Well for me...I need a lot more data input....
But if you 'see a lot of meta shaving'...I would not try to start the engine any more...!
You need to do a lot of "offline" research around the engine and areas that you see
the shavings....possibly getting an experienced Friend to come-N-help you.
It's hard for anyone to help w/the limited info provided....
w/o audio, video clips...being in your shoes.
You may have to finance an experience mechanic to come & do a "complete"
LOOK IN & Inspection.....but be careful of their ego/experience level for their
asking $Price to achieve your assignment.
As a home inspector would do....Have them provide detailed notes of their observation....
My 2 cents....