🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Product Name: Mercedes Benz W123 Complete Workshop Service Repair Manual Codes Chassis Code: W123 Body Styles Covered: Sedan (W123), Coupe (C123), Estate/Station Wagon (S123), Long Wheelbase Sedan (V123) 👋 Introduction Market Position Positioning: The Mercedes-Benz W123 series represented a pinnacle of engineering and build quality in its era, renowned for durability and reliability. Competitive Analysis Competitors: Competed with premium sedans and coupes from brands like BMW (E21, E28), Audi, Volvo, and Jaguar. Key Features Durability: Exceptional longevity, often exceeding 300,000 miles with proper maintenance. Build Quality: Solid construction, robust mechanicals, and a focus on passenger safety. Diesel Engines: Introduction of highly successful and durable diesel engines (OM615, OM616, OM617) known for fuel efficiency and longevity. 📋 Manual Details Coverage Areas Model Years Covered: 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993 Regions Covered: Global (specifications may vary by market) Page Count Estimated Page Count: 1500+ Manual Type Type: Comprehensive Workshop Service and Repair Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine: All gasoline and diesel engines (e.g., M110, M115, M116, OM615, OM616, OM617) Transmission: Manual and Automatic Transmissions Fuel System: Carburetor and Fuel Injection systems (Bosch K-Jetronic, Diesel Injection Pumps) Electrical System: Full electrical schematics, lighting, ignition, starting, charging, accessories Brakes: Hydraulic systems, discs, drums, ABS (where applicable) Suspension: Front and rear suspension, steering system Body And Chassis: Body panel repair, structural components, interior trim, glass replacement Heating And Air Conditioning: HVAC system operation and repair Cooling System: Radiator, water pump, thermostat, fan operation Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, tune-ups Diagnostics: Troubleshooting guides, fault finding for engine, electrical, and mechanical issues Repair: Detailed step-by-step repair procedures for all major components and systems Overhaul: Engine rebuilds, transmission overhauls, differential repairs Installation: Component replacement and installation guides Technical Depth Depth: Complete workshop level, suitable for professional technicians and advanced DIY enthusiasts 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content Printability: Printable pages Print Quality Quality: High-resolution scans for clarity of diagrams and text Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Gasoline Options: 2.0L Inline-4 (M115), 2.3L Inline-4 (M115), 2.5L Inline-5 (M123), 2.8L Inline-6 (M110) Diesel Options: 2.0L Inline-4 Diesel (OM615), 2.2L Inline-4 Diesel (OM615), 2.4L Inline-4 Diesel (OM616), 3.0L Inline-5 Diesel (OM617), 3.0L Inline-5 Turbo Diesel (OM617) Performance Horsepower Range: Approx. 70 hp (OM615 diesel) to 180 hp (M110/M116 variants) Torque Range: Approx. 94 lb-ft (OM615 diesel) to 235 lb-ft (OM617 Turbo Diesel) Fuel System Gasoline Injection: Bosch K-Jetronic (CIS) fuel injection on many models Diesel Injection: Bosch inline fuel injection pumps 🔧 Transmission Standard Standard Transmission Types: 4-speed and 5-speed Manual Transmissions Optional Optional Transmission Types: 3-speed and 4-speed Automatic Transmissions (e.g., 722.1, 722.3) Features Automatic Features: Torque converter, hydraulic control, some models may feature vacuum modulator adjustments. 📐 Dimensions Exterior Wheelbase: Approx. 107.1 inches (Sedan/Coupe), 112.2 inches (Estate/Long Wheelbase) Overall Length: Approx. 187.5 inches (Sedan/Coupe), 195.1 inches (Estate) Weights Curb Weight: Approx. 3,100 - 3,700 lbs (depending on body style and engine) 🛡️ Safety Features Ratings Historic Safety Design: Designed with a strong emphasis on passive safety, featuring a reinforced passenger cell and crumple zones. Active Features Braking System: Standard front disc brakes, rear drum brakes. Optional ABS on later models. Passive Features Airbags: Not standard on early models; optional driver airbag available on later production years. Seatbelts: Standard three-point front seatbelts, lap belts in the rear. 💡 Technology Features Infotainment Audio System: Factory-provided AM/FM radio, often with cassette player. Aftermarket upgrades common. Driver Assistance Cruise Control: Optional on many models, typically a vacuum-operated system. Connectivity Not Applicable: No factory-integrated modern connectivity features like Bluetooth or USB. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,000-5,000 miles or annually, depending on driving conditions and oil type. Major Service: Includes spark plugs, fuel filter, air filter, distributor cap/rotor (gasoline), valve adjustments, transmission service. Fluid Specifications Engine Oil: Refer to manual for specific viscosity (e.g., 10W-40, 15W-40) and API service classification based on engine type (gasoline/diesel) and climate. Transmission Fluid Auto: MB Spec 236.1 (e.g., Dexron III or equivalent). Transmission Fluid Manual: GL-4 gear oil of appropriate viscosity (e.g., 75W-90 or 80W-90). Coolant: Ethylene glycol-based antifreeze (e.g., MB Spec 325.0). Known Issues Common Wear Items: Vacuum leaks (lines, actuators), suspension bushings, ball joints, door seals, engine mounts, climate control flap actuators. Diesel Specific: Glow plug system, injection pump seals, exhaust manifold cracking (OM617). Gasoline Specific: K-Jetronic fuel system complexity, distributor issues, timing chain stretch (M110). 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Mercedes-Benz has a long history of producing durable, reliable, and technologically advanced vehicles. Model Evolution W123 Introduction: Introduced in 1975, the W123 succeeded the W114/W115 ('Stroke Eight') series. The model years...