Found this in my oil- what is it?!? Bearing related? - MVAgusta.net
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post #1 of 24 (permalink) Old 05-25-2018, 08:50 PM Thread Starter
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Found this in my oil- what is it?!? Bearing related?

Hey,

I drained my oil on my 2006 F4 and found this stuck to the drain plug. It was even more mangled before I straightened it out a bit to get a better look at it.
A few people thought it might be bearing related, but not sure from what part of the engine.

Anyone have ideas?

It's ferrous as it stuck to the magnetic drain plug.

I haven't heard any rattling or other nasty sounds when running the engine. It's been months since I changed the oil so I don't know how long it's been down there.

I will open up the engine but wanted any tips before I do so.

Thank you!
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post #2 of 24 (permalink) Old 05-25-2018, 11:00 PM
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lucky for the magnet!
time to celebrate w a cigar and nice glass of scotch
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post #3 of 24 (permalink) Old 05-26-2018, 04:07 AM
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I had a quick look through the parts diagrams for inside the engine: https://shop.startwintrading.com/en/.../new-folder-30
Can't see what it might be though, very strange.

Was the oil plug magnet covered in a lot of swarf?
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post #4 of 24 (permalink) Old 05-26-2018, 04:13 AM
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Bearing cage......

Looks like its from the main shaft bearing on clutch side page B 67 of the Engine Manual
Pull the clutch and thrust washer, look at the cage....probably will be missing cage pieces and rivets,
There are 2 sides to the cage
2nd choice, CS output bearing behind the CS sprocket, for that remove transmission

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post #5 of 24 (permalink) Old 05-26-2018, 01:31 PM Thread Starter
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Hi,
Thanks for digging around the parts diagram- I was searching though it as well to see whether this piece my be some stand alone part, but I also found nothing alone those lines.
When I drained the oil there was nearly no swarth- super clean overall (other than this big ass mangled piece of metal :-)
Thanks for your help and time!
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post #6 of 24 (permalink) Old 05-26-2018, 01:36 PM Thread Starter
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Hi,

Thank you for your detailed thoughts!

If this is in fact a bearing cage (which so far seems like the most plausible), wouldn't the bearing itself basically have to be ripped open for the cage to tear out and fall to the oil pan? If so, then wouldn't we expect in the very least to see ball bearings in the oil pan? Would I also expect to have heard or felt something when riding it either at the moment it tore apart or after? I have no idea how many rides I have been on since that metal piece fell, but in all my rides I have never heard or felt anything wrong.

Thanks for any more thoughts on this!
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post #7 of 24 (permalink) Old 05-26-2018, 08:07 PM
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Yes, it's a bearing cage. No, you most likely would not notice if the balls didn't come out of the race. Transmission is so easy to take out that you just go for it. Usually this type of cage failure is a result of an over-tightened drive chain.
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post #8 of 24 (permalink) Old 05-26-2018, 10:03 PM
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Quote:
Originally Posted by sleiper1 View Post
...... Usually this type of cage failure is a result of an over-tightened drive chain.
Wrong, the load on the cage is the same regardless of chain tension

Stress risers and vibration break bearing cages

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post #9 of 24 (permalink) Old 05-27-2018, 08:24 AM
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post #10 of 24 (permalink) Old 05-27-2018, 08:29 AM
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NOTE: This is Bruce Meyers responding via Susie as my conduit. You are partly correct, but IMO and experience with rebuilding "plenty" of engines (not just MV), the stress load from an over-tight chain far exceeds normal bearing stress or vibration. When the suspension compresses the sprockets get further apart and the load numbers get huge. I am interested to learn if this was the output sprocket bearing or the clutch shaft bearing.
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