🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 S-Class Generation Model Generation: First Generation (1979-1991) Codes Chassis Code: W126 👋 Introduction Market Position Positioning: The W126 S-Class represented the pinnacle of luxury and engineering in its era, offering a refined driving experience and advanced technology. This manual serves owners and enthusiasts seeking to maintain or restore these prestigious vehicles. Competitive Analysis Competitors: Competed directly with luxury sedans from BMW (E23 7 Series), Jaguar (XJ Series), and American luxury marques like Cadillac. Key Features Unique Selling Points: Exceptional build quality, robust engineering, advanced safety features for its time (e.g., ABS, airbags on later models), powerful V8 engines, sophisticated suspension, and luxurious interior appointments. 📋 Manual Details Coverage Areas Covered Model Years: 1979-1991 (all variants within the W126 generation) Engine Variants Covered: M116 (3.8L V8), M117 (4.2L V8, 5.0L V8, 5.6L V8), OM617 (3.0L Diesel I5), OM603 (3.0L Diesel I6) Page Count Estimated Page Count: Over 1000 pages (typical for comprehensive service manuals) Manual Type Type: Service and Repair Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Engine: Detailed diagnostics, overhaul, lubrication, cooling, fuel injection (Bosch K-Jetronic/KE-Jetronic, Diesel indirect injection), ignition, emission control systems. Transmission: Automatic transmissions (e.g., 722.3, 722.4, 722.5): maintenance, repair, adjustments, torque converter servicing, fluid specifications. Suspension: Front and rear suspension components, shock absorbers, springs, ball joints, bushings, steering system (including power steering). Brakes: Hydraulic system, ABS (Anti-lock Braking System), brake pads, rotors, calipers, lines, master cylinder, parking brake. Electrical: Complete wiring diagrams, troubleshooting for lighting, ignition, starting, charging, climate control, power windows/locks/seats, central locking, instrument cluster, diagnostic codes. Bodywork: Panel removal/installation, door mechanisms, window regulators, sunroof operation, trim components, collision repair considerations. Climate Control: Air conditioning system (R12), heating system, blower motor, HVAC controls, troubleshooting. Fuel System: Fuel tank, fuel pump, fuel lines, fuel filters, fuel injection system details for gasoline and diesel variants. Procedures Included Maintenance: Scheduled maintenance (oil changes, filter replacements, fluid checks), tune-ups, lubrication points, belt replacements. Repair: Engine rebuild procedures, transmission overhaul, brake system repairs, suspension component replacement, electrical system diagnostics and repair, body panel repairs. Diagnostics: Troubleshooting flowcharts, identifying symptoms, interpreting fault codes (OBD I era), diagnostic testing procedures for all major systems. Assembly Disassembly: Step-by-step instructions with diagrams for component removal and installation for all major vehicle systems. Cleaning: Procedures for cleaning specific engine components, fuel injectors, and other parts during repair. Painting: While the manual may not detail painting techniques extensively, it will cover the removal and reinstallation of body panels and trim relevant to painting. Technical Depth Depth: Comprehensive. Covers everything from basic maintenance to complete engine and transmission overhauls, including detailed electrical schematics and diagnostic procedures. Diagrams: Includes detailed diagrams for assembly and disassembly, wiring schematics, and exploded views of various components. Troubleshooting: Provides systematic troubleshooting guides for common and complex issues across all vehicle systems. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content for quick information retrieval. Print Quality Printability: Printable by section or in its entirety. Binding Type Binding: N/A (Digital) Paper Type Paper Quality: N/A (Digital) Manual Completeness Completeness: Comprehensive Service and Repair Manual covering all aspects of vehicle maintenance and repair. ⚙️ Engine Specifications Primary Engine Common V8 Engine: M117 (4.2L/5.0L/5.6L) SOHC V8 Common Diesel Engine Diesel Engine: OM603 (3.0L) SOHC Inline-6 Turbo Diesel Performance Typical Horsepower Range: 140 hp (early diesel) to 260 hp (5.6L V8) Typical Torque Range: 180 lb-ft (early diesel) to 330 lb-ft (5.6L V8) Fuel System Gasoline Fuel Injection: Bosch CIS (Continuous Injection System) and later CIS-Jetronic (KE-Jetronic) Diesel Fuel Injection: Bosch inline injection pump (indirect injection) Lubrication Oil Type Recommendation: API SG or higher, SAE 10W-40 or 15W-40 (check specific model year and climate for precise recommendation) Cooling Coolant Type Recommendation: Mercedes-Benz approved ethylene glycol coolant (e.g., G48/Z) mixed 50/50 with distilled water. 🔧 Transmission Standard Standard Transmission: 4-speed Automatic (722.3, 722.4) Optional Optional Transmission: 5-speed Automatic (722.5 with Lock-up Clutch) Features Transmission Fluid Type: MB 236.1 Specification (e.g., Dexron III compatible, but MB spec is preferred) Transmission Fluid Capacity: Approximately 7-8 liters (check specific model for exact capacity) 📐 Dimensions Exterior Wheelbase Standard: 2935 mm (115.6 in) Overall Length Standard: 4965 mm (195.5 in) Weights Curb Weight Range: 1600 kg - 1900 kg (depending on engine and options) 🛡️ Safety Features Ratings Historical Safety Perception: Considered exceptionally safe and robust for its era, with strong unibody construction. Active Features ABS: Available on later models and as an option. Passive Features Airbags: Driver's airbag became standard on later models (post-facelift, 1986 onwards); passenger airbag optional. Seatbelts: Front and rear seatbelts, front pre-tensioners on later models. 💡 Technology Features Infotainment Audio System: Original Becker or Blaupunkt radios with optional CD changers on later models. Analog climate control or early digital climate control systems. Driver Assistance Cruise Control: Standard on most...