🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEC Model Code: W126 Body Style: Coupe (C126) Generation Generation Code: 1st Generation Codes Chassis Code: C126 👋 Introduction Market Position Target Audience: Mercedes-Benz W126 SEC owners, independent repair shops, DIY enthusiasts Competitive Analysis Advantage: Vehicle-specific, factory-authorized content, comprehensive A-Z coverage Key Features Convenience: All-in-one PDF, printable pages, no greasy pages Information Richness: Step-by-step instructions, diagrams, illustrations, wiring schematics, specifications 📋 Manual Details Coverage Areas Years Covered: 1979-1992 Models Covered: All W126 SEC models Page Count Page Count Estimate: Extensive (exact count not provided, but described as comprehensive A-Z) Manual Type Manual Type: Service and Repair Manual Language Language: English Format Format: PDF Delivery Method: Speed Download 📖 Manual Coverage Systems Covered Engine: Yes, comprehensive engine service, diagnostics, and repair Control System: Yes, detailed coverage Mechanical: Yes, extensive mechanical procedures Fuel System: Yes, including service specifications Emission Control: Yes Cooling System: Yes Lubrication System: Yes Ignition System: Yes Starting Charging: Yes Automatic Transmission: Yes Manual Transmission: Yes Clutch: Yes Drivetrain: Yes, including transfer, propeller shaft, drive shaft, differential, axle Suspension: Yes Wheels Tires: Yes Brake System: Yes, including control and parking brake Steering System: Yes, including column and power steering Climate Control: Yes, including Air Conditioning Restraint Systems: Yes, including Supplemental Restraint System (SRS) and Seat Belts Security Systems: Yes, including Engine Immobilizer Cruise Control: Yes Wipers Washers: Yes Door Locks: Yes Interior Electronics: Yes, including Meter, Audio/Visual, Horn, Instrument Panel Glass Mirrors: Yes, including Windshield/Glass Mirror Body: Yes, including Engine Hood/Door, Exterior & Interior Electrical System: Yes, comprehensive electrical schematics Multiplex Communication: Yes, including CAN Communication (if applicable to later models in the range) Procedures Included Maintenance: Yes, routine maintenance procedures Diagnostics: Yes, troubleshooting and diagnostic steps Repair: Yes, step-by-step repair instructions for all systems Troubleshooting: Yes, detailed troubleshooting guides Wiring Schematics: Yes, comprehensive wiring diagrams included Technical Depth Depth: Vehicle Specific - Factory Detailed Accuracy: Exact same manual used by dealership technicians 📊 Manual Specifications File Format File Type: PDF Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac Requirements: Adobe PDF Reader, Winzip (free online) Print Quality Printability: Yes, all pages printable Image Scaling: Yes, ability to blow up images for enlarged copies Binding Type Binding Type: Digital (PDF) - no physical binding Paper Type Paper Type: N/A (Digital File) ⚙️ Engine Specifications Primary Engine Engine Family: Mercedes-Benz M116/M117 V8 (various displacements) Engine Configuration: V8 Fuel System: Bosch K-Jetronic (CIS) Fuel Injection (likely for most models in this range) Performance Typical Displacement: 3.8L, 4.2L, 5.0L, 5.6L (depending on specific SEC model) Horsepower Range: Approx. 180-270 hp (varies by engine and year) Torque Range: Approx. 220-320 lb-ft (varies by engine and year) 🔧 Transmission Standard Transmission Type: 4-speed Automatic (e.g., 4G-TRONIC) Optional Manual Transmission Availability: Extremely rare or not offered on SEC models Features Automatic Features: Selectable modes (e.g., Comfort/Sport) on some later models 📐 Dimensions Exterior Body Style: 2-door Coupe (C126) Wheelbase: 2896 mm (114.0 inches) Length: 4960 mm (195.3 inches) Width: 1800 mm (70.9 inches) Height: 1380 mm (54.3 inches) Weights Curb Weight Range: Approx. 1750-1900 kg (3858-4189 lbs) 🛡️ Safety Features Ratings Safety Ratings Era: Modern safety standards for its time, including robust body structure Passive Features Airbags: Driver airbag became standard later in the production run Seat Belts: 3-point inertia-reel seat belts Crumple Zones: Yes, front and rear crumple zones Active Features ABS: Anti-lock Braking System (ABS) available/standard on later models 💡 Technology Features Infotainment Audio System: Factory radio/cassette player, often with premium sound options Instrumentation: Classic analog gauges, trip computer on some models Driver Assistance Cruise Control: Standard or optional depending on model year Connectivity Connectivity Features: Limited by era; no modern Bluetooth or USB integration 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-10,000 miles or annually, depending on usage and oil type. Major Service Interval: Varies, but comprehensive checks at 30,000, 60,000, etc., often including spark plugs, filters, and fluid flushes. Fluid Specifications Engine Oil: API SG or higher, viscosity typically 10W-40 or 15W-40 (refer to manual for specific year/engine) Transmission Fluid: MB 236.1 (ATF Dexron II) Coolant: Mercedes-Benz G48 (Blue) or equivalent Ethylene Glycol based antifreeze Known Issues Common Wear Items: Fuel pressure regulator, vacuum lines, blower motor resistor, window regulators, ignition components Wiring Harnesses: Insulation degradation on older wiring harnesses can lead to electrical issues K Jetronic: K-Jetronic system can require meticulous tuning and maintenance for optimal performance 📚 Vehicle History Brand Heritage Brand Legacy: Mercedes-Benz renowned for engineering, luxury, and durability Model Evolution W126 Introduction: The W126 chassis (S-Class sedan) was introduced in 1979, with the C126 SEC coupe variant following shortly after. Sec Positioning: The SEC represented the pinnacle of Mercedes-Benz coupe design and engineering, offering luxurious and powerful grand touring capabilities. Production Production Period: 1981-1991 (for C126 SEC) Manufacturing Location: Germany 🏆 Awards & Recognition...