Pinzgauer d24

[Pinzgauer Imports]

Hello all. First post for me but have been looking for a while. I am by no means a mechanic but I have twisted a few wrenches in my time. I am new to the 1996 Pinzgauer 716.
It seems the engine has developed a little knock and I believe it is an injector based on some of the threads and videos I have seen here.

I figured it would be best to first start and figure out what the engine is exactly.
How do I figure out what one I have so I may figure out a parts list. Any help is appreciated as I want to get this resolved ASAP so I can then move on to the timing belts. They are over on time but not on mileage.