This comprehensive Mercedes-Benz W123 Workshop Repair Service Manual provides detailed technical information for all models produced from 1976 to 1985. It covers everything from general maintenance and troubleshooting to in-depth engine, transmission, brake, and electrical system repair procedures. You'll find detailed wiring diagrams, step-by-step instructions, and numerous illustrations to guide you through every repair process. The manual is written by the manufacturer, offering the most accurate and complete information available, ensuring you have the best possible resources to service and maintain your W123. This valuable resource includes: - **General Maintenance:** Learn how to perform routine maintenance tasks like oil changes, filter replacements, and fluid checks. - **Troubleshooting:** Diagnose common problems and understand their causes with detailed troubleshooting guides. - **Engine Service & Repair:** Get detailed instructions on repairing, rebuilding, and maintaining all engine types and components, including fuel injection and emissions systems. - **Transmission Service & Repair:** Covering both automatic and manual transmission types, the manual provides comprehensive repair and maintenance procedures for smooth shifting and optimal performance. - **Brake System:** Learn about the various brake system components, their operation, and how to properly maintain and repair them. - **Electrical System:** Includes thorough wiring diagrams, component descriptions, and repair procedures for the entire electrical system, from basic maintenance to advanced troubleshooting. - **Suspension:** Detailed information on suspension components, adjustments, and repair techniques for a smooth and comfortable ride. - **Periodic Lubrication:** Proper lubrication is essential for vehicle longevity. This manual provides guidance on recommended lubrication schedules and procedures. - **Steering:** Understand the steering system's workings, maintenance requirements, and repair procedures for safe and responsive handling. - **Cooling System:** Learn about the cooling system's components, function, and how to ensure optimal performance. - **Fuel Injection & Fuel System:** Get in-depth knowledge about fuel injection systems, components, repair techniques, and maintenance procedures for optimal fuel efficiency and performance. - **Emission System:** This manual provides information on emission control systems, components, troubleshooting guides, and repair procedures to ensure your vehicle meets environmental standards. - **Heater & Air Conditioning:** Understand the operation of the heating and air conditioning systems, and learn how to diagnose and resolve any issues. - **Engine Control System:** This section delves into the electronic engine control system, its components, troubleshooting, and repair procedures. - **Chassis & Body:** Learn about the vehicle's chassis and body, including repair procedures for various components. - **Restraint System:** Information on the restraint system, its components, and how to ensure proper function. - **Interior:** Covers the interior components, maintenance, and repair procedures. - **Differential & Drive:** Detailed information on the differential and drive system, their components, and repair procedures. - **Axle:** Learn about the axle components, their function, and how to perform maintenance and repairs. With this comprehensive manual at your fingertips, you can confidently tackle repair and maintenance tasks, saving money on professional services and gaining valuable knowledge about your Mercedes-Benz W123.

The Mercedes-Benz W123, produced from 1976 to 1985, represents a significant milestone in the history of the German automaker. This mid-size sedan and wagon, initially a replacement for the venerable W114/W115 series, established itself as a paragon of automotive engineering and durability. Known for its robust construction, timeless design, and exceptional build quality, the W123 became a beloved classic, earning the moniker "the Million Mile Mercedes." It offered a wide range of engines, from frugal four-cylinder diesels to powerful six-cylinder gasoline units, all paired with a choice of manual or automatic transmissions. The W123's success can be attributed to its comprehensive approach to automotive design. Comfort was paramount, with spacious interiors featuring plush seats and a plethora of creature comforts. Reliability was another hallmark, thanks to the use of high-quality materials and a meticulous assembly process. The W123 was available in a variety of body styles, including sedans, station wagons, and coupes. Its versatility, combined with its renowned durability, made it a popular choice for families, professionals, and even taxi fleets. The W123's lasting legacy is reflected in its enduring popularity. Today, these cars are highly sought-after by collectors and enthusiasts alike, celebrated for their timeless design, reliable mechanics, and enduring character.