🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEC Year: 1980 Codes Chassis Code: W126 Body Style Code: C126 👋 Introduction Market Position Target Audience: Mercedes-Benz W126 SEC owners, independent repair shops, and automotive enthusiasts. Value Proposition: Provides dealership-level technical information for DIY repairs and maintenance, saving significant costs compared to professional service. Competitive Analysis Uniqueness: Vehicle-specific, not generic. Offers complete A-Z coverage for the 1980 W126 SEC model. Key Features Content Format: Step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications in a single, easy-to-use PDF. Digital Benefits: Printable pages, searchable text, ability to zoom and print specific sections, eliminates physical wear and tear. Dealer Equivalence: Identical information used by authorized Mercedes-Benz technicians. 📋 Manual Details Coverage Areas Primary Coverage: Complete Service and Repair for 1980 Mercedes-Benz W126 SEC models. Model Variants Covered: All W126 SEC variants for the 1980 model year. Page Count Estimated Page Count: Comprehensive (exact number not specified, but implies extensive detail). Manual Type Type: Factory Service and Repair Manual. Language Language: English Format Format: Digital PDF (Printable). 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical, fuel system, lubrication, cooling, emission control, intake and exhaust. Drivetrain Systems: Automatic transmission, manual transmission (if applicable), transfer case, drive shaft, differential, axle, suspension. Brake Systems: Brake control, hydraulic brakes, parking brake, ABS (if equipped on 1980 models). Steering Systems: Steering column, power steering. Electrical Systems: Ignition, starting, charging, lighting, instrumentation, wiring schematics, multiplex/CAN communication (early forms if applicable). Body And Interior: Exterior, interior trim, doors, windows, mirrors, seats, instrument panel, HVAC (air conditioning). Safety Systems: Supplemental Restraint System (SRS - early forms/components), seat belts, engine immobilizer (if applicable). Comfort And Convenience: Cruise control, wipers and washers, door locks, horn, meter, audio/visual systems. Procedures Included Diagnostic Procedures: Detailed diagnostic trees and troubleshooting guides for all major systems. Maintenance Procedures: Scheduled maintenance, fluid changes, filter replacements, tune-ups. Repair Procedures: Step-by-step instructions for all mechanical, electrical, and body repairs, from minor to major overhauls. Component Replacement: Removal and installation procedures for virtually all vehicle components. Wiring Schematics: Comprehensive and detailed electrical wiring diagrams for all circuits. Technical Depth Depth Of Information: Factory-level detail, equivalent to dealership technician manuals. Covers everything from basic adjustments to complete component rebuilds. 📊 Manual Specifications File Format File Type: PDF Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac compatible. Requirements: Adobe PDF Reader and Winzip (free online). Print Quality Printable: Yes, all pages are printable. Image Scaling: Images can be blown up for enlarged copies. Binding Type Binding: N/A (Digital Format). Paper Type Paper Type: N/A (Digital Format). ⚙️ Engine Specifications Primary Engine Engine Code Family: M116 / M117 (V8) Displacement Liters: 3.8 L (M116) or 5.0 L (M117) Configuration: V8 Performance Horsepower Approx 3.8L: 155-160 hp (SAE Net) Torque Approx 3.8L: 200-210 lb-ft (SAE Net) Horsepower Approx 5.0L: 230-240 hp (SAE Net) Torque Approx 5.0L: 270-280 lb-ft (SAE Net) Fuel System Fuel Delivery: Bosch K-Jetronic (CIS - Continuous Injection System) Fuel Injection. Fuel Type: Unleaded Gasoline. Control System Engine Management: Mechanical fuel injection control with electronic ignition timing. 🔧 Transmission Standard Type: 4-speed Automatic Transmission (4G-Tronic). Optional Type: Manual transmission was not typically offered on the SEC coupe models. Features Shift Modes: Selectable 'E' (Economy) and 'S' (Sport) modes on early 4-speed automatics. 📐 Dimensions Exterior Body Style: 2-door Coupe (Pillarless Hardtop). Wheelbase Mm: 2935 mm (115.6 inches) Length Mm: 4960 mm (195.3 inches) Width Mm: 1820 mm (71.7 inches) Height Mm: 1380 mm (54.3 inches) Weights Curb Weight Kg: Approx. 1700-1800 kg (depending on engine and options) Gross Vehicle Weight Kg: Approx. 2250 kg 🛡️ Safety Features Ratings Federal Safety Standards Compliance: Designed to meet or exceed all applicable US Federal Motor Vehicle Safety Standards (FMVSS) for 1980. Active Features ABS: Anti-lock Braking System (ABS) became optional/standard on later models, verify for specific 1980 configurations. Traction Control: Traction control systems were not common on 1980 models. Passive Features Airbags: Driver's side airbag was an option on some late W126 models, unlikely for 1980 SEC. Seat Belts: 3-point inertia reel seat belts for front occupants, lap belts for rear. Body Structure: Reinforced safety cell with crumple zones. 💡 Technology Features Infotainment Audio System: Original factory-installed AM/FM stereo radio with cassette player. Features varied by market and option packages. Navigation: Navigation systems were not available in 1980. Driver Assistance Cruise Control: Standard or optional electronic cruise control system. Connectivity Connectivity Features: No integrated Bluetooth or modern connectivity features. Analog systems for communication (e.g., power antenna control). Climate Control HVAC System: Fully automatic climate control or manual air conditioning with heating and ventilation. Features advanced (for its time) system with vacuum-actuated controls. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000 km or 6,000 miles (refer to manual for exact specification for 1980). Major Service Interval: Every 40,000-60,000 km (25,000-37,500 miles) for tune-ups,...