🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEL Generation: First Generation (1979-1991) Chassis Code: W126 Body Style: Long-wheelbase Sedan (SEL) Production Years Covered: 1979-1992 Codes Internal Model Code: W126 👋 Introduction Market Position Market Position: Luxury Sedan, flagship model for Mercedes-Benz during its production run Competitive Analysis Competitive Analysis: Competed with other high-end luxury sedans of its era, known for build quality, engineering, and comfort. Key Features Key Features: Exceptional ride comfort, advanced safety features for its time, powerful yet refined engines, spacious interior, and sophisticated styling. Manual Value Proposition Manual Value Proposition: Provides authorized repair information, empowering owners and independent technicians to maintain and repair the W126 SEL to factory standards. Ease Of Use Ease Of Use: Digital format allows for quick searching, printing specific pages, and easy storage, eliminating the need for bulky physical manuals. 📋 Manual Details Coverage Areas Coverage Scope: All models and all repairs A-Z for the W126 SEL Page Count Page Count: N/A (Digital PDF) Manual Type Manual Type: Factory Service and Repair Manual Language Language: English Format Format: PDF (Printable, Zoomable) Digital Requirements Digital Requirements: Adobe PDF Reader, Winzip (Optional) 📖 Manual Coverage Systems Covered Engine Overhaul: Complete engine disassembly, inspection, assembly, and tuning Fuel System: Fuel injection systems (Bosch K-Jetronic/KE-Jetronic), fuel pumps, injectors, fuel pressure regulators Ignition System: Ignition coils, distributors, spark plugs, ignition control modules Cooling System: Radiator, water pump, thermostat, cooling fans, hoses Lubrication System: Oil pump, oil filter, oil cooler, oil passages Intake Exhaust Emissions: Intake manifolds, exhaust systems, catalytic converters, emission control systems Automatic Transmission: 4-speed Automatic Transmission (e.g., 722.3, 722.4) overhaul, adjustments, fluid service Manual Transmission: Availability and repair procedures for manual transmission variants (less common on SEL) Drivetrain: Driveshaft, universal joints, differential, axle shafts Suspension: Front and rear suspension components, struts, shocks, control arms, bushings Steering: Steering gear, power steering pump, steering linkages, steering column Brakes: Hydraulic brake system, master cylinder, brake calipers, brake pads, rotors, ABS (Antiblockiersystem) if equipped Parking Brake: Parking brake mechanism and adjustments Electrical System: 12V electrical system, battery, alternator, starter, wiring harnesses Lighting: Headlights, taillights, interior lighting, auxiliary lighting Instrumentation: Instrument cluster, gauges, warning lights, sensors Climate Control: Air conditioning system, heater core, blower motor, climate control panel, refrigerant service Body Exterior: Body panels, doors, hood, trunk, bumpers, glass, mirrors, seals Body Interior: Seats, upholstery, door panels, dashboard, headliner, trim Power Accessories: Power windows, power seats, central locking, power mirrors, sunroof Wiper Washer: Wiper motor, washer pump, wiper blades, washer fluid reservoir Audio Visual: Radio, speakers, antenna, and associated wiring Cruise Control: Cruise control system components and troubleshooting Supplemental Restraint System: Airbag system components (if equipped), seat belt pre-tensioners Engine Immobilizer: Information regarding immobilizer systems if factory-equipped Multiplex Can Communication: Diagnostics and understanding of multiplexed electrical systems and CAN bus if applicable to later models in range Procedures Included Maintenance Procedures: Oil changes, filter replacements, fluid checks and top-offs, tune-ups, belt inspections Diagnostic Procedures: Troubleshooting guides for common and uncommon issues, symptom-based diagnostics Repair Procedures: Detailed step-by-step instructions for component replacement and repair Adjustment Procedures: Valve adjustments, idle speed adjustments, brake adjustments, steering alignment checks Wiring Schematics: Complete and detailed wiring diagrams for all electrical systems Technical Depth Technical Depth: Factory-level diagnostics, repair, and maintenance, covering basic to advanced procedures Illustrations Illustrations: Numerous diagrams, exploded views, and line drawings to aid comprehension Specifications Specifications Included: Torque values, fluid capacities, wear limits, engine data, electrical specifications 📊 Manual Specifications File Format File Format: Portable Document Format (PDF) Print Quality Print Quality: High-resolution, suitable for printing individual pages or sections Binding Type Binding Type: N/A (Digital, no physical binding) Paper Type Paper Type: N/A (Digital, no physical paper) ⚙️ Engine Specifications Primary Engine Engine Options: M116 3.8L V8, M116 4.2L V8, M117 5.0L V8, M117 5.6L V8 (SEL models typically feature larger displacement V8s) Performance Horsepower Torque Ranges: Varies by engine and year; typically 155-238 HP and 220-330 lb-ft torque Fuel System Fuel Injection Type: Bosch K-Jetronic (CIS) or KE-Jetronic (CIS-E) Fuel Injection Ignition Type Ignition System: Distributor-based, breakerless electronic ignition Cooling Type Cooling System: Liquid-cooled, thermostatically controlled 🔧 Transmission Standard Transmission Type: 4-speed Automatic Transmission (e.g., 722.3 or 722.4) Optional Optional Transmission: Manual transmission was rarely offered on SEL models, but covered if applicable to specific market variations. Features Transmission Features: Hydraulically controlled, with torque converter 📐 Dimensions Exterior Wheelbase Sel: Approximately 116.7 inches (2964 mm) Overall Length Sel: Approximately 201.3 inches (5113 mm) Weights Curb Weight: Approximately 3900-4300 lbs (1770-1950 kg), depending on engine and options Gross Vehicle Weight Rating: Typically around 5000-5300 lbs (2270-2400 kg) 🛡️ Safety Features Ratings Crash Test Ratings: N/A for modern standardized ratings, but built to high safety standards of the era. Active Features Active Safety Features: Four-wheel disc brakes, Anti-lock Braking System (ABS) availability on later models. Passive Features Passive Safety Features: Reinforced safety...