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BMW 3-Series (E90 E92) Forum
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OFHG Replace and Engine Seized. No Metal Shavings or Coolant in the Oil
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11-19-2018, 03:25 AM | #67 |
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Seizure due to excessive friction would leave particles in the oil.
But if the engine cannot be rotated then the only other possibility is hydrolock, no? Aside from something jamming something else from moving. The intake manifold has to be elevated or removed so there is another possibility for foreign contaminants to enter. Remove the spark plugs and then rotate the crank. How about the oil cooler lines? Something can fall in there. If improperly tightened/seals not replaced then they can leak. Big air pocket in the cooling system due to improper or no bleeding carried out post repair? |
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11-19-2018, 07:22 AM | #68 | |
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11-19-2018, 06:28 PM | #69 | |
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11-19-2018, 11:31 PM | #70 |
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I'd guess a little fleck of rubber or dirt falls into the oil passage during the gasket change and then by freak chance it flows right into a rod bearing where it clogs the tiny passage. You wouldn't see shavings in the oil because there would be no oil flow to rinse the shavings out. The bearing would suddenly start rubbing and then spin and lock up within a very short time.
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11-21-2018, 10:55 AM | #71 | |
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Is the N55 bottom end different a lot from the N54? They changed the rod bearing design right? Maybe there are now more prone to slight debris like you say. |
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11-21-2018, 11:16 AM | #72 |
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It doesn't happen more often on the N55. There is zero data to indicate that.
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11-21-2018, 11:30 AM | #73 |
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11-21-2018, 12:32 PM | #74 | |
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But its odd that most fails are with 2011 year. Something could be going on here. It def in my opinion, a oil delivery or restriction issue. I dont think the bearings are failing with good oil.(my opinion obv ) Is the N54 oil pump different ? OR the oil passage ? IS the filter housing design different with N54 ? |
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11-21-2018, 01:13 PM | #75 | ||
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Your statement is nonsense, you have no idea how many N54's or N55's were made and you have no idea how many 2011 N55's have failed.
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11-21-2018, 01:22 PM | #76 | |
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Every time I search it's just N55s. And yes forums definitely give you a statistic idea. If there is a lot of posts on the subject it must mean something. It's still going to be somewhat proportional. |
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11-21-2018, 01:53 PM | #77 | |
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11-21-2018, 02:11 PM | #78 | |
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Somewhat proportional? BMW doesn't release model specific sales data but millions of E9X, E8X, E7X, E60, X6, F01, Z4, F2X, F06, F10, F11, F12, F15, F16, and many more, were sold. So the number of models that were equipped with the N54 and N55 is a shit ton so a couple of forum posts about failures that may or may not be related to design flaw in the engine doesn't mean shit. Especially when you consider most of the N55 failures I have seen on this forum have not been on stock cars, but fairly modified and tuned ones and on most the failure mode is mostly a guess as very few have had the engines torn apart and shared the results. Now think of all the models that were equipped with the N54 or N55 in this time period and look at these numbers.
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2015 X5 35i Xdrive Last edited by 9krpmrx8; 11-21-2018 at 03:48 PM.. Reason: spelling |
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11-21-2018, 03:28 PM | #79 |
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11-22-2018, 01:29 AM | #80 |
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I think we can all agree opinions are opinions but how about we don’t turn this thread into a pissing contest. I took good care of my engine (since I bought the car) but it still failed. I may have to have the engine torn down to determine what the cause of failure was because there were no metal shavings in the oil. If that’s the case, I’ll let you what happened.
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11-22-2018, 05:43 AM | #81 |
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11-22-2018, 07:30 AM | #82 | |
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11-23-2018, 07:19 AM | #84 |
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I believe it should be the opposite. The shop messed up in this case. When you do it yourself you can be more careful. I did it twice and its hard to mess up honestly.
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11-23-2018, 09:23 AM | #85 |
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There is no data to indicate there is a trend of any kind.
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11-23-2018, 09:26 AM | #86 | |
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On my 2011 I just did the OFHG because I was replacing all the pulleys and the belt as preventative maintenance. Just take your time and follow the service manual.
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11-23-2018, 11:28 PM | #87 | ||
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11-24-2018, 01:33 PM | #88 |
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There is no statistical evidence of a trend. There are a known handful of outliers who experienced a specific failure. That is not the definition of a trend. We don't have enough data to create even the most rudiamentary of models to suggest any correlation of factors for failure.
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