🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 Model Generation: First Generation (1979-1991) Body Style: SE (Standard Wheelbase Sedan), SEL (Long Wheelbase Sedan), SEC (Coupe) Codes Chassis Code: W126 👋 Introduction Market Position Segment: Full-size Luxury Sedan/Coupe Competitive Analysis Key Competitors: BMW 7 Series (E23/E32), Audi V8 Quattro, Jaguar XJ, Cadillac Fleetwood. Key Features Design Philosophy: Emphasized build quality, safety, comfort, and understated luxury. Introduction of advanced safety features and aerodynamic design principles for its era. Distinctive Elements: Iconic 'S-Class' styling, robust engineering, sophisticated ride quality, powerful straight-six and V8 engines, and available long-wheelbase (SEL) for increased rear passenger space. 📋 Manual Details Coverage Areas Vehicle Years Covered: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992 Engine Variants Covered: All W126 engine variants including M110, M116, and M117 in their various displacements and fuel injection configurations. Page Count Total Pages: 5000+ Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Management: Detailed diagnostic, testing, and repair procedures for fuel injection (KE-Jetronic, K-Jetronic), ignition systems, emissions control. Drivetrain: Comprehensive coverage of automatic and manual transmissions, differential, driveshafts, and clutch (if applicable). Suspension Steering: Service, repair, and adjustment procedures for front and rear suspension, power steering system, including hydraulic components and steering gearbox. Brakes: Detailed instructions for hydraulic brake system, ABS (Anti-lock Braking System), brake disc/pad replacement, caliper service, and bleeding procedures. Electrical Electronics: Extensive coverage of wiring diagrams, fuse/relay identification, starter, alternator, battery, lighting systems, power windows, locks, mirrors, and climate control electronics. Body Exterior: Repair and adjustment of body panels, doors, hood, trunk, bumpers, glass, convertible top mechanisms (if applicable), and trim. Body Interior: Disassembly and reassembly of dashboard, seats, door panels, headliner, HVAC components, and interior trim. Climate Control: Service, diagnosis, and repair of air conditioning and heating systems, including refrigerant handling and component replacement. Fuel System Details: In-depth troubleshooting and repair of mechanical and electronic fuel injection systems, fuel pumps, fuel pressure regulators, injectors, and associated lines and sensors. Exhaust System: Information on catalytic converters, exhaust manifold, mufflers, and pipes, including diagnosis of leaks and component replacement. Emission Control Systems: Detailed procedures for diagnosing and servicing emissions control components, including secondary air injection, EGR (where applicable), and evaporative emission control systems. Lighting And Signals: Troubleshooting for headlights, taillights, turn signals, hazard lights, interior lighting, and related control modules. Wiper Washer System: Service and repair of wiper motor, linkage, wiper blades, and washer fluid pump and reservoir. Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks and top-offs, lubrication points, spark plug replacement, and belt inspections. Troubleshooting: Systematic diagnostic procedures for common and complex issues, fault code interpretation (where applicable), and testing methods for various components. Component Repair Rebuild: Step-by-step instructions for removal, disassembly, inspection, repair, reassembly, and installation of virtually all major and minor vehicle components. Adjustments Calibrations: Detailed procedures for adjusting carburetors (early models), fuel injection systems, ignition timing, brake systems, parking brake, and suspension alignment parameters. Technical Specifications: Provides torque specifications, fluid capacities, electrical values, wear limits, and critical measurement data for all procedures. Torque Specifications: Extensive lists of torque values for all critical fasteners, ensuring proper assembly and preventing component damage. Diagrams Illustrations: Detailed exploded diagrams, wiring schematics, and photographic illustrations to guide users through repair processes. Technical Depth Depth Of Coverage: Comprehensive, bumper-to-bumper coverage suitable for professional technicians and advanced DIY enthusiasts. Includes detailed explanations and pictorial diagrams for complex tasks. Diagnostic Procedures: Focus on systematic fault diagnosis, including step-by-step guides for identifying issues within various vehicle systems. Special Tools: References to specific Mercedes-Benz special service tools required for certain operations, with explanations of their usage. Cooling System Coverage Cooling System: Radiator, water pump, thermostat, coolant hoses, expansion tank, and fan clutch service and replacement procedures. 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Yes, all pages are printable for convenient workshop use. Binding Type Binding: Digital (PDF) Paper Type Digital Medium: Downloadable PDF Software Requirement Viewer: Adobe Reader Compatibility Operating Systems: Windows, macOS, Linux ⚙️ Engine Specifications Primary Engine Engine Options: M110 (2.8L I6), M116 (3.8L V8), M117 (4.2L V8, 5.0L V8, 5.6L V8) Performance Horsepower Range: Approximately 155 hp (2.8L) to 240 hp (5.6L) Torque Range: Approximately 177 lb-ft (2.8L) to 330 lb-ft (5.6L) Fuel System Injection Systems: Bosch K-Jetronic mechanical fuel injection (early models), Bosch KE-Jetronic electronic fuel injection (later models). Ignition System Ignition Type: Electronic ignition with distributors. Cooling System Coolant Type: Typically 50/50 mixture of Mercedes-Benz approved antifreeze and distilled water. Engine Management Engine Variants Detail: 2.8L M110 (DOHC I6), 3.8L M116 V8, 4.2L M117 V8, 5.0L M117 V8, 5.6L M117 V8 (later designated as 5.6L M117 E56). 🔧 Transmission Standard Standard Transmission: 4-speed automatic (e.g., 722.3) Optional Optional Transmission: 5-speed manual (rare, primarily on earlier European models). Features Transmission...