🏷️ Basic Information Identification Make: Mercedes-Benz Model: W116 Model Variant: 280 S, 280 SE Generation Generation Code: First Generation Codes Chassis Code: W116 👋 Introduction Market Position Positioning: Flagship luxury sedan of its era, known for build quality, comfort, and technological advancements Competitive Analysis Competitors: BMW E23 7 Series, Jaguar XJ, Cadillac DeVille Key Features Design Philosophy: Robust construction, sophisticated engineering, emphasis on safety and driver comfort Innovations: One of the first Mercedes-Benz models with Crumple zones, advanced chassis design for its time 📋 Manual Details Coverage Areas Applicable Years: 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980 Page Count Total Pages: Over 10,000 Manual Type Type: Workshop Service Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine: Detailed diagnosis, repair, overhaul, specifications for 2.8L inline-six engines (M110) Fuel System: Fuel injection (Bosch K-Jetronic), fuel pump, lines, filters, troubleshooting Ignition System: Distributor, ignition coils, spark plugs, troubleshooting, timing Transmission: Automatic and Manual transmission overhaul, repair, fluid checks, operation Drivetrain: Driveshaft, differential, rear axle assembly, maintenance and repair Brakes: Hydraulic system, calipers, discs, master cylinder, power assist, ABS (if equipped), adjustments, bleeding Steering: Power steering system, pump, hoses, steering gear, adjustments, troubleshooting Suspension: Front and rear suspension, shock absorbers, springs, control arms, ball joints, bushings, alignment Electrical System: Battery, alternator, starter, wiring diagrams, fuse box, lighting, accessories, troubleshooting Body And Chassis: Body panels, doors, windows, locks, glass, frame, rust repair, interior trim Heating Ventilation Air Conditioning: HVAC system, climate control, A/C compressor, refrigerant, heater core, blower motor Fuel And Emissions: Emissions control systems, catalytic converters (later models), exhaust system components Procedures Included Maintenance: Routine service, fluid changes, filter replacements, lubrication, tune-ups Troubleshooting: System-specific diagnostic procedures, symptom-based troubleshooting guides Repair: Component removal, installation, disassembly, assembly, and repair for all major systems Adjustments: Carburetor/fuel injection adjustments, ignition timing, brake adjustments, suspension alignment Special Tools: Identification and usage of specific Mercedes-Benz service tools Technical Depth Depth: Comprehensive, from basic maintenance to complete engine and transmission rebuilds Detail Level: Step-by-step instructions with detailed explanations and pictorial diagrams Diagrams: Exploded views, wiring schematics, detailed illustrations, and photos Specifications: Factory specifications, torque values, wear limits, tolerances, and fluid capacities 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Printable Resolution: High resolution for clear viewing and printing Binding Type Binding: Not Applicable (Digital PDF) Paper Type Paper: Not Applicable (Digital PDF) Compatibility Os Compatibility: Windows, Mac, Linux OS Requirements Software Requirement: Adobe Reader ⚙️ Engine Specifications Primary Engine Engine Code: M110 Engine Type: DOHC Inline-6 Displacement: 2.8 Liters (2780 cc) Performance Horsepower 280S: 160 PS (158 hp) at 5500 rpm (approx.) Torque 280S: 240 Nm (177 lb-ft) at 4000 rpm (approx.) Horsepower 280Se: 185 PS (182 hp) at 5750 rpm (approx.) (with fuel injection) Torque 280Se: 238 Nm (176 lb-ft) at 4500 rpm (approx.) (with fuel injection) Fuel System Fuel Delivery 280S: Twin Zenith carburetors Fuel Delivery 280Se: Bosch D-Jetronic or K-Jetronic fuel injection Compression Ratio Compression Ratio: 8.0:1 or 8.7:1 (depending on variant and year) 🔧 Transmission Standard Transmission Type 280S: 4-speed Manual Optional Transmission Type Optional: 3-speed Automatic (Mercedes-Benz 4G-Tronic) Features Clutch Type: Dry single-plate (Manual transmission) 📐 Dimensions Exterior Length: Approx. 4960 mm (195.3 in) Width: Approx. 1800 mm (70.9 in) Height: Approx. 1420 mm (55.9 in) Weights Curb Weight 280S Manual: Approx. 1650 kg (3638 lbs) Curb Weight 280Se Auto: Approx. 1750 kg (3858 lbs) 🛡️ Safety Features Ratings Era Safety Standards: Designed to exceed contemporary safety standards of the early to mid-1970s Active Features Brakes: Four-wheel disc brakes with power assistance Steering: Recirculating ball steering with power assist Passive Features Body Structure: Reinforced safety cell, crumple zones (front and rear) Safety Features: Collapsible steering column, padded interior surfaces, safety glass 💡 Technology Features Infotainment Radio: Typically analog or early digital radios, often with cassette players later in the production run Driver Assistance Cruise Control: Optional feature on many models Connectivity Connectivity Era: Limited by modern standards; focused on basic vehicle functions 🔧 Maintenance Service Intervals Oil Change Interval: Consult manual; typically every 5,000-10,000 km (3,000-6,000 miles) or annually Transmission Fluid Interval: Consult manual; typically at 40,000-60,000 km (25,000-37,000 miles) for automatic Spark Plug Replacement: Consult manual; typically every 30,000-50,000 km (18,000-30,000 miles) Fluid Specifications Engine Oil Type: API SF or SG rated multi-viscosity oil (e.g., 10W-40, 20W-50 depending on climate) Engine Oil Capacity: Approx. 7.5 Liters (7.9 US Quarts) Coolant Type: Ethylene glycol-based antifreeze and water mixture (50/50 recommended) Brake Fluid Type: DOT 3 or DOT 4 Power Steering Fluid: Mercedes-Benz Power Steering Fluid or equivalent Dexron III ATF Known Issues Common Problems: Rust in common areas (wheel arches, sills, trunk floor), vacuum hose degradation, K-Jetronic fuel system tuning, aging electrical components, climate control system issues Parts Information Oem Parts Importance: Emphasis on using genuine Mercedes-Benz parts for reliability and correct fitment 📚 Vehicle History...