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04-14-2011, 12:54 PM | #23 | |
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Drives: 2011 E90 M3,1994 Euro E36 M3/4
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Exactly what I am talking about!!!! You said your crank and main bearings were changed and the knock persisted. The cause of the knock and the bad bearings you saw out of your old engine were most likely not bad due to the bearings/crank themselves. It is quite possible the main bearing bores were out of round/tapered in your block which would cause bearing wear and noise and is also the reason why it persisted even after the bearings and crank was changed. There are two proper ways to do repair a bearing/crank replacement on an engine diagnosed with bad main bearings. 1)Pull the engine out, put the bedplate back on the engine block, torque it down and then take measurements to verify everything is in spec. All of the new crank journals should also be measured to ensure they are in spec. Finally after this is done the bearings and crank should be installed, all mains should have plastigauge placed on them and the bedplate torqued. Once this is done and all of the measurements are within spec on the plastigauge, block and crank. You can be satisfied everything is ok. If this process is not followed then you are only assuming the block, crank and bearings is within spec. (The same process should be followed for the rod bearings, rods and journals but for the sake of this post I am only speaking about the mains) 2)The engine should be replaced with a complete long block. A long block will have all of the measurements I described above done during assembly so when you get it is "SHOULD" be good to go! To me it seems that every dealer replacing crank and main bearings is not following the proper procedure and myself I would refuse to accept a dealer replacing crank and main bearings on my car without pulling the engine and verifying the block is within specs. |
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04-15-2011, 11:17 PM | #24 | |
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04-16-2011, 10:54 AM | #25 | |
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Thanks BMRLVR for that insight. Never though the problem could be with the block. .
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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04-18-2011, 10:00 AM | #26 |
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is there any connection between premature engine wear and the 16-18K drain intervals?? I always do an oil change out of pocket every 8-9K...
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04-18-2011, 10:11 AM | #27 |
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You can slide new bearings in most engines without removing the block from the car as long as you can get the pan off to get access.
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04-18-2011, 12:31 PM | #29 | |
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I heard the ticking noise as soon as I had my break in oil change (1200 miles). |
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04-18-2011, 06:18 PM | #30 | |
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I've heard that video many times and can MAYBE hear a faint slapping/ticking sound in it, but it's pretty faint. I think my dealer would laugh at me if I brought it in for that. .
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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04-18-2011, 06:28 PM | #31 |
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As the person that filmed the sound, it is not very faint in person. Any tech that has been servicing E9x M3s will know that sound very well. In any case, if anyone wants more context, please feel free to PM me.
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04-18-2011, 09:54 PM | #32 |
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This issue needs to have the crank replaced also. The cranks and bearings up to Nov 2008 need replacing.
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04-19-2011, 10:57 AM | #33 |
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04-24-2011, 02:30 PM | #34 |
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Newbie here, unfortunately, chiming in on a (possibly) related problem. Bought a 2008 M3 Sedan with 28k on the clock and all dealer records since new. Pristine paint & interior, snatched it up on the spot. Though the car was just serviced (oil, included), while driving from work, noticed the car had a very rough idle and reduced power. Service Engine Soon (or something to that effect) light went on, and I headed for the dealership. I will note this is after less than 1 month of ownership, and about 600 miles - just to & from work & 1 road trip about 130 miles each way (no "spirited driving", at all).
Didn't make it. Car died as I crossed an intersection, and I had it towed to the dealership. Service Advisor told me the next day that they found an engine problem and are contacting BMW (N. America?) to know if they will "rebuild or ship out a new engine". All he said when I questioned was that this was likely "some rare defect", but said no more. It has been about a week, and no further reply. I understand the whole buying a used car "risk", but this 'just doesn't feel right', after dropping a good chunk of cash on a fully documented vehicle, putting about 600 miles on it & having all this. I, too, will post any updates, but my guess is that I will be out my M3 for a few months! |
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04-24-2011, 05:05 PM | #35 | |
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This type of issues were exactly the reasons I pushed so hard to get into a 2009 after having the same issue with 2 2008s. |
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04-24-2011, 05:59 PM | #36 |
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Thanks - I am trying to be patient and let "the process" go through its motions, and I hope that they come through and take care of this mess. The dealership has all records on this car (it was sold & traded back in at the same place), but I don't know if an engine teardown will be required before they give the 'green light' one way or the other.
Hopefully, I will take a lesson from all this, and HOPEFULLY, that will be what a great company they are in honoring true failures under warranty. |
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04-24-2011, 06:07 PM | #37 | |
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04-24-2011, 06:28 PM | #38 | |
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04-24-2011, 11:36 PM | #39 |
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The saga continues.
I'm curious about the number of instances where folks had this noise and actually had an engine failure. If I recall, the total number of folks who honestly had the same noise is pretty small, and, aside from an earlier member who mysteriously stopped posting after the engine was shipped to germany, there appear to have been relatively few actual bearing replacements and even fewer actual engine failures. I was one of the first few to notice and post a video describing this problem. At the time I was unable to conjure the BMW dealership goodwill to get multiple replacement cars. But this ticking in my engine utterly disappeared, and I've been driving it without issue for the last 25000 miles. Curious. |
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04-25-2011, 12:12 AM | #40 | |
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04-25-2011, 01:25 AM | #41 | |
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04-25-2011, 01:47 AM | #42 | |
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I've listened to the video posted above which was supposed to point out the bearing noise in question. I did hear the noise, but I wasn't sure what I was hearing. What do you guys hear in the video posted above? Cheers, TX.
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04-25-2011, 01:11 PM | #43 | |
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I will take top end problems any day, vs bottom end! |
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07-11-2013, 11:37 AM | #44 | |
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