🏷️ Basic Information Identification Make: Mercedes-Benz Model: 560 SEC Codes Chassis Code: C126 Generation Generation Code: Second Generation (C126) 👋 Introduction Market Position Segment: Luxury Grand Tourer Coupe Competitive Analysis Competitors: BMW 8 Series (E31), Porsche 928 Key Features Design Philosophy: Elegant styling, powerful V8 engine, luxurious interior, advanced engineering for its era. Target Audience Demographic: Affluent individuals seeking a stylish, comfortable, and high-performance personal luxury coupe. 📋 Manual Details Coverage Areas Model Years Covered: 1985, 1986, 1987, 1988, 1989, 1990, 1991 Page Count Estimated Page Count: 1000+ Manual Type Type: Complete Workshop Service Repair Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine (M117, M119), Transmission (Automatic) Chassis: Suspension (Hydropneumatic/Self-Leveling Front, Independent Rear), Steering, Brakes (ABS) Electrical: Wiring Diagrams, ECUs, Lighting, Power Accessories, Ignition System Body: Body Panels, Doors, Windows, Seats, Climate Control (HVAC) Fuel System: Fuel tank, fuel pump, fuel lines, fuel injectors, pressure regulators. Procedures Included Maintenance: Scheduled Maintenance, Oil Changes, Fluid Replacements, Filter Replacements Diagnostics: Troubleshooting Charts, Fault Code Interpretation, Symptom-Based Diagnosis Repair: Engine Overhaul, Transmission Rebuild, Suspension Component Replacement, Brake System Repair, Electrical Component Replacement, Bodywork Repair Disassembly Assembly: Detailed step-by-step instructions for component removal and reinstallation Body And Trim: Interior and exterior trim removal and installation, panel alignment. Technical Depth Depth: Comprehensive from basic maintenance to complete engine and transmission rebuilds, including detailed electrical schematics and diagnostic procedures. Wiring Diagrams: Extensive, detailed electrical wiring diagrams for all systems. 📊 Manual Specifications File Format Compatibility: Compatible with all PC, MAC, Tablets, and Mobile Phones with Adobe Reader. Print Quality Quality: High-resolution scans, suitable for printing individual pages, chapters, or the entire manual. Binding Type Binding: Digital (Downloadable PDF) Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Code: M117 Engine Type: SOHC V8 Displacement: 5.6 Liters (5549 cc) Performance Horsepower: 240 hp @ 4750 rpm (US Spec) Torque: 330 lb-ft @ 3000 rpm (US Spec) Fuel System Fuel Delivery: Bosch KE-Jetronic Fuel Injection Engine Management Ignition System: Electronic Ignition Engine Variant Engine Code Later Years: M119 (32-valve DOHC V8 in later models, though this manual primarily covers M117 for 560 SEC) 🔧 Transmission Standard Type: 4-speed Automatic (722.3) Optional Availability: No manual transmission option available for 560 SEC. Features Transmission Control: Electronic Control Unit (ECU) for gear shifting logic Fluid Specifications Transmission Fluid Type: Mercedes-Benz MB 236.1 or equivalent ATF (e.g., Dexron III) 📐 Dimensions Exterior Length: 196.4 inches (4989 mm) Width: 70.5 inches (1791 mm) Height: 55.7 inches (1415 mm) Weights Curb Weight: 4,200 - 4,400 lbs (1905 - 2000 kg) depending on equipment Wheelbase Wheelbase: 112.2 inches (2850 mm) 🛡️ Safety Features Ratings Crash Test Performance: Designed to high Mercedes-Benz safety standards of the era; specific NHTSA/IIHS ratings for this exact model year range may be limited but generally performed well for its time. Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Optional Acceleration Slip Regulation (ASR) available on later models. Passive Features Airbags: Driver's airbag standard from 1987 model year onwards. Passenger airbag optional. Seat Belts: Pretensioner front seat belts 💡 Technology Features Infotainment Audio System: Premium sound systems, often with Becker or Blaupunkt head units, optional CD changer. Driver Assistance Cruise Control: Standard electronic cruise control. Convenience Climate Control: Automatic climate control (air conditioning and heating) Windows Mirrors: Power windows, power mirrors, heated rear window, optional power antenna. Lighting Headlights: Halogen headlights, often with headlamp washers and wipers. 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles (12,000 km) or annually, whichever comes first. Major Service Interval: Refer to manual for specific interval-based checks (e.g., spark plugs, transmission service). Fluid Specifications Engine Oil Type: SAE 15W-40 or 10W-40 (API SG or higher) - Check manual for specific ambient temperature recommendations. Coolant Type: Glycol-based antifreeze mixture (e.g., MB 325.0) with distilled water. Brake Fluid Type: DOT 4 Known Issues Common Wear Items: Head gasket leaks, aging rubber hoses and mounts, SRS system issues, window regulator failures, fuel distributor issues on KE-Jetronic. Corrosion: Prone to rust in typical areas like wheel wells, rocker panels, and door bottoms. Filter Part Numbers Oil Filter Example: Mann-Filter W108/1 or equivalent Bosch, Mahle. Fluid Capacities Engine Oil Capacity: Approx. 8.5 Quarts (8.0 Liters) with filter change 📚 Vehicle History Brand Heritage Brand Legacy: Mercedes-Benz is renowned for engineering excellence, luxury, and safety. Model Evolution C126 Development: The C126 SEC coupe was based on the W126 S-Class sedan, offering a sportier and more personal luxury interpretation. Production Production Years Global: 1981 - 1991 Manufacturing Location: Sindelfingen, West Germany Sales Figures Total Production C126: Approx. 74,060 units 🏆 Awards & Recognition Recognitions Automotive Press: Consistently praised by automotive journalists for its build quality, performance, and enduring style. Ratings Longevity: Considered a modern classic with excellent long-term durability when properly maintained.