🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEC Year: 1979 Codes Chassis Code: W126 Body Style Code: C126 👋 Introduction Market Position Target Audience: W126 SEC owners, independent mechanics, DIY enthusiasts Competitive Analysis Uniqueness: Vehicle-specific, factory-derived information, not generic Key Features Ease Of Use: Single, easy-to-use PDF manual, no flipping through books Customization: Print only necessary pages and diagrams Value Proposition Cost Savings: Enables DIY repairs, reducing reliance on expensive dealership services 📋 Manual Details Coverage Areas Manual Type: Service and Repair Manual Language: English Format: PDF Page Count Estimated Page Count: Extensive (Detailed Coverage) File Format File Type: Adobe PDF Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000) & Mac 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, rebuilding, tuning, troubleshooting Engine Control System: Diagnosis and repair of electronic fuel injection and ignition systems Fuel System: Fuel pump, injectors, fuel lines, pressure regulator, fuel tank service Emission Control: Catalytic converter, EGR system, evaporative emission control Cooling System: Radiator, fan, water pump, thermostat, coolant passages Lubrication System: Oil pump, oil filter, oil passages, oil cooler Ignition System: Distributor, ignition coil, spark plugs, wiring, ignition timing Starting Charging System: Starter motor, alternator, battery, charging circuit diagnosis Automatic Transmission: Service, repair, adjustments, fluid and filter changes Manual Transmission: Service, repair, clutch replacement, fluid changes Drivetrain Shafts: Propeller shaft, universal joints, drive shafts, CV joints Differential Axles: Rear axle service, differential overhaul, axle seals Suspension System: Front and rear suspension components, shock absorbers, bushings Wheel Tire System: Wheel bearings, tire mounting, balancing, alignment specifications Brake Control: Brake booster, master cylinder, ABS (if applicable), brake lines Brake Service: Disc brake replacement, caliper overhaul, brake pad replacement Parking Brake: Adjustment, cable replacement, mechanism service Steering Column: Steering column assembly, ignition switch, tilt mechanism Power Steering: Power steering pump, gearbox, fluid lines, troubleshooting Air Conditioning: Refrigerant service, compressor, evaporator, condenser, blower motor Supplemental Restraint System: Airbag system (if applicable), SRS warning lights, diagnostic procedures Seat Belts: Retractor mechanisms, buckles, adjustment Engine Immobilizer: Security system components and diagnosis (if equipped) Cruise Control: System components, vacuum lines, electronic control module Wiper Washer System: Wiper motor, linkage, washer pump, fluid reservoir Door Lock System: Power door locks, vacuum actuators, central locking system Instrument Panel Gauges: Speedometer, tachometer, fuel gauge, warning lamps, gauge cluster repair Audio Visual Systems: Radio, speakers, antenna, troubleshooting Horn System: Horn, horn button, relay, wiring Windshield Glass Mirrors: Windshield replacement, window seals, mirror adjustment Interior Trim: Door panels, dashboard components, seat upholstery, headliner Exterior Body: Body panels, bumpers, trim, door hinges, hood operation Electrical System Overview: Overall electrical component layout and function Multiplex Can Communication: Diagnosis and troubleshooting of electronic communication networks (where applicable to the model year) Procedures Included Maintenance Procedures: Routine service, fluid changes, filter replacements, inspections Diagnostic Procedures: Troubleshooting charts, symptom-to-cause analysis, fault code interpretation Repair Procedures: Step-by-step instructions for all major mechanical and electrical components Rebuilding Procedures: Detailed instructions for engine, transmission, and differential rebuilds Wiring Schematics: Comprehensive electrical wiring diagrams for all systems Diagrams Illustrations: Detailed diagrams and illustrations to aid in disassembly, assembly, and repair Technical Depth Depth Of Coverage: Factory-level, A-Z repairs, dealership technician level 📊 Manual Specifications File Format Printability: Yes (all pages printable) Searchability: Likely searchable text within PDF Print Quality Image Resolution: High (allows blow-up and enlargement) Binding Type Digital Binding: Single PDF file Paper Type Digital Medium: Digital (PDF) ⚙️ Engine Specifications Primary Engine Engine Type: V8 (likely M116 or M117 series) Displacement: Likely 3.8L (M116) or 5.0L (M117) depending on specific 1979 SEC model Performance Horsepower Range: Estimated 155-230 hp (depending on engine size and tuning) Torque Range: Estimated 200-280 lb-ft (depending on engine size) Fuel System Fuel Delivery: Bosch K-Jetronic (CIS) mechanical fuel injection Fuel Type: Unleaded gasoline (premium recommended) 🔧 Transmission Standard Transmission Type: 4-speed automatic (e.g., 4G-TRONIC) Optional Manual Transmission: Not typically offered for SEC models Features Transmission Fluid: Dexron III (or equivalent) - specific capacity and change intervals detailed in manual 📐 Dimensions Exterior Body Style: 2-door Coupe Weights Curb Weight: Approx. 3,700 - 4,000 lbs (depending on engine and options) 🛡️ Safety Features Ratings Crash Safety: Designed to contemporary safety standards; early model may lack modern airbags/ABS as standard Active Features Anti Lock Brakes: Optional on some models, standard on later variants; manual covers diagnosis/repair if equipped Passive Features Airbag System: Driver airbag may be present on later 1979 models or optional; manual details its service if equipped 💡 Technology Features Infotainment Audio System: Factory AM/FM radio with cassette player (optional) Driver Assistance Parking Assistance: None (manual covers basic parking brake system) 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific interval (typically 3,000-5,000 miles or 6-12 months) Fluid Specifications Engine Oil: Refer to manual for specific API service classification and viscosity grade (e.g., 10W-40 or 20W-50) Coolant Type: Ethylene glycol based, 50/50...