The Mercedes-Benz W123 Service Repair Manual is an indispensable resource for owners and mechanics alike, providing comprehensive information for all model years and engine types. This factory manual offers detailed insights into repair, operation, and diagnostics, ensuring you have the knowledge to tackle any issue with confidence. Dive into the intricacies of the W123 with in-depth guidance on engine overhaul and rebuilding, brake system intricacies, sunroof operation, and essential timing belt replacement procedures. Unravel the complexities of the electrical system with detailed wiring diagrams and troubleshooting tips, empowering you to diagnose and resolve electrical faults. This manual goes beyond basic maintenance, delving into advanced areas like computer diagnostics, engine performance optimization, and front-end alignment procedures. It provides specifications for every model, ensuring you work with the correct information for your specific W123. Gain access to factory maintenance schedules and charts, ensuring your W123 receives the care it deserves. Master the intricacies of serpentine belt routing with clear diagrams, understand the nuances of brake servicing procedures, and troubleshoot driving concerns with confidence. Comprehensive torque specifications, detailed U-joint and CV-joint service procedures, complete wiring diagrams, and hundreds of illustrative images are at your fingertips, making this manual an invaluable tool for any W123 owner or mechanic.

The Mercedes-Benz W123 is a series of mid-size executive cars produced by Mercedes-Benz from 1976 to 1985, succeeding the W114/W115 model range. It was a hallmark of reliability and longevity, becoming a symbol of German engineering prowess. The W123 was offered in a variety of body styles, including sedans, coupes, and wagons, catering to diverse needs and tastes. Powertrain options ranged from economical diesel engines to powerful gasoline units, with various levels of trim and luxury features. The W123's success was attributed to its robust construction, which included a fully galvanized body for exceptional corrosion resistance, renowned for its longevity even in harsh environments. This, combined with its mechanical simplicity and straightforward design, made it a highly reliable vehicle. The W123 was praised for its comfortable ride, spacious interior, and refined handling. Its emphasis on safety was also commendable, featuring a robust passenger cell, crumple zones, and optional safety features like anti-lock brakes. The W123's success made it one of the most popular and enduring Mercedes-Benz models, with millions produced throughout its lifespan. Despite being discontinued in 1985, the W123 continues to be cherished by enthusiasts and admired for its durability, classic styling, and timeless appeal.