Quote: There's certainly a lot of trash in the bearings, but I think some of you are really overlooking the obvious cause of failure. Take a good close look at the wear pattern on those mains and think about it.
Okay,
Boy , I see lots of stuff.
1. Lots of trash in the oil. 2. Uneven wear patterns. 3. Wear at the parting lines. 4. Heat build up burns from lack of oil. 5. Apparent crank contact on all bearings.
Those are the symptems that I see, so what do they mean.
My guess.
Combined issues,
trash in the oil main bearing bores out of round bearing clearences to tight lack of oil flow at some point maybe poor assembly with grit on back of bearings any or all of the above
