🏷️ Basic Information Identification Make: Mercedes-Benz Model: 500 SEL Model Generation: W126 (Second Generation) Model Year Start: 1984 Model Year End: 1985 Codes Chassis Code: W126 Engine Code: M117 (5.0L V8) 👋 Introduction Market Position Market Segment: Full-size Luxury Sedan Competitive Analysis Competitors 1984 85: BMW 7 Series, Audi V8 Quattro, Jaguar XJ-S, Cadillac Eldorado Key Features Vehicle Highlights: Exceptional build quality, advanced engineering, luxurious interior, powerful V8 engine, smooth ride Manual Value Proposition: Empowers owners and technicians with detailed, accurate information for maintenance and repair of a complex luxury vehicle. 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair Page Count Estimated Pages: 800-1200 Manual Type Type: Workshop Manual / Service Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, timing, valve train, lubrication, cooling, fuel injection (Bosch K-Jetronic) Engine Electrical: Ignition system, starter, alternator, ECU diagnostics Transmission: 4-speed Automatic (722.3 series) - diagnostics, overhaul, fluid service Drivetrain: Driveshaft, differential, rear axle overhaul Suspension: Front and rear suspension components, shock absorbers, springs, bushings, alignment Steering: Power steering system, steering gearbox, tie rods, power steering fluid Brakes: Front and rear disc brakes, ABS (Anti-lock Braking System) components, hydraulic system, bleeding procedures Electrical System: Wiring diagrams, lighting, power windows, power seats, climate control, central locking, instrument cluster Body And Chassis: Body panels, doors, hinges, latches, interior trim, glass replacement Climate Control: HVAC system, R134a conversion, refrigerant service, blower motor, heater core, A/C compressor Procedures Included Maintenance: Scheduled maintenance tasks, oil changes, filter replacements, fluid checks and top-offs Diagnostics: Troubleshooting guides for common drivability issues, electrical faults, and mechanical problems Repair: Step-by-step repair instructions for all major vehicle systems Overhaul: Detailed procedures for engine, transmission, and differential rebuilds Adjustments: Carburetor (if applicable), ignition timing, valve lash adjustments Troubleshooting Charts: Systematic diagnostic flowcharts for common problems Technical Depth Depth: Comprehensive (from basic maintenance to full engine rebuilds and electrical diagnostics) Diagnostic Tools: Guidance on using specialized tools and diagnostic procedures 📊 Manual Specifications File Format Format Details: Searchable PDF with high-resolution diagrams and schematics Print Quality Quality: Excellent clarity for diagrams, text, and illustrations Binding Type Binding: N/A (Digital Format) Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: V8, SOHC (Single Overhead Camshaft) Displacement: 4973 cc (5.0 Liters) Bore X Stroke: 92.0 mm x 92.4 mm Compression Ratio: 8.3:1 Cylinder Block Material: Cast Iron Cylinder Head Material: Aluminum Alloy Performance Horsepower SAE Net: 180 hp @ 4200 rpm (approx.) Torque SAE Net: 238 lb-ft @ 2500 rpm (approx.) Fuel System Fuel Injection System: Bosch K-Jetronic CIS (Continuous Injection System) Fuel Type: Unleaded Premium Gasoline (91 Octane or higher recommended) Engine Management Engine Control Unit: Bosch Electronic Control Unit (ECU) for fuel injection and ignition timing 🔧 Transmission Standard Transmission Type: 4-Speed Automatic Transmission Model: 722.3 Series Features Gear Ratios: Refer to manual for specific ratios (typically 3.68 / 2.42 / 1.49 / 1.00) Transmission Fluid Type: Mercedes-Benz ATF Specification 236.1 (e.g., Dexron III compatible, but check manual for exact spec) 📐 Dimensions Exterior Length: 5010 mm (197.2 in) Width: 1790 mm (70.5 in) Height: 1440 mm (56.7 in) Wheelbase: 2935 mm (115.6 in) Weights Curb Weight: 1830 kg (4034 lbs) approx. Gross Vehicle Weight Rating: 2300 kg (5070 lbs) approx. 🛡️ Safety Features Ratings Crash Test Data: Era-specific safety standards, no standardized NCAP ratings available for this vintage. Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Optional (ASR - Acceleration Slip Regulation on some later models, less common in '84-'85) Passive Features Airbags: Driver-side airbag became standard in late 1984/1985 models, refer to specific vehicle build. Seatbelts: Three-point front and rear seatbelts Crumple Zones: Advanced crumple zone design for its era 💡 Technology Features Infotainment Audio System: Factory AM/FM stereo with cassette player, optional premium sound system. Controls: Manual climate controls, mechanical dashboard gauges. Driver Assistance Cruise Control: Standard cruise control system Headlights: Halogen headlights, manual leveling adjustment. Connectivity Connectivity Features: Analog systems, no modern connectivity features like Bluetooth or USB. 🔧 Maintenance Service Intervals Oil Change Interval: Every 10,000 km (6,000 miles) or 12 months, whichever comes first (check manual for exact specification) Transmission Fluid Service: Every 40,000 km (25,000 miles) or 24 months (check manual for exact specification) Fluid Specifications Engine Oil Capacity: 7.5 Liters (7.9 US Quarts) with filter Engine Oil Viscosity: SAE 15W-40 or 10W-40 API SG/CD rating recommended (consult manual for specific temperature ranges) Coolant Type: Ethylene glycol-based antifreeze (MB Specification 325.0) Known Issues Common Problems: Wiring harness degradation (especially brittle insulation), fuel distributor leaks (K-Jetronic), vacuum line leaks, SLS (Self-Leveling Suspension) issues, climate control flap actuators, transmission cooling line leaks. Maintenance Priority: Regular inspection and replacement of rubber hoses, vacuum lines, and electrical connectors is crucial for reliability. 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Pioneer in automotive safety and...