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Old April 25th, 2020, 07:56 AM   #1
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bronze flakes

I decided to chang my oil and clean the oil screen on my 1098 and when I pulled the screen I found 2 very small bronze color flakes the size of pepper, but there was nothing in the oil that was drained. I realize that this usually indicates big end rod bearing failure but my question is, has anyone seen these type of bronze flakes come from somewhere else in the engine? Sorry I don't have picks and the bike has 15k miles with about 1400 of them on the track.
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Old April 25th, 2020, 08:26 AM   #2
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It is very likely the facing coming off the big end bearing shells. Better to pull it out and apart now.
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Old April 27th, 2020, 04:55 PM   #3
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It is very likely the facing coming off the big end bearing shells. Better to pull it out and apart now.
Yeah I agree ,I knew at some point that if I kept tracking it without getting the motor blueprinted that this was a possibility.
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Old April 27th, 2020, 08:09 PM   #4
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Just curious. Take a close look at the pickup tube that is in the centre of the screen assembly. Check for cracks inside in same direction as oil flow. I'm hypothesizing that aerated oil may be the root cause of some of these big end failures. Much like running the engine when on its side does the same thing...
No matter what replace your rod bolts while in there. Even if they look fine. There is also an updated torquing method
I have 6000 km since I rebuilt mine and it runs better than new - worth doing.
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Old April 30th, 2020, 01:13 AM   #5
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Whatever you do, do not run it till you have checked it out. I had that happen at 30,000 km, had a whole stack of bronze flakes in the oil maybe 2-300 of them BUT caught it before the steel shell back touched the crank. Gave the crank a light linish with 0.5 then 0.2 micron polishing tape and rebuilt.
I replaced the rods, the rod with the failed bearing had an offset at the split line of 0.025 mm, no matter how many times I reassembled it. I figure the alignment was incorrect when the rod was bored. Engine has 70000 km on it now and is running sweet as a nut, so my engine build has lasted 10 000 km longer than ducati's, feeling proud.
If you are lucky you will save the crank.
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Old April 30th, 2020, 01:19 AM   #6
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P.S. There is nothing else inside the crankcases that generates bronze coloured flakes.
TO be clear the flakes are more of a copper colour, rather than a yellow brassy colour
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Old April 30th, 2020, 09:49 AM   #7
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Thanks Cheng , I'm in the middle of removing the engine now and hoping the crank didn't get damaged. My biggest question is how to keep it from happening again, from what I understand the rod bearings were too tight from the factory. Because I use the bike at the track I'm told I need to plastiguage the rod bearings to coarse spec , the problem is I can't find any corse specs and the rod bearings only come in 2 sizes.
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Old April 30th, 2020, 11:23 AM   #8
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Only have it in Italien:

Name:  1.bmp
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Size:  1.08 MB
Name:  2.bmp
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Size:  3.18 MB
Name:  3.bmp
Views: 115
Size:  2.66 MB
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Old April 30th, 2020, 07:18 PM   #9
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Thanks Dutch848 , now I just have to try and translate.
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Old May 7th, 2020, 02:51 AM   #10
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Aim for .002" clearance if you want to prevent it happening again.
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Old May 8th, 2020, 02:41 PM   #11
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Aim for .002" clearance if you want to prevent it happening again.
Thanks EL Twin
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Old May 11th, 2020, 02:06 PM   #12
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I finally got this thing apart and the horizontal rod bearing is shot , time to box it up and send it out to ducshop for repair.
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Old May 11th, 2020, 02:21 PM   #13
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You did the right thing and pulled it apart in time. Very repairable!!
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Old May 11th, 2020, 03:13 PM   #14
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You did the right thing and pulled it apart in time. Very repairable!!
Thankfully track day season was delayed because of the corona virus, otherwise I probably would have run it like this without even knowing.
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