🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEL Year: 1984 Codes Chassis Code: W126 Body Style Code: SEL 👋 Introduction Market Position Market Position: High-end luxury sedan, representing Mercedes-Benz's commitment to engineering excellence and occupant comfort in the 1980s. Market Segment: Full-size luxury sedan. Competitive Analysis Competitive Analysis: Competed against other premium luxury sedans of the era such as BMW 7 Series, Jaguar XJ, and Cadillac Fleetwood Brougham, often differentiated by its advanced engineering, build quality, and perceived reliability. Key Features Key Features: Long wheelbase (SEL), refined ride quality, powerful yet smooth engines, extensive use of sound deadening, sophisticated chassis dynamics, and a high level of interior appointments. Quality Of Documentation: Factory original, providing the precise information used by authorized dealerships. 📋 Manual Details Coverage Areas Coverage Areas: All models and all repairs A-Z for the 1984 W126 SEL. Page Count Page Count: Not explicitly stated, but described as 'complete' and 'everything you will ever need'. Manual Type Manual Type: Service and Repair Manual Manual Purpose: Designed for maintaining, servicing, diagnosing, and repairing the specified vehicle by technicians. Language Language: English Language Type: Professionally translated English documentation. Format Format: PDF File Availability: Speed Download 📖 Manual Coverage Systems Covered Systems Covered: Maintenance, Engine, Control System, Mechanical, Fuel Service Specifications, Emission Control, Intake Exhaust Cooling, Lube, Ignition Starting Charging, Auto Transmission, Clutch, Manual Transmission, Transfer Propeller Shaft, Drive Shaft, Differential, Axle Suspension, Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering, Air Conditioning, Supplemental Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter Audio/Visual, Horn, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/Door, Exterior & Interior, Electrical, Multiplex/CAN Communication, and more. Electrical System Coverage: Comprehensive electrical diagrams, wiring schematics for all vehicle systems, troubleshooting electrical faults. Climate Control Coverage: Detailed information on the automatic climate control system, including components, operation, and troubleshooting. Body And Trim Coverage: Covers exterior and interior components, including doors, hood, glass, mirrors, seats, and trim pieces. Safety Systems Coverage: Details on seat belts, supplemental restraint systems (airbag), and related diagnostics. Chassis And Suspension Coverage: Covers axle, suspension components, steering, and wheel assemblies. Procedures Included Procedures Included: Step-by-step instructions, diagnostic procedures, servicing, routine maintenance, component repair, system overhaul, electrical troubleshooting, wiring schematics, component installation/replacement. Diagnostic Procedures: Detailed troubleshooting charts, diagnostic trees, and fault code identification (where applicable for the era). Repair Procedures: Includes detailed step-by-step instructions for overhauling engine components, transmission, suspension, brakes, and more. Troubleshooting Coverage: Extensive troubleshooting guidance for various systems and components. Technical Depth Technical Depth: Provides detailed torque specifications for critical fasteners throughout the vehicle. 📊 Manual Specifications File Format File Format: Adobe PDF File Format Compatibility: Windows Vista 32/64, XP, ME, 98, NT, 2000, and Mac compatible. Required Software: Adobe PDF Reader and Winzip (free online). Print Quality Print Quality: Printable pages, with ability to blow up images for enlarged copies. Print Feature: Print only the pages and diagrams you require. Binding Type Binding Type: Digital (no physical binding) Paper Type Paper Type: Not applicable (digital format) ⚙️ Engine Specifications Primary Engine Primary Engine: Likely the M116 or M117 V8 engine. For 1984, this would typically be the 5.0L V8 (M117.968). Engine Designation: M117 V8 Performance Performance: The 5.0L V8 typically produced around 180-200 horsepower and substantial torque, optimized for smooth power delivery and cruising. Engine Type: V8 SOHC (Single Overhead Camshaft). Fuel System Fuel System: Bosch K-Jetronic (CIS) mechanical fuel injection. Fuel Injection Type: Continuous Injection System (CIS) with a mechanical fuel distributor. 🔧 Transmission Standard Standard: 4-speed automatic transmission (e.g., 722.3 series). Optional Optional: Manual transmission was not offered on the SEL models. Features Features: Smooth shifting, robust design, often featuring a torque converter lock-up for improved fuel efficiency at cruising speeds. 📐 Dimensions Exterior Exterior: The SEL (Sonderklasse Lang - Special Class Long) designation signifies a longer wheelbase version of the W126 chassis, providing significantly more rear legroom. Wheelbase: Extended wheelbase compared to the standard W126 sedan. Interior Interior: Spacious cabin with ample legroom, particularly in the rear due to the SEL's extended wheelbase. Cargo Cargo: Generous trunk space suitable for luxury touring. Weights Weights: Curb weight would be substantial, likely in the range of 4000-4500 lbs (1800-2040 kg) depending on specific options. 🛡️ Safety Features Ratings Ratings: Not subject to modern crash rating standards, but built to high German safety standards of the era. Active Features Active Features: Four-wheel disc brakes with Anti-lock Braking System (ABS) was an available option. Passive Features Passive Features: Reinforced safety cell, energy-absorbing steering column, front and rear crumple zones, driver's airbag (often optional or introduced later in the model run), seat belt pre-tensioners. 💡 Technology Features Infotainment Infotainment: Basic audio systems of the era, often with cassette player and analog tuning. Climate control systems were sophisticated for their time, often with automatic temperature regulation. Driver...