🏷️ Basic Information Identification Make: Mercedes-Benz Model: 280 CE Chassis Code: W123 Body Style: Coupé (CE designation) Generation Generation Name: First Generation W123 Generation Years: 1976-1985 Codes Engine Code Variant: M110 (2.8L Inline-6) 👋 Introduction Market Position Market Position: The Mercedes-Benz W123 chassis, particularly the 280 CE coupé, represented the pinnacle of luxury, build quality, and engineering in its segment during the late 1970s and early 1980s. It was positioned as a premium grand tourer, blending performance with exceptional comfort and durability, appealing to discerning buyers seeking sophisticated personal transportation. Competitive Analysis Competitive Analysis: Competed against other luxury coupés of the era such as the BMW 6 Series (E24), Jaguar XJ-S, and certain American luxury coupes, offering a distinct combination of German engineering, robust build, and refined styling. The W123 line was renowned for its over-engineered durability, setting it apart from many contemporaries. Key Features Key Features: Legendary Mercedes-Benz build quality and durability, sophisticated styling, powerful and smooth M110 inline-six engine, comfortable and well-appointed interior, advanced safety features for its time, reliable Bosch K-Jetronic fuel injection, and a reputation for longevity. 📋 Manual Details Coverage Areas Coverage Areas: Full Service, Repair, Workshop, Maintenance, Diagnostics, Troubleshooting, Electrical Systems, Mechanical Systems, Bodywork Page Count Page Count: Estimated 1000+ pages (typical for comprehensive factory manuals of this era) Manual Type Manual Type: Factory Service Repair Workshop Manual Language Language: English (likely translated from German factory original) Format Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Systems Covered: Engine Mechanical (M110), Fuel System (Bosch K-Jetronic), Ignition System, Cooling System, Lubrication System, Exhaust System, Clutch, Manual Transmission, Automatic Transmission (optional), Driveshaft, Differential, Suspension (Front & Rear), Steering System, Brakes (Front & Rear Discs), Electrical System (Wiring Diagrams, Components), Climate Control System, Body & Chassis, Interior Trim, Body Panels, Instrumentation, Exterior Lighting, Interior Lighting, Safety Restraints (Seatbelts) Procedures Included Procedures Included: Routine Maintenance (Oil Changes, Fluid Checks, Filter Replacements), Component Removal & Installation, Engine Overhaul, Transmission Rebuilds, Brake System Service, Suspension Component Replacement, Steering System Adjustment, Electrical Troubleshooting, Diagnostic Procedures, Body Panel Repair, HVAC System Servicing, Torque Specifications for all fasteners, Alignment Specifications Technical Depth Technical Depth: Comprehensive; covers basic maintenance to complete engine and transmission rebuilds, detailed electrical system diagnostics and wiring diagrams, and specific procedures for component repair and replacement. 📊 Manual Specifications File Format File Format: Portable Document Format (PDF) Print Quality Print Quality: High-resolution, scanned factory original ensuring clarity of text, diagrams, and illustrations. Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated Inline-6 Engine Code: M110.985 (typically for the 280 CE) Displacement: 2746 cc (2.75 Liters) Bore X Stroke: 86.0 mm x 78.7 mm Compression Ratio: 8.2:1 or 9.0:1 (depending on market and specific variant) Performance Horsepower Ps: 180 PS (132 kW; 178 hp) at 5,800 rpm (DIN) Horsepower Hp: 185 hp (138 kW) at 5,800 rpm (SAE net, depending on variant) Torque Nm: 240 Nm (177 lb-ft) at 4,000 rpm (DIN) Fuel System Fuel Injection System: Bosch K-Jetronic (CIS - Continuous Injection System) Fuel Type: Unleaded Gasoline (91 RON / 87 AKI or higher recommended) Engine Construction Block Material: Cast Iron Cylinder Head Material: Aluminum Alloy Valvetrain: Dual Overhead Camshafts (DOHC), 2 valves per cylinder 🔧 Transmission Standard Standard Transmission: 4-Speed Manual Transmission Optional Optional Transmission: 4-Speed Automatic Transmission (e.g., 4G-TRONIC) Features Transmission Features: Fluid coupling (automatic), torque converter, hydraulic control (automatic), overdrive gear (in some automatic variants). 📐 Dimensions Exterior Length: Approximately 4,725 mm (186.0 in) Width: Approximately 1,790 mm (70.5 in) Height: Approximately 1,420 mm (55.9 in) Wheelbase: Approximately 2,795 mm (110.0 in) Interior Seating Capacity: 5 Passengers Cargo Trunk Volume: Approximately 0.47 m³ (16.6 cu ft) Weights Curb Weight: Approximately 1,450 - 1,550 kg (3,197 - 3,417 lbs), depending on options and transmission 🛡️ Safety Features Ratings Safety Ratings: While official crash test ratings from modern agencies are not available for this era, the W123 was renowned for its robust safety cell, crumple zones, and strong chassis construction, considered class-leading for its time. Active Features Active Features: Four-wheel disc brakes, power-assisted steering, optional ABS (Anti-lock Braking System) on later models. Passive Features Passive Features: Reinforced passenger compartment, energy-absorbing steering column, front and rear crumple zones, laminated windshield, padded interior surfaces, three-point seatbelts (front), dual-circuit braking system. 💡 Technology Features Infotainment Infotainment System: Period-appropriate analog radio, optional cassette player. Focus on build quality and mechanical systems rather than advanced electronics. Driver Assistance Driver Assistance Features: Power steering, four-wheel disc brakes. Optional cruise control on some models. ABS was introduced on later W123 variants. Connectivity Connectivity Features: None in the modern sense. Connectivity was limited to basic antenna connections for the radio. 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 - 10,000 miles (12,000 - 16,000 km) or 12 months, whichever comes first (check...