🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Model Variant: 280CE Coupe, 280E Sedan Production Years Covered: 1976-1985 Codes Chassis Code: W123 👋 Introduction Market Position Vehicle Segment: Mid-size luxury executive car Brand Perception: Known for build quality, durability, and sophisticated engineering Competitive Analysis Competitors: BMW 5 Series (E12/E28), Audi 100, Volvo 240/260 Series, Jaguar XJ6 Key Features Manual Value Proposition: Enables informed discussion with technicians and facilitates DIY repairs, saving significant costs. Manual Accuracy: Vehicle-specific, directly mirroring dealership service information. 📋 Manual Details Coverage Areas Manual Type: Service and Repair Workshop Manual Language: English Format: Digital (PDF) Distribution Method: Download Page Count Estimated Page Count: Extensive (Specific count not provided, but described as comprehensive) 📖 Manual Coverage Systems Covered Engine Mechanical: Full overhaul, diagnostics, component repair Engine Electrical: Ignition, starting, charging systems, sensors, ECUs Emission Control: System operation, diagnosis, component testing Fuel System: Carburetor (Zenith/Stromberg for some markets), fuel injection (Bosch K-Jetronic), fuel pumps, lines Clutch: Disc, pressure plate, release bearing, hydraulic system Manual Transmission: Gearbox overhaul, synchronizers, shifting mechanisms Automatic Transmission: Torque converter, planetary gears, hydraulic control, valve body servicing Driveshaft And Axle: Universal joints, driveshaft balancing, rear axle overhaul, differential Suspension: Front independent suspension, rear independent suspension (multi-link), shock absorbers, springs, bushings Steering: Power steering system, steering box, linkage, column Restraint Systems: Seat belts, pre-tensioners (if applicable for later models), SRS components (if equipped) Brake System: Front and rear disc brakes, hydraulic circuits, ABS (if equipped on later models), parking brake Body Interior Exterior: Body panel repair, trim, upholstery, glass, weatherstripping Body Electrical: Lighting, power windows, central locking, wipers, horn, instrumentation HVAC: Heating, ventilation, air conditioning system diagnosis and repair Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, lubrication Troubleshooting: Diagnostic charts, common fault identification and resolution Repair: Step-by-step instructions for component replacement and repair Diagnostics: Engine, transmission, electrical, and chassis system diagnostics Wiring Schematics: Complete electrical system wiring diagrams Technical Depth Scope: Comprehensive workshop-level repair and maintenance Target Audience: Professional mechanics and experienced DIY enthusiasts Illustration Quality: Diagrams and illustrations included for clarity 📊 Manual Specifications File Format Compatibility: All versions of Windows and Mac Required Software: Adobe PDF Reader Print Quality Printability: All pages are printable Binding Type Binding: N/A (Digital format) Paper Type Paper Type: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Type 280Ce 280E: Inline-6, SOHC Displacement 280Ce 280E: 2.8 Liters (2746 cc) Bore X Stroke 280Ce 280E: 86.0 mm x 78.7 mm Compression Ratio 280Ce 280E: 8.3:1 (typical) Performance Horsepower 280Ce 280E: Approximately 142-160 hp (net, depending on market and specific engine variant) Torque 280Ce 280E: Approximately 177-195 lb-ft (net, depending on market and specific engine variant) Fuel System Fuel Delivery Early Models: Carburetion (e.g., Zenith 35/40 INAT) Fuel Delivery Later Models: Bosch K-Jetronic CIS (Continuous Injection System) Fuel Type: Unleaded gasoline (Octane rating typically 91 RON / 87 AKI) 🔧 Transmission Standard Standard Transmission Type: 4-speed manual transmission Optional Optional Transmission Type: 3-speed or 4-speed automatic transmission (e.g., 3HP22) Features Automatic Transmission Features: Torque converter, hydraulic control, often with 'Economy' and 'Power' modes 📐 Dimensions Exterior Wheelbase: Approx. 2794 mm (110 in) Length: Approx. 4725 mm (186 in) Width: Approx. 1790 mm (70.5 in) Height: Approx. 1430 mm (56.3 in) Weights Curb Weight: Approx. 1400-1500 kg (3086-3307 lbs) 🛡️ Safety Features Ratings Safety Design Philosophy: Engineered with a focus on occupant protection, reflecting Mercedes-Benz's commitment to safety. Active Features Active Safety Features: Four-wheel disc brakes, power-assisted steering, independent suspension for stability Passive Features Passive Safety Features: Reinforced passenger cell, crumple zones, dual-circuit braking system, padded interior surfaces 💡 Technology Features Infotainment Infotainment Systems: Basic analog radio systems (AM/FM), optional cassette player. Later models might have upgraded aftermarket units. Driver Assistance Driver Assistance Features: Power steering, power brakes, cruise control (optional), intermittent wipers. Connectivity Connectivity Features: N/A (no integrated connectivity features in the modern sense). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 7,500 - 10,000 miles (12,000 - 15,000 km) or annually, whichever comes first. Transmission Fluid Change: Automatic: every 30,000-40,000 miles (48,000-64,000 km). Manual: inspect and change as needed. Fluid Specifications Engine Oil Specification: API SF/SG or equivalent, SAE 20W-50 or 10W-40 recommended (refer to manual for specific climate conditions). Coolant Specification: 50/50 mix of Mercedes-Benz approved coolant or equivalent ethylene glycol antifreeze and distilled water. Brake Fluid Specification: DOT 3 or DOT 4 (check manual for specific type and change interval). Power Steering Fluid: Mercedes-Benz Power Steering Fluid or Pentosin CHF 11S (check manual for exact type). Known Issues Common Issues General: Rust susceptibility (especially wheel arches, door bottoms, trunk floor), vacuum line degradation affecting central locking and climate control, aging rubber components (bushings, hoses), electrical connector corrosion. Common Issues Engine: Timing chain wear on high-mileage engines, fuel injection system (K-Jetronic) sensitivity to dirt and air leaks, potential for oil leaks from valve cover and...