHG is minimal and not something that will cause engine damage. Maybe yes after an extreme ammount of miles but usually never happens with OFHG.
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      11-13-2018, 10:15 PM   #40
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Quote:
Originally Posted by bbnks2 View Post
Also, oil (40psi minimum) is much higher pressure than coolant (~15psi) at all times. Any breach in the gasket would result in oil PUSHING into coolant passages. It's not as likely the reverse would happen.
That's not the whole story. First, there are many places that coolant can leak directly into the crankcase which ranges from 0psi to slight vacuum. Second, oil pressure instantly goes to 0 when the engine stops but coolant can remain near max pressure for an hour or more, so even in places where gaskets are separating pressurized oil from pressurized coolant, it's possible for the breach to be small enough that only the low viscosity coolant can pass once the engine is off.
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      11-13-2018, 11:27 PM   #41
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The thing that puzzles me about what happened is there was no indication anything was wrong other than the engine shutting off. No CEL or oil pressure warning. It took a few unsuccessful tries at restarting it (didn’t crank or turn over at all) until the CEL finally came on.
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      11-13-2018, 11:38 PM   #42
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Wouldn't there be signs of problems before seizure? Let's say enough coolant did mix with the oil and the oil broke down. This doesn't happen instantly, neither do engines seize instantly. This thing would've been knocking like crazy before it finally gave up.
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      11-13-2018, 11:59 PM   #43
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Quote:
Originally Posted by TheMidnightNarwhal View Post
Hey didn't you say the reason it happened was that you money shifted in another thread?
It was not a hard money shift the engine kept running for a few more sec after that then at the red light it turned off
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      11-14-2018, 06:22 AM   #44
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It was not a hard money shift the engine kept running for a few more sec after that then at the red light it turned off
Okay but if you had money shifted a few seconds ago how can you not think anymore it's due to that. It surely is related to that.

When had you changed the OFHG?
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