🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEL Year: 1991 Generation Generation Designation: Second Generation (Facelifted) Codes Chassis Code: W126 Body Style Code: SEL (Special Long Sedan) 👋 Introduction Market Position Target Audience: Enthusiasts, DIY mechanics, and professional technicians seeking definitive repair information for the W126 SEL. Value Proposition: Provides dealership-level repair accuracy and completeness, empowering users to maintain and repair their vehicle efficiently. Competitive Analysis Advantage: Vehicle-specific, factory-authorized content, offering superior accuracy over generic repair guides. Key Features Feature 1: Step-by-step instructions with clear diagrams and illustrations. Feature 2: Comprehensive wiring schematics for accurate electrical troubleshooting. Feature 3: All information contained in a single, easy-to-navigate PDF. Feature 4: Printable pages for use in the workshop without damaging the original file. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive service, repair, diagnostic, and maintenance for 1991 Mercedes-Benz W126 SEL models. Secondary Coverage: All models and all repairs from A-Z, including specific sub-systems. Page Count Estimated Page Count: Estimated 1500-2500 pages (typical for factory service manuals of this era). Manual Type Type: Factory Service and Repair Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine: Detailed coverage of engine systems, including diagnostics, repair, and overhaul. Control System: Engine control unit (ECU) diagnostics and calibration. Mechanical: In-depth mechanical system repair and overhaul. Fuel Service: Fuel system diagnostics, repair, and specifications. Emission Control: Emission control systems, diagnostics, and adjustment procedures. Intake Exhaust Cooling: Complete coverage of intake, exhaust, and cooling systems. Lube: Lubrication system maintenance and specifications. Ignition Starting Charging: Ignition, starting, and charging system diagnostics and repair. Auto Transmission: Automatic transmission service, repair, and troubleshooting. Manual Transmission: Coverage for manual transmission variants (if applicable to the specific W126 SEL). Drivetrain: Transfer case, propeller shaft, drive shaft, differential, and axle maintenance and repair. Suspension: Axle, suspension, and wheel alignment procedures and specifications. Tire Wheel: Tire and wheel specifications and service. Brake Control: Brake control systems, including ABS diagnostics and repair. Brakes: Complete brake system service and repair. Parking Brake: Parking brake system maintenance and adjustment. Steering Column: Steering column and tilt/telescope mechanisms. Power Steering: Power steering system diagnostics, repair, and fluid specifications. Air Conditioning: Air conditioning system service, recharge, and repair. Restraint System: Supplemental Restraint System (SRS) components and diagnostics (airbags). Seat Belt: Seat belt system maintenance and repair. Immobilizer: Engine immobilizer system diagnostics and repair (if equipped). Cruise Control: Cruise control system diagnostics and repair. Wiper Washer: Wiper and washer system maintenance and repair. Door Lock: Door lock and central locking system service. Meter Audio Visual: Instrument cluster, meter functions, and audio/visual system diagnostics. Horn: Horn system diagnosis and repair. Windshield Glass Mirror: Windshield, glass, and mirror replacement and service. Instrument Panel: Instrument panel removal, installation, and component repair. Seat: Seat adjustment mechanisms and upholstery repair. Engine Hood Door: Hood and door mechanisms, hinges, and latches. Exterior Interior: Exterior trim, interior trim, and body panel repair. Electrical: Comprehensive electrical system diagnosis and repair. Multiplex Can Communication: Multiplex and CAN communication systems diagnostics (if applicable to this year/model). Procedures Included Maintenance: Regular scheduled maintenance, fluid checks, filter replacements. Diagnostics: Troubleshooting guides, fault code interpretation, diagnostic procedures. Repair: Step-by-step repair instructions for all covered systems. Rebuilds: Complete engine, transmission, and major component rebuild procedures. Specifications: Torque specifications, clearances, fluid capacities, electrical values. Wiring Schematics: Detailed factory wiring diagrams for all electrical systems. Illustrations Diagrams: High-quality illustrations, exploded views, and diagrams for clarity. Technical Depth Depth: Factory level technical depth, covering everything from basic maintenance to advanced diagnostics and complete overhauls. 📊 Manual Specifications File Format File Type: PDF Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac compatible. Requirements: Adobe PDF Reader and WinZip (free online). Print Quality Printability: All pages are printable. Image Scaling: Images and diagrams can be blown up and printed in enlarged copies. Binding Type Binding: Digital (PDF) - No physical binding. Paper Type Paper Type: N/A (Digital format). ⚙️ Engine Specifications Primary Engine Engine Code Typical: M116 (4.2L V8) or M117 (5.0L V8) - common for W126 SEL models. Engine Code Typical Displacement Typical: 4196 cc (4.2L) or 4973 cc (5.0L) Performance Horsepower Typical: Approx. 200-240 hp (depending on specific engine variant and market). Torque Typical: Approx. 240-290 lb-ft (depending on specific engine variant and market). Fuel System Fuel Injection Type: Bosch K-Jetronic or KE-Jetronic (CIS-E) fuel injection. Fuel Type: Premium Unleaded Gasoline 🔧 Transmission Standard Transmission Type: 4-speed automatic transmission (e.g., 4G-TRONIC). Optional Optional Transmission: Manual transmission was generally not offered on SEL models. Features Transmission Fluid Spec: Typically MB 236.1 (e.g., Dexron II or equivalent). 📐 Dimensions Exterior Wheelbase In: 121.1 inches (3075 mm) Overall Length In: 201.1 inches (5108 mm) Weights Curb Weight Lbs Typical: Approx. 4,000-4,300 lbs (1814-1950 kg) 🛡️ Safety Features Ratings Safety Standard: Designed to meet contemporary safety standards of the era. Active Features Active...