🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 Series (S-Class) Model Code: W126 Generation Generation Name: Second Generation S-Class Generation Years: 1979-1991 Codes Chassis Code: W126 👋 Introduction Market Position Class: Full-size Luxury Sedan/Coupe Target Audience: Luxury vehicle owners seeking to perform their own maintenance and repairs. Competitive Analysis Competitors: BMW 7 Series (E23, E32), Jaguar XJ, Cadillac Sedan de Ville, Lincoln Town Car. Key Features Value Proposition: Significant cost savings on repairs and maintenance by empowering owners with detailed instructions and diagrams. Accessibility: Instant delivery via email, usable across multiple devices. 📋 Manual Details Coverage Areas Covered Years: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992 Covered Models: All W126 Series Models/Engines/Trim/Transmission Types Page Count Estimated Page Count: Extensive (exact number not specified, but implies comprehensive) Manual Type Type: Complete Workshop Service Repair Manual Language Language: English Format Format: Downloadable Digital File (PDF) 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, diagnostics, tuning, and repair for all W126 engine variants (M110, M116, M117, M103, M104). Fuel System: Fuel injection systems (K-Jetronic, KE-Jetronic), carburetors (early models), fuel pumps, lines, injectors, and emissions control. Transmission: Automatic transmission service, repair, and overhaul (e.g., 722.3, 722.4, 722.5). Clutch operation for manual transmissions (if applicable). Drivetrain: Drive shafts, differential, axles, and suspension system components. Brakes: Hydraulic system, ABS (Anti-lock Braking System), disc/drum brake service, caliper repair, rotor replacement, and parking brake. Steering: Power steering system, steering box/rack, tie rods, and linkage. Electrical System: Complete electrical system, battery, alternator, starter, wiring diagrams, fuses, relays, lighting, ignition system, and ECUs. Climate Control: HVAC system, A/C compressor, R134a conversion (if applicable), heater core, and climate control modules. Bodywork: Body panel repair, rust prevention, door mechanisms, window regulators, sunroof operation, and trim. Interior: Seat mechanisms, dashboard removal, instrument cluster, and interior trim. Procedures Included Maintenance: Scheduled maintenance (oil changes, filter replacements, fluid checks), tune-ups, belt replacements, and spark plug service. Troubleshooting: Diagnostic procedures for common and uncommon issues, fault code interpretation (where applicable). Repair: Step-by-step instructions for component removal, repair, and reinstallation. Rebuild: Detailed procedures for engine, transmission, and differential rebuilds. Installation: Guidance on installing new or replacement parts. Technical Depth Depth: Comprehensive from basic owner maintenance to advanced engine and transmission rebuilds, including electrical system diagnostics. 📊 Manual Specifications File Format Format: PDF (Portable Document Format) Compatibility: Compatible with all PC & MAC computers, tablets, and mobile phones with Adobe Reader. Print Quality Printability: Fully printable (individual pages, chapters, or entire manual). Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) Features Searchable Text: Implied (standard for most professional PDF manuals) Illustrations: Includes step-by-step instructions with pictures. ⚙️ Engine Specifications Primary Engine Engine Family: M103, M104, M110, M116, M117 Common Engines Covered: 2.6L Inline-6 (M103), 3.0L Inline-6 (M103), 3.0L Inline-6 (M104 DOHC), 3.8L V8 (M116), 4.2L V8 (M116/M119), 5.0L V8 (M117), 5.6L V8 (M117/M119). Performance Horsepower Range: Approx. 140 hp to 270 hp depending on engine variant. Torque Range: Approx. 200 Nm to 400 Nm depending on engine variant. Fuel System Injection Type: Bosch K-Jetronic (CIS), Bosch KE-Jetronic (CIS-E), Monojetronic (early 2.6L) and early models may have carburetors. 🔧 Transmission Standard Transmission Type: 4-speed Automatic (722.3, 722.4, 722.5) Optional Optional Transmission Type: 5-speed Manual (rare, early models) Features Automatic Features: Lock-up torque converter, hydraulic control, sometimes with selectable sport/economy modes. 📐 Dimensions Exterior Wheelbase Sedan: Approx. 2935 mm (115.6 inches) Wheelbase Coupe: Approx. 2800 mm (110.2 inches) Length: Approx. 4995 mm (196.7 inches) for Sedan, 4910 mm (193.3 inches) for Coupe. Width: Approx. 1800 mm (70.9 inches) Height: Approx. 1430 mm (56.3 inches) for Sedan, 1390 mm (54.7 inches) for Coupe. Weights Curb Weight: Approx. 1600-1800 kg (3527-3968 lbs) depending on model and equipment. Gross Vehicle Weight Rating: Varies by model, typically around 2200-2300 kg. 🛡️ Safety Features Ratings Crash Test Performance: While formal independent crash test ratings from agencies like NHTSA or IIHS are less common for this era, the W126 was renowned for its robust construction and safety engineering. Active Features ABS: Anti-lock Braking System (ABS) standard on most models from the mid-1980s onwards. Traction Control: Optional ASR (Anti-Slip Regulation) available on later models. Passive Features Airbags: Driver's side airbag introduced in 1988, becoming standard later. Seatbelts: Pre-tensioning seatbelts, reinforced safety cage. Lighting: Halogen headlights, often with headlight washers and wipers on higher trims. 💡 Technology Features Infotainment Audio System: Premium sound systems (Becker units), optional CD changers on later models. Climate Control: Automatic climate control (Thermatic) with manual override, optional dual-zone climate control on some models. Driver Assistance Cruise Control: Standard on most models. Memory Seats: Optional on driver and passenger seats. Connectivity Tele Aid: Not available on this generation. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000-15,000 km (6,000-10,000 miles) or annually, depending on driving conditions and oil type used....