🏷️ Basic Information Identification Make: Mercedes-Benz Model: 500 SEC Model Code: C126 Chassis Code: C126 Generation Generation Designation: First Generation (C126) Codes Engine Code: M117 👋 Introduction Market Position Market Position: The Mercedes-Benz 500 SEC represented the pinnacle of personal luxury coupes in the mid-1980s, offering unparalleled comfort, performance, and sophisticated engineering. Positioned as a grand tourer for the discerning individual, it competed with other high-end luxury coupes of its era. Competitive Analysis Competitive Analysis: Competed directly with models like the BMW 6 Series (E24) and potentially higher-trim Jaguar XJ-S models, emphasizing a blend of performance and refined luxury. Key Features Key Features: Powerful V8 engine, luxurious interior appointments, advanced safety features for its time (e.g., optional ABS), elegant coupe styling, and the renowned Mercedes-Benz build quality and engineering. 📋 Manual Details Coverage Areas Manual Coverage: Comprehensive factory service and repair for 1984-1985 Mercedes-Benz 500 SEC (C126) Page Count Page Count: Estimated 1000+ pages (typical for full factory service manuals of this era) Manual Type Manual Type: Service Repair Manual Language Language: English Format Format: Downloadable Digital Format (PDF recommended for searchability and usability) 📖 Manual Coverage Systems Covered Systems Covered: Engine Mechanical, Engine Fuel System (Bosch K-Jetronic), Engine Electrical System, Ignition System, Cooling System, Lubrication System, Exhaust System, Transmission (Automatic), Drivetrain, Suspension System (Front & Rear), Steering System, Brake System (Hydraulic & ABS), Electrical Systems (Lighting, Instrumentation, Comfort Features), Climate Control System, Body & Chassis, Interior Trim, Wheels & Tires, Diagnostic Procedures Procedures Included Procedures Included: Routine Maintenance, Scheduled Servicing, Component Removal & Installation, Overhaul Procedures, Troubleshooting Guides, Diagnostic Flowcharts, Repair Procedures, Adjustment Specifications, Torque Specifications, Wiring Diagrams, Exploded Views Technical Depth Technical Depth: Deep technical detail suitable for professional technicians and advanced DIY enthusiasts, covering from basic adjustments to full engine and transmission rebuilds. 📊 Manual Specifications File Format File Format: PDF (Portable Document Format) - Optimized for readability and search functionality. Print Quality Print Quality: High-resolution scans ensuring clarity of diagrams, illustrations, and text. Allows for clear printing of individual pages or sections. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: V8 SOHC Engine Displacement: 5.0 Liters (4973 cc) Engine Code Identifier: M117 E50 Performance Horsepower: Approx. 230-240 hp (depending on market and specific tuning) Torque: Approx. 280-300 lb-ft (depending on market and specific tuning) Fuel System Fuel Injection System: Bosch CIS-E (Continuous Injection System with Electronic Control) Fuel Type: Premium Unleaded Gasoline Engine Details Bore X Stroke: 92.0 mm x 92.4 mm Compression Ratio: 8.3:1 Lubrication Oil Capacity With Filter: 8.0 Liters (8.5 US Quarts) Recommended Oil Viscosity: SAE 15W-40 or SAE 20W-50 (refer to manual for specific climate and usage recommendations) 🔧 Transmission Standard Transmission Type: 4-Speed Automatic (4G-TRONIC) Optional Optional Transmission: None offered for this model and year range. Features Transmission Features: Lock-up torque converter for improved fuel efficiency at cruising speeds. Electronic control for shift points. Fluid Specifications Transmission Fluid Type: MB 236.1 (e.g., Dexron II or equivalent) Transmission Fluid Capacity: Approx. 2.0 Liters (4.2 US Quarts) for change, 8.0 Liters (8.5 US Quarts) for overhaul. 📐 Dimensions Exterior Length: Approx. 4,960 mm (195.3 in) Width: Approx. 1,820 mm (71.7 in) Height: Approx. 1,390 mm (54.7 in) Wheelbase: Approx. 2,850 mm (112.2 in) Weights Curb Weight: Approx. 1,700 kg (3,748 lbs) Gross Vehicle Weight Rating: Approx. 2,200 kg (4,850 lbs) 🛡️ Safety Features Ratings Safety Ratings: No formal crash test ratings (like NHTSA/Euro NCAP) existed in the same format as today, but Mercedes-Benz was known for robust construction and advanced passive safety features for its era. Active Features Active Safety Features: Optional Anti-lock Braking System (ABS) - a significant safety advancement at the time. Passive Features Passive Safety Features: Reinforced passenger cell, energy-absorbing steering column, dual-circuit hydraulic brakes, front and rear crumple zones, safety belts with front pre-tensioners (late models/optional). Airbag Availability: Driver's side airbag was introduced in later C126 models, but may not be standard or available on early 1984-1985 units. 💡 Technology Features Infotainment Infotainment Features: Analog radio with cassette player, power antenna, manual climate control with optional automatic climate control. Limited by era. Driver Assistance Driver Assistance Features: ABS (Anti-lock Braking System) was the primary advanced driver assistance feature available. Connectivity Connectivity Options: N/A (No integrated Bluetooth, USB, or smartphone connectivity). Comfort Features Comfort Features: Power-adjustable front seats with memory, power windows, power locks, cruise control, automatic climate control (optional), heated seats (optional), electric sunroof (optional). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 7,500 - 10,000 miles or 12 months, whichever comes first (refer to manual for precise intervals based on driving conditions). Major Service Interval: Significant checks and component replacements usually scheduled around 30,000, 60,000, and 100,000 miles. Fluid Specifications Coolant Type: Mercedes-Benz Specification 325.0 (Ethylene Glycol based, typically a 50/50 mix with distilled...