🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Variants: 280S, 280SE Model Generation: First Generation W123 Production Years Covered By Manual: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Chassis Code: W123 👋 Introduction Market Position Target Audience: Mercedes-Benz W123 owners with basic mechanical skills, independent auto service professionals, and those seeking to better understand their vehicle. Value Proposition: Provides the same information used by authorized dealer service departments, enabling cost savings on maintenance and repairs. Competitive Analysis Uniqueness: Vehicle-specific, not generic. Offers detailed technical data and procedures crucial for maintaining classic Mercedes-Benz vehicles. Key Features Accuracy: Accurate, clear, and concise text combined with illustrations for ease of use. Completeness: Complete and intact, covering all major topics for the specified models and years. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Workshop Included Sections: General Information, Engine Mechanical, Engine Electrical, Emission Control, Fuel System, Clutch, Manual Transaxle, Automatic Transaxle, Driveshaft and Axle, Suspension, Steering, Restraint, Brake System, Body (Interior and Exterior), Body Electrical, Heating, Ventilation, Air Conditioning Page Count Estimated Page Count: Comprehensive (Exact count not specified, but implied to be extensive for full coverage) Manual Type Type: Service and Repair Workshop Manual Language Language: English Format Format: PDF Accessibility: Viewable on PC, Mac, Phones, E-readers (e.g., Kindle) 📖 Manual Coverage Systems Covered Engine Mechanical: Full coverage of engine components, disassembly, assembly, and overhaul. Engine Electrical: Detailed diagrams and troubleshooting for ignition, starting, charging, and sensor systems. Fuel System: In-depth information on fuel injection (Bosch K-Jetronic for SE) and carburetors (for S), fuel pumps, and lines. Transmission: Covers both manual and automatic transmission repair, servicing, and overhaul procedures. Suspension And Steering: Detailed procedures for component replacement, alignment, and system diagnostics. Brakes: Comprehensive coverage of hydraulic systems, components, and ABS (if equipped on later models). Body And Interior: Repair and restoration guidance for both exterior panels and interior trim, including upholstery and dashboard. Electrical Systems: Extensive wiring schematics and troubleshooting for all vehicle electrical components, including lighting, instruments, and accessories. HVAC: Detailed instructions for servicing and repairing the heating, ventilation, and air conditioning systems. Emission Control: Information on emission control systems and associated components relevant to the model years. Procedures Included Maintenance: Step-by-step instructions for routine maintenance tasks like oil changes, filter replacements, and tune-ups. Troubleshooting: Diagnostic guides and procedures to identify and resolve common and uncommon vehicle issues. Repair: Detailed instructions for component removal, repair, and reinstallation for all major vehicle systems. Diagnostics: In-depth diagnostic procedures, including electrical testing and mechanical checks. Technical Depth Depth: Comprehensive, dealer-level technical information suitable for both DIY enthusiasts and professional mechanics. Visuals: Includes diagrams, illustrations, and wiring schematics to aid in understanding and execution of repairs. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely searchable text content within the PDF for quick information retrieval. Print Quality Printability: Fully printable, allowing users to print specific pages for workshop use. Binding Type Binding: Digital (PDF format - no physical binding) Paper Type Paper Type: Not Applicable (Digital format) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder (Petrol) Engine Code Common: M110 Displacement Common: 2.8 Liters (2746 cc) Cylinder Head: DOHC (Double Overhead Camshaft) Performance Horsepower 280S: Approx. 158-160 hp (depending on year and market) Torque 280S: Approx. 220-224 Nm (depending on year and market) Horsepower 280Se: Approx. 180-185 hp (often with fuel injection) Torque 280Se: Approx. 230-235 Nm (often with fuel injection) Fuel System 280S Fuel System: Carbureted (e.g., Solex or Zenith twin-choke) 280Se Fuel System: Fuel Injection (Bosch K-Jetronic CIS) Fuel Type: Unleaded Premium Gasoline (Octane rating specific) 🔧 Transmission Standard Manual Transmission: 4-speed and 5-speed manual transmissions available. Optional Automatic Transmission: 3-speed and 4-speed automatic transmissions (e.g., 3HP22) available. Features Drive Layout: Rear-Wheel Drive (RWD) 📐 Dimensions Exterior Body Styles: Sedan (4-door), Coupe (2-door), Estate/Wagon (T-model), Long Wheelbase Sedan (123.023) Wheelbase Sedan: Approx. 2795 mm (110.0 in) Weights Curb Weight Approx: 1450-1550 kg (3200-3400 lbs), varies by body style and equipment. 🛡️ Safety Features Ratings Historical Safety: Known for robust construction and good crash safety for its era. Features were advanced for the 1970s and early 1980s. Active Features Available Features: Four-wheel disc brakes (on most models), power steering, optional ABS (on later models). Passive Features Construction: Reinforced passenger cell, safety-designed steering column, energy-absorbing interior elements. 💡 Technology Features Infotainment Original Features: Basic analog radio (often Becker), analog gauges, and climate controls. Advanced features were minimal by modern standards. Driver Assistance Available Systems: Power steering, cruise control (optional), and ABS (Anti-lock Braking System) on later models. Connectivity Original Connectivity: None by modern standards; focused on reliable mechanical and electrical systems. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 7,500 - 10,000 miles (12,000 - 15,000 km) or annually, depending on driving conditions and oil used. Tune Up Interval: Spark plugs, distributor cap, rotor, and ignition wires typically...