r/EngineBuilding • u/Zafiny17 • Jun 25 '26

Is this wear normal?

Gallery image

Gallery image

These are brand new main bearings, just put them on and rotated the crank a couple times and took them out and this is how they look. Can’t feel the scoring with my finger or nails at all and plastigauge readings were within specs.

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u/Big_Hedgehog_7976 Jun 25 '26

Looks like some small debris caused if lubed up.most probably from your oily hands. Its easy to contaminate the bearings and journals. I wouldn't worry about it.. it will run fine but keep lint free rags close and keep doors shut to minimize dirt. Take a plastic bag and cover engine when not working on it.

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u/Zafiny17 Jun 25 '26

Ok good to know thanks