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I'm going to preventatively replace my 72K N55 rod bearings
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06-29-2020, 06:49 AM | #265 | |
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06-29-2020, 08:32 AM | #266 | ||
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06-30-2020, 12:52 PM | #267 | |
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06-30-2020, 02:19 PM | #268 | |
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07-08-2020, 05:21 PM | #269 | ||||
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Thanks in advance. |
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07-08-2020, 05:30 PM | #270 | |
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Overall experience so far I can comment on. For good measure I allowed a 100 mile break in period, and have driven about 600 VERY HARD miles on them after that, which included a 6 hour dyno session with 20+ hits at over 500whp. So far so good, no signs of any issues from them which is to be expected from a high quality bearing. However, I haven't taken a look at the oil yet which will tell the real story. |
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07-08-2020, 06:25 PM | #271 | ||
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09-22-2020, 12:41 PM | #272 |
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I wouldn't replace the rod bearings at 75K miles unless you are in there replacing the oil pan gasket. My N55 with 90K miles had a spun bearing. I polished the rod journal, replaced with new bearing, but the rod knock exists due to the rod journal is out of round. Still debating whether I should replace the crankshaft or replace the engine.
1) should I have to resurface the block and head or just clean them up? last time I replaced the head gasket in my Honda Pilot, I did not machine the surfaces, and the engine still runs as new and no issue since. |
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09-22-2020, 11:00 PM | #273 | |
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09-23-2020, 03:13 PM | #274 | |
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We see alot of 2011 models in here and looks like those models had a very short run oil pressure valve installed. From real oem : 11417622768 Hydraulic valve Supersedes: 11417596899(05/01/2010 — 08/23/2011), nonexchangeable retrospectively 11417584989(09/01/2009 — ) |
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09-23-2020, 06:15 PM | #275 |
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Glene, in two sentences you gave the very reason why I, for one, changed the rod bearings proactively at 65 K miles. Mind you, my ride is a Pure 2, port injection car that rips, and I want it to do so for several years to come.
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09-23-2020, 09:26 PM | #276 |
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spun rod bearing is unlikely due to bearing wear, but due to oil starvation. Replacing rod bearings does not improve the oil flow, so you're back in the same boat.
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09-24-2020, 03:14 AM | #277 |
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So you'd prefer to wait until the inevitable happens before taking any proactive measures such as slightly increased rod bearing crank gap. That is entirely your call on how to deal with this costly ticking time bomb. At this point I feel all I could do is address a known symptom by changing a band aid, as the real cause of said oil starvation is nothing but conjecture.
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09-24-2020, 06:45 AM | #278 | |
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It appears to be of very similar design and function as the VANOS solenoids for the n55, which have been known to "act up" or fail from time to time; these have also seen design and p/n revisions throughout their lifetime. Do you know if the "early n55" valve had any use in any other engines prior to n55? If not, this would be a very interesting find, indeed. Thanks for the post! |
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09-24-2020, 09:48 AM | #279 | |
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As for your question no unfortunately i have not looked at this that deep. |
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09-24-2020, 11:24 AM | #280 |
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fatty335 Pladi
I was looking at the Hydraulic valve just a tiny bit more in detail and here is the timeline. The first model is 11417584989 used since 09/01/2009. This was used initially for (and I guess updated with time by the newer ones): 1' E88 (09/2009 — 10/2013) 1' E82 (09/2009 — 10/2013) 3' E90 LCI (09/2009 — 12/2011) 3' E91 LCI (09/2009 — 05/2012) 3' E92 LCI (11/2008 — 06/2013) 3' E93 LCI (11/2008 — 10/2013) 5' F07 GT (09/2008 — 06/2013) 5' F10 (01/2009 — 06/2013) 5' F11 (02/2009 — 06/2013) X5 E70 LCI (04/2009 — 06/2013) X6 E71 (07/2009 — 06/2014) The prior model got quickly replaced by 11417596899, which is non-exchangeable retrospectively, with another very short use from 05/01/2010 to 08/23/2011. The part is replaced by 11417622768, which began to be used from 03/01/2011 and doesn't have an ending date which probably means it served throughout the remaining of the N55s. I checked the listed dates for each model and it seems that it's only used in N55s.
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09-24-2020, 02:43 PM | #281 | |
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09-24-2020, 02:49 PM | #282 | |
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09-24-2020, 03:29 PM | #283 | |
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Looks like the PN is 12517592529 |
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09-24-2020, 04:30 PM | #284 | |
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Based on the post zim-zim shared, and based on the style of connector and black plastic casing on mine, I have the later valve. I'm a 2011 335i with a build date of 08/11. |
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09-24-2020, 06:26 PM | #285 |
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BTW the article I posted seems to suggest that there’s 60% guarantee that a rod bearing will spin by 100k (kilometers), if the valve is not replaced or disconnected (!). Like with time, the valve wears and its reaction time worsens (no proof just an opinion). I own a 2012 x3 3.5 and a 2013 335i. Both have same looking valves with black casing. The x3 recently hit 95k. I replaced the valve on it for peace of mind.
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09-24-2020, 07:46 PM | #286 | |
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I guess it would be beneficial to remove and bench test this valve on motors that have seized. You might not even have to apply and signal since if the theory is correct when you pull them they should be stuck engaged. Last edited by Pladi; 09-24-2020 at 07:52 PM.. |
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