Go to www.startekinfo.com -> MB Workshop Resources -> Service Manual Library CD/DVD -> Model 124 Service Library for no cost on-line access to the FSM. There are also FSMs for the 126 and 201 series. Most of the engine section applies across the 60x engine family but make sure you're looking at information for turbo or non-turbo as appropriate. The '82 SD has a 617 engine which is covered in the 126 series FSM.

Sixto
87 300D