Hey guys, I finally have an update, took literally 2 months to get something.
So, there's some damage to the crankshaft:
View post on imgur.com
It's not smooth, there's an odd straight line as you can see.
Also, here are the rod bearings that were mounted on that part of the crankshaft:
View post on imgur.com
Something scratched it from the inside, and I have no idea what that could be.
The mechanic said that it could be possible to investigate what happened by opening the engine block, but he'll go through that if he really has to open it.
Also, unfortunately, I didn't get pics of it, but the main bearing (
on the outside part) in the same position shown in the crankshaft pics, looks a bit more "browny", as if it's burnt a little.
As of now, he said that there are two options:
1. Get that part of the crankshaft adjusted, which is I believe smoothing the area involved, and that means the engine will mount bigger rod bearings;
2. Worst case scenario, where the first point isn't doable, we'll change the crankshaft.
He'll be sending the engine on Monday for the first option, so I'll post updates in the next days!