Thanks, it make sense. I'm assuming don't take the risk to re-use it...those pits appear to be on the backside outer part of the bearing shells. the crankshaft doesn't contact them there. Or that's how the pic seems to me.
It's like an optical illusion lol. I look at it once and then again it appears to be the inside of the shell. so ignore the first part of my post
As to the question, I have seen similar pits in worn bearings before. Sitting for ages without running can cause corrosion on the surface of the shells.
and the majority of the surface area of the shell is not pitted, so it would take a really long time to wear smooth.
Thank you. I will look what the plastigage shows.. maybe I worry too muchSergP , full engine rebuilds can be daunting. A machine shop would give you an idea of the condition of the crank etc.
Or you could do what I do, and chuck the new standard shells in, torque down, and if the crank turns freely, good enough
Probably not good advice . I have never replaced main bearings in an F engine before.
If the plastigage shows clearance is way off, a crank grind is always an option.