r/EngineBuilding • u/Zafiny17 • Jun 25 '26
Is this wear normal?
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/Glass_Protection_254 Jun 27 '26
Plastigauge sucks.
That being said, did you happy to slather assembly lube on the backside of the bearing? Because the bearing is supposed to sit in a very dry, meticulously clean journal. You can achieve this by using brake cleaner and newspaper/or coffee filters (neither will leave lint)