Each Haynes manual is written for the do-it-yourselfer and provides step-by-step instructions based on a complete disassembly of the vehicle. This hands-on experience provides the reader with specific and detailed instructions for performing everything from basic maintenance and troubleshooting to a complete engine overhaul. The models and model years covered in this title are as follows:
Mercedes-Benz Diesel 123 Series for 200D, 220D, 240D, 240TD, 300D, 300CD, 300TD models, designated W123 Series 4-cyl & 5-cyl inc. turbo-diesel (1976-1985)

This Haynes automotive repair manual includes 700+ photos and the following chapters:

Introduction
Chapter 1: Routine Maintenance
Chapter 2: Part A: Engine
Chapter 2: Part B: General engine overhaul procedures
Chapter 3: Cooling, heating and air conditioning systems
Chapter 4: Part A: Fuel and exhaust systems
Chapter 4: Part B: Turbocharger
Chapter 5: Engine electrical systems
Chapter 6: Emissions control systems
Chapter 7: Manual and automatic transmission
Chapter 8: Clutch and driveline
Chapter 9: Brakes
Chapter 10: Suspension and steering systems
Chapter 11: Body
Chapter 12: Chassis electrical system
Wiring Diagrams