New engine bearing wear?

[tsifreak]

On a new engine is it true to see some small bearing debris in the oil filter?
From my understanding when the bearings are newly installed they are not perfectly round as the journal they are riding on is?
I have seen this on 2 new engines and the wear found is no longer found after about 1000 miles and 4 oil changes.
Both engines were pre lubed with oil and clearances verified.
Just looking for some truth to this.

 

[ivymike]

peak power.

 

[ZafirOlegof]

As far as I know wear observed in car engines are due to piston movements in first runs. Bearings should not be damaged, or any loose of material from the bearing should not realized.

If particles observed are bigger than the filter that means there is problem in the engine. In that case a metallographic inspection to identify the material composition should be made in order to find where debris is coming. At least this is the normal procedure followed for airplane engines.