🏷️ Basic Information Identification Make: Mercedes-Benz Model: 500 SEL Years Covered: 1984, 1985 Codes Chassis Code: W126 Engine Code Primary: M117 👋 Introduction Market Position Segment: Full-size Luxury Sedan Key Selling Points: Exceptional build quality, advanced engineering, luxurious interior, powerful V8 engine, comfortable ride, high safety standards for its era. Competitive Analysis Primary Competitors: BMW 7 Series (E23), Jaguar XJ-S, Rolls-Royce Silver Spirit, Cadillac Fleetwood. Key Features Distinguishing Features: W126 chassis's aerodynamic design, reputation for durability and longevity, sophisticated engineering, plush interior appointments. 📋 Manual Details Coverage Areas Primary Coverage: All mechanical and electrical systems for 1984-1985 Mercedes-Benz 500 SEL. Secondary Coverage: Bodywork, chassis, diagnostics, troubleshooting, preventative maintenance. Page Count Estimated Page Count: 800-1200 (estimated for a comprehensive factory manual, exact count not provided in product info) Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder head, valve train, crankshaft, connecting rods, pistons, lubrication system, cooling system, fuel injection system (Bosch KE-Jetronic), exhaust system. Engine Electrical: Ignition system, starter motor, alternator, engine control unit (ECU) diagnostics, wiring diagrams. Transmission: Automatic transmission (e.g., 722.3 series), torque converter, hydraulic control, shift linkage, transmission fluid and filter service. Drivetrain: Drive shaft, universal joints, rear axle assembly, differential, half-shafts. Suspension: Front suspension (independent, double wishbone), rear suspension (independent, multi-link), shock absorbers, springs, bushings, steering knuckle assembly. Steering: Power steering system, steering box, steering column, tie rods, linkage. Brakes: Front disc brakes (ventilated), rear disc brakes, brake hydraulics, ABS (Anti-lock Braking System) if equipped, parking brake. Electrical System: Battery, charging system, lighting system (headlights, taillights, interior), power windows, power seats, central locking, climate control system electronics, instrument cluster, fuse box and relay locations. Bodywork: Body panel removal and installation, door mechanisms, hood, trunk lid, interior trim, weatherstripping. HVAC: Air conditioning system components, heater core, blower motor, control panels, refrigerant handling. Procedures Included Routine Maintenance: Oil and filter changes, spark plug replacement, air filter replacement, fuel filter replacement, coolant flush, brake fluid flush, lubrication points. Diagnostic Procedures: Troubleshooting charts, fault code interpretation (if applicable), component testing, measurement specifications. Repair Procedures: Engine overhaul, transmission overhaul, brake system repair, suspension component replacement, steering system repair, electrical component replacement, body repair. Component Disassembly Reassembly: Detailed step-by-step instructions for removing, disassembling, inspecting, repairing, and reassembling all major components. Special Tools: Identification and usage of specialized tools required for specific repair and maintenance tasks. Technical Depth Depth: Comprehensive factory-level detail suitable for professional mechanics and experienced DIY enthusiasts. Covers everything from basic adjustments to complete engine and transmission rebuilds. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable if digitally created or scanned with OCR, allowing for quick navigation to specific topics. Print Quality Quality: Depends on original source; factory manuals are typically clear and well-illustrated. Download quality may vary. Binding Type Type: N/A (Downloadable PDF) Paper Type Type: N/A (Downloadable PDF) ⚙️ Engine Specifications Primary Engine Engine Type: V8, SOHC (Single Overhead Camshaft) Displacement: 4.973 Liters (303.5 cubic inches) Bore X Stroke: 94.5 mm x 85.0 mm Compression Ratio: 9.2:1 (typical, may vary slightly by market) Fuel Delivery: Bosch KE-Jetronic Continuous Injection System (CIS-E) Performance Horsepower: Approx. 230-240 hp (DIN) at 4750 rpm (exact figures vary by market and tuning) Torque: Approx. 280-288 lb-ft (380-395 Nm) at 2800-3000 rpm Fuel System Fuel Type: Premium Unleaded Gasoline (91+ octane) 🔧 Transmission Standard Type: 4-speed Automatic (e.g., 722.3xx series) Optional Type: Not typically offered with manual transmission in the 500 SEL for these years in major markets. Features Features: Hydraulic torque converter, electronically controlled (for shift points and lock-up clutch on later models within this range), rear-wheel drive. 📐 Dimensions Exterior Length: Approx. 5005 mm (197.0 in) Width: Approx. 1790 mm (70.5 in) Height: Approx. 1430 mm (56.3 in) Wheelbase: Approx. 2935 mm (115.6 in) Weights Curb Weight: Approx. 1750-1850 kg (3858-4079 lbs) Gross Vehicle Weight: Approx. 2300 kg (5070 lbs) 🛡️ Safety Features Ratings Era Specific Ratings: Considered among the safest sedans of its time due to robust construction and design, though formal crash ratings like NHTSA were less standardized then. Active Features Active Safety: Four-wheel disc brakes, optional Anti-lock Braking System (ABS), power steering. Passive Features Passive Safety: Reinforced passenger cell, energy-absorbing crumple zones, driver's airbag (introduced on some W126 models during this period, though may not be standard on all '84-'85 500 SEL), seat belts with pre-tensioners, laminated windshield. 💡 Technology Features Infotainment Infotainment System: Basic analog radio with cassette player, manual climate control. Optional features might include upgraded sound systems. Driver Assistance Driver Assistance: Optional ABS (Anti-lock Braking System) was available, marking an early adoption of advanced braking technology. Connectivity Connectivity: Limited by modern standards; primarily mechanical linkages for controls and basic electrical systems. No integrated Bluetooth or USB. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles...