case 850 loader engine

I have an old Case 850 track loader. Just a straight 850. 4 in 1 bucket. Ripper.
How do I know the exact year of the machine? Anywhere to look up serial number? Can’t seem to find a place online to look.

It has a good engine. Just hasn’t been cranked in years. Maybe 4-5k hours on it?
What specific engine does it have?
What else does it fit other than a loader?
Value?
I’m thinking of just parting the machine out.

case 850 loader engine