🏷️ Basic Information Identification Make: Mercedes-Benz Model: 280E Chassis Code: W123 Model Years Covered: 1976-1985 Variant Covered: 280E (M110 Engine) Codes Engine Code: M110 (2.8L Inline-6) 👋 Introduction Market Position Market Position: The Mercedes-Benz W123 series, particularly the 280E, represented the pinnacle of executive sedan engineering in its era, known for its build quality, durability, and comfort. This manual serves enthusiasts and owners seeking to maintain or restore these classic vehicles. Competitive Analysis Competitive Analysis: Competed with other luxury sedans of the late 1970s and early 1980s, such as BMW 5 Series, Audi 100, and Volvo 240, offering a more refined and robust driving experience, albeit at a higher price point. Key Features Key Features: Reputation for exceptional longevity and build quality, sophisticated engineering for its time, comfortable ride, and a robust yet smooth inline-six engine. Target Audience Target Audience: Mercedes-Benz W123 280E owners, classic car restorers, independent mechanics, and automotive enthusiasts. 📋 Manual Details Coverage Areas Coverage Areas: Comprehensive service, repair, maintenance, troubleshooting, and diagnostics for the Mercedes-Benz W123 280E. Page Count Page Count: Estimated 1000+ pages (typical for comprehensive workshop manuals of this era). Manual Type Manual Type: Service and Repair Shop Manual (Downloadable Digital Format) Language Language: English Format Format: Digital Download (PDF optimized for PC, Mac, Tablets, Smartphones) Usability Usability: Cross-platform compatibility allows access on various devices, ensuring ease of use in the workshop or garage. Update Status Update Status: New & Updated for modern digital devices. 📖 Manual Coverage Systems Covered Systems Covered: Engine Mechanical, Fuel System (Bosch K-Jetronic), Ignition System, Cooling System, Lubrication System, Exhaust System, Transmission (Manual & Automatic), Drivetrain, Suspension (Front & Rear), Steering System, Braking System (ABS Optional), Electrical System (Wiring Diagrams Included), Climate Control, Bodywork & Chassis, Interior Components, HVAC. Procedures Included Procedures Included: Routine maintenance, scheduled servicing, component removal and installation, engine overhaul, transmission overhaul, clutch replacement, brake caliper overhaul, suspension strut replacement, power steering system repair, electrical system troubleshooting, fuel injection system adjustment, emissions control system diagnosis, body repair, interior trim removal, body rust repair techniques. Technical Depth Technical Depth: Professional quality, in-depth coverage suitable for home mechanics and professional technicians. Includes detailed diagrams, step-by-step instructions, torque specifications, and diagnostic procedures. Troubleshooting Troubleshooting: Includes systematic troubleshooting guides for common drivability, electrical, and mechanical issues. Diagnostics Diagnostics: Detailed diagnostic charts for engine performance, fuel system, ignition system, and electrical faults. Electrical Schematics Electrical Schematics: Complete, detailed wiring diagrams for all vehicle systems, essential for troubleshooting electrical faults. Special Tools Special Tools: Lists and describes necessary special tools for specific repair procedures. Body And Chassis Body And Chassis: Repair and maintenance procedures for body panels, frame, and structural components, including rust prevention and repair techniques. 📊 Manual Specifications File Format File Format: Searchable PDF Print Quality Print Quality: High-resolution digital reproduction of original factory manuals. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Content Type Content Type: Factory-authorized technical data, repair procedures, and diagnostic information. ⚙️ Engine Specifications Primary Engine Primary Engine: M110.984 (2.8L, 2746cc) SOHC Inline-6 Performance Horsepower: 177 hp @ 5800 rpm (DIN) Torque: 234 Nm (173 lb-ft) @ 4500 rpm (DIN) Fuel System Fuel System: Bosch D-Jetronic or K-Jetronic mechanical fuel injection Cylinder Head Cylinder Head: Aluminum Alloy Block Material Block Material: Cast Iron Bore X Stroke Bore X Stroke: 86.0 mm x 80.0 mm Compression Ratio Compression Ratio: 8.0:1 or 8.7:1 depending on market and emission standards. Cooling System Cooling System: Water-cooled, thermostatically controlled, belt-driven fan. Lubrication System Lubrication System: Pressurized wet sump system with oil filter. Injection Timing Injection Timing: Specific timing procedures for K-Jetronic system, including cold start enrichment and warm-up regulator settings. Emission Controls Emission Controls: Details on emission control systems relevant to the W123 280E, including air injection or EGR where applicable. Ignition System Type Ignition System Type: Distributor-based, Breaker Points (early) or Electronic Ignition (later). 🔧 Transmission Standard Standard Transmission: 4-speed Manual Transmission Optional Optional Transmission: 4-speed Automatic Transmission (Model 722.1 or 722.3 depending on year) Features Features: Hydraulic clutch actuation (manual), torque converter lock-up (later automatics), robust construction. Rebuild Procedures Rebuild Procedures: Comprehensive instructions for dismantling, inspecting, repairing, and reassembling both manual and automatic transmissions. 📐 Dimensions Exterior Length: Approximately 4725 mm (186.0 in) Width: Approximately 1790 mm (70.5 in) Height: Approximately 1425 mm (56.1 in) Wheelbase: Approximately 2795 mm (110.0 in) Weights Curb Weight: Approximately 1450 kg (3197 lbs) Gross Vehicle Weight: Approximately 1970 kg (4343 lbs) 🛡️ Safety Features Ratings Safety Ratings: Not officially rated by modern standards (e.g., NHTSA, Euro NCAP), but designed with significant structural integrity for its time. Active Features Active Features: Four-wheel disc brakes (ventilated front), optional ABS (Anti-lock Braking System) on later models. Passive Features Passive Features: Reinforced passenger cell, collapsible steering column, laminated front windshield, dual-circuit braking system. Wheel Bolt Pattern Wheel Bolt Pattern: 5 x...