This comprehensive service and repair manual provides detailed instructions for maintaining, servicing, diagnosing, and repairing your Mercedes-Benz W123 Series 200D, 240D, 240TD, 300D, and 300TD vehicles manufactured between 1976 and 1985.

The manual covers every aspect of your car, including engine overhaul and rebuilding, brake systems, sunroof operation, timing belt replacement, troubleshooting and diagnostics, computer diagnostic trouble tree charts, engine performance, front end and alignment procedures and specifications, suspension systems, transmission removal and installation, air conditioning service and capacities, transmission in-car servicing, computer diagnostic codes, firing orders, detailed specifications for every covered model, factory maintenance schedules and charts, serpentine belt routings with diagrams, timing belt service procedures, brake servicing procedures, driving concerns, complete torque specifications, U-joint and CV-joint service procedures, repair procedures, complete wiring diagrams, hundreds of illustrations, and vacuum diagrams.

This manual is not generic repair information. It is vehicle-specific and contains the exact same information that technicians at authorized dealerships use to maintain, service, diagnose, and repair these models.

The step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications will help you confidently tackle any repair project. You can easily print the pages and diagrams you need, eliminating the need for bulky paper manuals. This manual will save you money by empowering you to perform your own repairs.

The Mercedes-Benz W123 Series, produced from 1976 to 1985, represents a significant chapter in the German automaker's history. This mid-size sedan and wagon lineup revolutionized the concept of luxury and durability, offering a level of refinement and longevity previously unseen in the segment. The W123 was available in a wide range of engine options, including gasoline and diesel powerplants. Among the popular diesel variants were the 200D, 240D, 240TD, 300D, and 300TD, each catering to different performance and fuel economy needs. These diesel engines, renowned for their ruggedness and fuel efficiency, became synonymous with the W123's ability to endure the test of time, achieving legendary status for their reliability and longevity.

Beyond their powertrains, the W123 models were distinguished by their robust construction and meticulous attention to detail. The body-on-frame chassis, a hallmark of Mercedes-Benz's engineering philosophy, ensured exceptional rigidity and stability, while the use of high-quality materials and meticulous assembly contributed to the vehicles' enduring strength. The interior, while modest compared to later models, prioritized functionality and comfort, featuring durable upholstery, robust plastics, and simple yet effective instrumentation. The W123's success was not merely due to its technical prowess, but also its timeless elegance. The boxy, yet sophisticated design, with its strong lines and well-proportioned dimensions, resonated with buyers, earning the W123 a reputation as a stylish and sophisticated vehicle that aged gracefully. The W123's influence on automotive design and engineering remains evident today, solidifying its position as a true icon of the automobile industry.