🏷️ Basic Information Identification Make: Mercedes-Benz Model: 500 SEC Model Code: C126 Product Name: Mercedes 500 SEC 1984-1985 Service Repair Manual Codes Chassis Code: C126 Engine Code Primary: M117 👋 Introduction Market Position Segment: Luxury Personal Coupe Era: 1980s flagship luxury Competitive Analysis Competitors: BMW 6 Series, Jaguar XJ-S, Rolls-Royce Corniche Key Features Prestige: Represents Mercedes-Benz's pinnacle of engineering and luxury for its time Design: Timeless coupe styling, aerodynamic efficiency 📋 Manual Details Coverage Areas Primary Focus: Vehicle diagnosis and repair procedures Scope: Comprehensive service and repair Page Count Estimated Pages: 400+ Manual Type Type: Service and Repair Manual Language Language: English Format Format: Digital (likely PDF) 📖 Manual Coverage Systems Covered Engine: Detailed overhaul, diagnostics, M117 V8 engine (5.0L) Fuel System: Bosch K-Jetronic fuel injection system diagnostics and repair Ignition System: Distributor ignition system, timing, troubleshooting Transmission: 4-speed automatic transmission (4G-Tronic) service and repair Drivetrain: Rear-wheel drive, differential, driveshafts Suspension: Front and rear suspension components, adjustments, replacement Steering: Power steering system, steering gear, linkages Brakes: Hydraulic system, ABS (if equipped), caliper, rotor, pad service, bleeding Electrical System: 12-volt system, battery, alternator, starter, lighting, fuses, relays Climate Control: Air conditioning system, heater core, blower motor, controls Body And Chassis: Body panel removal, interior trim, glass, seals Diagnostics: Troubleshooting charts, symptom-based diagnostics Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements Repair: Step-by-step repair instructions for all major components Disassembly: Detailed procedures for component removal and disassembly Inspection: Guidelines for inspecting wear, damage, and proper function Reassembly: Instructions for proper reassembly and adjustment Specifications: Torque values, clearances, measurements Technical Depth Depth: Comprehensive, from routine maintenance to major component overhaul Diagnostics Level: Advanced troubleshooting for mechanical and electrical systems 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable if professionally scanned Print Quality Print Readability: Designed for clarity, though depends on original source quality Binding Type Binding: N/A (Digital) Paper Type Paper: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: V8, SOHC Engine Code: M117 E50 Displacement: 4973 cc (5.0 Liters) Bore X Stroke: 96.0 mm x 85.0 mm Compression Ratio: 8.3:1 or 8.8:1 (depending on market/variant) Performance Horsepower Gross: 230 hp @ 4750 rpm (Euro spec) Torque Gross: 395 Nm (291 lb-ft) @ 3000 rpm (Euro spec) Fuel System Fuel Injection: Bosch CIS-E (Continuous Injection System - Electronic) Fuel Type: Premium Unleaded Gasoline (91+ Octane) 🔧 Transmission Standard Transmission Type: 4-speed automatic Transmission Code: 4G-Tronic Features Torque Converter Lockup: Yes 📐 Dimensions Exterior Length: 4960 mm (195.3 in) Width: 1820 mm (71.7 in) Height: 1385 mm (54.5 in) Wheelbase: 2800 mm (110.2 in) Weights Curb Weight: 1700 - 1800 kg (approx.) 🛡️ Safety Features Ratings Crash Testing Era: Pre-modern safety standards; focus on passive safety Active Features ABS: Anti-lock Braking System (optional on some models/markets) Passive Features Seatbelts: Three-point front seatbelts, rear seatbelts Structure: Reinforced passenger cell, crumple zones 💡 Technology Features Infotainment Audio System: Optional Becker premium audio systems, often with cassette player Driver Assistance Cruise Control: Standard or optional electronic cruise control Connectivity Phone Integration: None (era appropriate), but some may have had early car phone provisions Comfort Features Climate Control: Automatic climate control (optional/standard depending on trim) Seats: Power adjustable front seats with memory, heated seats (optional) 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000 km (6,000 miles) or 12 months Major Service: Refer to manual for specific mileage/time intervals for transmission fluid, coolant, etc. Fluid Specifications Engine Oil Type: API SF or SG, SAE 15W-40, 10W-40, or 5W-30 (depending on climate) Engine Oil Capacity: 7.5 Liters (approx. 8 US quarts) Transmission Fluid Type: MB 236.3 (e.g., Dexron II) Coolant Type: Ethylene glycol-based coolant (e.g., MB 325.0 specification, typically 50/50 mix with distilled water) Brake Fluid Type: DOT 3 or DOT 4 Known Issues Fuel System Aging: Degradation of fuel lines, O-rings, and injector seals due to age and fuel composition Electrical Component Failure: Aging wiring harnesses, vacuum leaks affecting K-Jetronic, failing relays Suspension Wear: Worn control arm bushings, ball joints, and shock absorbers Window Regulator Failure: Common wear item on power window mechanisms Headliner Sagging: Fabric degradation over time 📚 Vehicle History Brand Heritage Brand Legacy: Mercedes-Benz renowned for engineering, durability, and luxury since late 19th century Model Evolution Predecessor: W114/W115 Coupe, W123 Coupe Successor: C140 S-Class Coupe Production Production Years C126: 1981-1991 Production Years Covered: 1984, 1985 Manufacturing Location: Germany 🏆 Awards & Recognition Recognitions Brand Recognition: Mercedes-Benz consistently recognized for build quality and engineering excellence throughout this period.