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09-12-2014, 05:19 PM | #441 |
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Where are they located?
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09-12-2014, 08:40 PM | #443 | |
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09-13-2014, 04:13 AM | #444 |
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Given how incredibly thin the lead layer is, there is no copper showing and that this motor has already covered 80K miles - do they look that bad? I see that a couple show a little more wear than the others but this is not an engine that is going to expire any time soon.
Not that the bearing change is not a good piece of preventative maintenance, it is, but this set doesn't suggest everyone should run around in circles wailing that the end is nigh for their M3. Last edited by SenorFunkyPants; 09-13-2014 at 06:38 AM.. |
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09-13-2014, 06:29 AM | #445 |
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Everyone here wants perfect looking bearing even if you have 100k kms. No one is factoring in these things do wear.
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09-13-2014, 06:34 AM | #446 |
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The fear is that after the soft stuff is sacrificed the crank is at risk and then you have a much more expensive job to pull and grind it. Hopefully that would be the next step, but there are also reports of much worse -- entire engines requiring replacement. It is a fear thing. Certainly some of these bearings show premature wear based on the rest of the respective upper or lower bearings. How comfortable are you running your engine to 8400 let alone tracking it or supercharging it if there is a possibility some of the rod bearings have premature wear? Many of us do not like potentially very expensive unknowns and try to prevent them or hedge against them.
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09-13-2014, 07:43 AM | #447 |
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Am I the only one that thinks those bearings looked pretty ok for 80k miles? Have you guys seen what the bearings looks like when an engine fails? It's a lot worse than that...
Last edited by Rupes; 09-13-2014 at 07:51 AM.. |
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09-13-2014, 08:13 AM | #448 |
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Either the top or bottom shell (but not both) for every single bearing shows premature wear. Mine showed premature wear for only 4 maybe 5 of the uppers. But you are correct that we do not know how much longer these bearings would have lasted without causing any issues. Probably a while. Another 40k? However, it would not be unreasonable to expect no premature wear on any bearings at 100k miles.
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09-23-2014, 08:46 PM | #449 |
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Heres the latest report. I want to add that I wasnt so careful for the first 35k miles of my cars life. Running it hard when it was cold, 15k mi oil change intervals, not letting it warm properly, etc etc. After I learned more I let the engine warm up for a good 3-5 minutes and follow the SOP the forum has established with regards to maintenance, etc etc. for the last 45k miles or so.
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09-27-2014, 02:50 PM | #450 |
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Just had a ESS supercharger installed, 2010 6speed manual. Oil changed every 7,500 miles never tracked 31,000 miles on car. Had bearings and rod bolts upgraded when got supercharger installed.
Bearings are in terrible shape for such a low milage car, this is not something people are making up or blowing out of proportion.
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09-28-2014, 05:02 AM | #452 |
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No order to them in this picture, the worst one is marked #8. Not sure if it was top or bottom shell though.
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09-28-2014, 11:07 AM | #453 | |
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09-28-2014, 01:28 PM | #454 |
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I went with the wpc treated bearings, not a coating so doesn't add any more thickness to the bearing.
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09-29-2014, 02:34 AM | #455 | |
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Edit: certainly cylinders #4 and #8 seem to feature more than the others - numbered correctly (and this is far from certain) these would be the cylinders at the back of the engine at the bulkhead furthest from the oil pump. (Cylinders 1-4 on the RHS, 5-8 on the LHS of the engine bay with 1 & 5 at the front IIUC). Last edited by SenorFunkyPants; 09-29-2014 at 05:40 AM.. |
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09-30-2014, 02:36 PM | #456 |
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Another report from a very clean MY08 that was recently in for PPI inspection:
We'll get another report at next oil service to see if results are different.
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10-04-2014, 01:15 PM | #457 |
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Has anyone considered using a video scope of some kind to look inside the engine for signs of wear? It could provide an additional method of detection to oil analysis and just listening for it to make noises.
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10-04-2014, 01:44 PM | #458 |
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How would that work if the bearings wear material are hidden by the crankshaft inside the journals
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10-04-2014, 02:00 PM | #459 |
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10-04-2014, 07:21 PM | #460 |
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Nothing visible. Look at some of the pictures of people doing the job and study connecting rods and bearings. The clearance is about 0.001. No way to see inside there even if you could get to the side, which you cannot because the crank counterweights and neighboring connecting rod are in the way.
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10-21-2014, 09:40 AM | #462 |
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Took me a while but I made it all the way through this thread. I have some questions below.
My motor blew up a few weeks ago. So i'm very aware of the topic currently. Out of all the bearings taken out of cars in this thread 80%+ of them showed excessive wear. Even though i'm getting a brand new engine (without additional warranty), this makes me super nervous. It doesn't appear any of these are the newer non-lead bearings? It doesn't appear that tracking the car has any effect on wear problems? If I don't/can't replace bearings every 50k I shouldn't own this car? We've not seen any photos of bearings from the WPC treated ones after use?
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