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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHIMS Ball Bearings, magnetic?
Reported or suspected cause
equally randomly magnetized ball bearings
Reported cause
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Reported cause · Original poster
All I can say is, that a series of failures that almost seemed random were traced to equally randomly magnetized ball bearings.
Leading evidence: 'equally randomly magnetized ball bearings' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'equally randomly magnetized ball bearings' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check ***** in the bearings' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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We're talking full blown mushroom even though I only ran my oil for a max of two hours before changing it.
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Suggestion · Original poster
For those of you who remove IMS bearings that show significant wear, consider checking the ***** in the bearings to see if any of them are magnetic.
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Suggestion
So, using a magnetic oil change screw would help then
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Suggestion · Original poster
Not all of them...and not even all of them in a bearing "set" (a fully constructed bearing & race).
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This is an "out there" kind of post.
For those of you who remove IMS bearings that show significant wear, consider checking the ***** in the bearings to see if any of them are magnetic.
I don't think this is likely, nor explains everything. At best it might be a contributing factor.
However, I was reading this last weekend about some radial aircraft engines that seemed to unpredictably fail (some did--some were fine), all related to a particular ball bearing assembly.
One of the main factors they found was that somewhat randomly, the ***** in the bearings were coming from a manufacturer - magnetized. Initially this would make no difference. But over time, they would attract steel fragments circulating in the oil and be more likely to fail, due to greater wear.
Even if this is happening, there's probably more going on here that includes issues of the seal(s) and losing grease.
But if this could happen in the much more tightly controlled environment of aircraft engines, who knows about bearings from environments that are less well-controlled.
It's worth checking.
Hey James, have them return yours to you and check it out!
maybe one of the reasons its sealed is to prevent contamination thru attraction rather than to allow oil in and out... could lead to asking "is it really a good idea to remove the seal ring on the larger bearings that cannot be removed thru the IMS hole (aka late model cars)
At work our connecting rods are always demagnetized after they're ground. I believe the same is true for the flat tappet cams we grind. Have you ever used an angle grinder on something to find the piece of metal magnetized afterwards? Is this due to friction?
i'm sure there are engineers on this board that can give a better explanation, but it's like the old boy scout trick of taking a piece of ferrous metal, pointing it north, and beating the bejeezus out of it to magnetize it.
http://www.ehow.com/how_2257627_magnetize-hammer.html
All I can say is, that a series of failures that almost seemed random were traced to equally randomly magnetized ball bearings. Not all of them...and not even all of them in a bearing "set" (a fully constructed bearing & race). But the bearings that failed typically had one or more ***** that were somehow magnetized. This would not happen from regular use. They had to have been supplied that way.
Again -- I'm not assuming could account for all IMS-related failures as there still is an issue of motor oil diluting the grease. There are even additional issues of other failures (e.g., cam chain rail) being misdiagnosed as IMS issues.
This is just a low-probability suggestion that when people take out a bearing that shows genuine wear or failure to see if any of the ***** seem to be magnetized.
They probably aren't....but it doesn't cost anything to check.
Yes I do, and my car doesn't even have an Intermediate Shaft!
BTW, if there is ever going to be a Porsche in my garage again, I am 90% certain it won't have an Intermediate Shaft either.
Suddenly my forehead is magantized towards the table top.
You don't have to orient metal towards north before banging it to make it magnetic north and sounth oriented. All you are doing is lining up the iron by banging it so then its magnetic.
If the bearing is randomly rolling around and sticks to one roll plane then it is probably going to align the iron one way or the other. Then the earths magnetics would play with it just like a little magnet. I've seen flaking off bearing particles that were magnatized sooooo.......
Haha, I am a mechanical engineer. But let me run this by some of my friends that paid more attention in class.
And although a magnetic drain plug would not help a sealed baring, they're never a bad idea. I've always ran them in my race motors. In my bikes they would collect a large amount of ferrous particles that the filter couldn't catch. We're talking full blown mushroom even though I only ran my oil for a max of two hours before changing it.
