I assume the 518i was never sold in the U.S., so not many people here will know details.
Maybe you find here something?
bmwboeken
if you find a Bentley repair manual for the E36, that should probably cover this engine, M43
BMW M43 - Wikipedia, the free encyclopedia
also check here
that covers the M43 engine of the 518i
and even has detailed instructions with drawings/pictures
BMW TIS Online • 5' E34 • 518i (M43) Saloon