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12-22-2021, 03:36 PM | #1 |
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Volunteers wanted for a simple experiment on your old tin/alu rod bearing(s)
The little experiment is simply to rub down a portion of an old shell (or shells) using emery paper or sandpaper until either it returns to a silver colour or you expose the copper (and yes they do have copper! See pics below), if rubbing down exposes the silver colour layer then you can stop there.
Use the most worn shell(s), and rub through the middle of the dark patch. Then post a good quality close up photo of it please (not blurred, off colour, too dark or over exposed! ). Why do this? Because some of us want to see if any of the Alu/Tin/Copper bearings have actually worn through their babbitt (top) layer. If they haven't, it'll clean up the Alu/tin layer to return it back to a silver colour, and if it has worn through, you'll clearly see the copper coming through as you rub through the dark patch, the dark patch cleaned off fairly quickly when I did the shell below. It would also be interesting to see if simply polishing them would remove the dark patch. On the shell below you can see on the fringes of where I rubbed it down the dark patch has been 'cleaned' off and it's returned to a silver colour. I carried on going to see how obvious the copper is (as you can see, it is very obvious!), any volunteers don't need to go that far (unfortunately I didn't photo the silver only stage). Thanks to Helmsman for the shell below . Now don't get me wrong, I'm not saying that a large swath of the Alu/Tin bearings are not significantly worn where they shouldn't be (e.g this recent set of shells at just ~25k miles), they are worn way beyond what they should be. And with a good photo, or a close look, you can clearly see the oil retaining micro-grooves are typically completely worn away where the dark patches are, even when their is still a babbitt layer left. But in looking through over 500 pictures of shells recently, a mix of lead/copper and Alu/Tin, I've yet to see a single one of the latter worn through to copper. It seems they don't fare as bad as the lead/copper ones. It would be nice to get some data on that though, hence my request. Hopefully we'll get some volunteers! TIA Thanks to E90M3Ross for this photo - https://drive.google.com/file/d/1T2D...ew?usp=sharing
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. Last edited by Assimilator1; 02-13-2024 at 03:41 PM.. |
05-03-2022, 02:07 PM | #2 |
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Bump, no one interested?
I forgot , I did get one volunteer , thanks to Fezza for this shot, we can clearly see the left shell still had the babbitt layer left. Which number shells were they?
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. Last edited by Assimilator1; 07-09-2023 at 07:11 AM.. |
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04-16-2023, 05:53 AM | #3 |
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*cough* anyone??
Still seeing photos being posted to the rod bearing thread!
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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05-06-2023, 11:26 AM | #5 |
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Excellent! Thank you, merci even
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. Last edited by Assimilator1; 10-31-2023 at 04:35 PM.. |
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07-09-2023, 07:11 AM | #6 |
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Did you get around to doing this?
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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07-09-2023, 08:51 AM | #7 |
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lots of work, then on holidays I haven't forgotten you, I'll do it when I get back
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07-09-2023, 02:41 PM | #8 |
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What are you using to rub down the shell?
I will grab mine when I have a moment and work on one of the bad ones!
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07-10-2023, 02:47 PM | #9 |
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For the rubbing down I just used emery paper, sandpaper will do it too (I thought I mentioned that above.....oh, no I didn't, doh! Must've been thinking of a post elsewhere, I'll update the op).
For polishing I was just thinking of car polish, brass polish would probably do it too. Thanks
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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08-01-2023, 01:47 PM | #10 |
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Sorry for the late response but here it is :
When i sand it the AluTin layer was quite thick |
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08-01-2023, 02:25 PM | #11 |
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No worries, thanks for your effort
Although the idea was to sand off in the middle of the shell, in the middle of the wear patch (as per the op) (I know I didn't solely, but I did that before posting this thread). Nonetheless, it's interesting to see the micro grooves going down to the copper.
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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08-02-2023, 01:59 AM | #12 |
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Ok i'll do it in the middle and post a picture
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08-02-2023, 06:35 AM | #13 | |
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Makes one wonder whether the "microgrooves are worn away" conclusion on a lot of pics needs to be revisited, eh? Could be an illusion from the lighting and/or resolution in some (if not most or all) cases. |
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08-02-2023, 11:39 AM | #14 |
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Yea maybe they're not worn away, but (in many cases at least) they are significantly worn down, perhaps flattened off would be a better way to describe the micro grooves wear?
Nice one, thank you . Once part of the dark patch has been rubbed through (to presumably silver), you can stop at that point.
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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10-31-2023, 04:32 PM | #16 |
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Hardly anyone is responding , so barely any data = no conclusion yet.
But hopefully studntdrivr will be posting some photos soon, and perhaps --Aramis-- could post the extra photo I requested? And SaMaster14 ?
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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11-01-2023, 06:37 AM | #17 | |
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Ps. When its not your own thread. |
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11-01-2023, 09:56 AM | #18 | |
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The reply with a "QUOTE" button is not his friend
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11-01-2023, 04:08 PM | #19 |
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As I said before M power , the default setting is to be notified of a reply to a thread that one has posted to, therefore they should get notification of my reply, here and elsewhere.
But just in case they've unsub'd or turned off notification, I tagged their names, which you both seemed to have missed , that's what the blue box is around those 3 names. e.g Helmsman Hmm, your name ///M-power name seems to stop your name showing in the @ popup list. Maybe manually typing it will work.... ///M Power-Belgium, [edit, yep ]. This should notify both you and Helmsman regardless of your forum sub'd thread notification settings.
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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11-02-2023, 07:09 AM | #20 | |
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But using the Quote Button is much easier...' At least for us .
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11-09-2023, 04:38 PM | #21 |
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Lol, well that's good .
But my point is there's no need to use the quotes (aside from picking out a point or a post), most people will get a notification to a thread reply by a simple post . I don't know why you and Helmsman don't, presumably you must have turned it off? Anyway, let us not sidetrack this thread anymore (aside from my question above).
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Oil analysis for finding wearing rod bearings?. Collation of oil analysis reports with some rod bearing photos for the M3's S65. My categorisation of pulled rod bearings in the rod bearing condition thread. My updated 'Blown engines' list. |
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11-11-2023, 06:39 AM | #22 | |
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