Where can you get a manual for overhauling a 1992 BMW 325i engine?

Answer

It may sound silly, but the best option is the dealership. I've seen many manuals for BMW but the manuals at the dealership are the best. Sometimes they are cool and they will let you borrow them, photo copy or let you get just the info you need to write it down. Others will tell you that you just have to buy it.

Look into buying your own Bentley (the brand name, not the car manufacturer) manual. I bought my own for my E36 and it becomes your Holy Grail. www.bavauto.com is where I get all of my stuff. You can also call them if you ever get stuck with a tough problem.