🏷️ Basic Information Identification Make: Mercedes-Benz Model: 450 SEL Chassis Code: W116 Model Years Covered: 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980 Engine Designation: M117 Codes Vin Code Engine: M117 (V8) 👋 Introduction Market Position Target Audience: Mercedes-Benz W116 450 SEL owners, enthusiasts, mechanics, and restoration specialists. Value Proposition: Empowers owners to perform their own servicing and repairs, saving significant labor costs ($50-$60 per hour) and providing factory-level knowledge. Competitive Analysis Differentiation: Distinguished as a COMPLETE, ACTUAL GENUINE FACTORY SERVICE REPAIR MANUAL, not a third-party reproduction or simplified guide. Key Features Comprehensiveness: Covers all aspects of repair and maintenance with unparalleled detail and factory accuracy. Usability: Searchable PDF format allows for quick information retrieval and printing of specific pages, enhancing user experience. 📋 Manual Details Coverage Areas Primary Coverage: Complete factory service and repair for Mercedes-Benz W116 450 SEL Secondary Coverage: General maintenance, troubleshooting, diagnostics, component repair, system overviews Page Count Estimated Pages: Hundreds of pages (exact count not specified, but implied to be comprehensive) Manual Type Type: Factory Service Repair Manual Authenticity: Genuine Factory Manuals (NOT 3rd party) Content Type: Repair, Service, Maintenance, Troubleshooting, Diagnostics, Electrical Diagrams Language Language: English Format Digital Format: PDF Download Printability: Fully printable (entire manual or selected pages) Delivery Method: Instant download link provided on checkout page after payment 📖 Manual Coverage Systems Covered Engine Service Repair: Comprehensive engine service, repair, rebuild, and tuning procedures Transmission Service Repair: Detailed service and repair for the transmission system Brake System: Complete coverage of brake system maintenance, repair, and diagnostics Wiring Diagrams: Detailed electrical system wiring diagrams Electrical System: In-depth coverage of the electrical system, including troubleshooting and repair Suspension: Service and repair of the suspension system Steering: Repair and maintenance of the steering system Cooling System: Maintenance and repair of the cooling system Fuel Injection Fuel System: Coverage of fuel injection and fuel system components and servicing Emission System: Details on emission control system maintenance and repair Heater Air Conditioning: Service and repair for the HVAC system Engine Control System: Information on engine management and control systems Chassis Body: Coverage of chassis and bodywork related repairs and maintenance Restraint System: Information pertaining to the vehicle's restraint systems Interior: Procedures for interior component service and repair Differential Drive: Service and repair of the differential and drive components Axle: Coverage of axle servicing and repair All Styles Covered: The manual covers all available styles and configurations for the W116 450 SEL within the specified model years. Procedures Included General Maintenance: Detailed general maintenance procedures and schedules Troubleshooting: Advanced troubleshooting guide for diagnosing and correcting problems Periodic Lubrication: Guidance on periodic lubrication points and fluid types Technical Depth Depth: Complete, in-depth coverage for all diagnostic and repair procedures, enabling DIY repairs and professional-level understanding. Detail Level: Step-by-step instructions, detailed substeps, notes, cautions, warnings, and numbered instructions. Visual Aids: Includes all necessary illustrations, diagrams, photos, and enlarged inset views for detailed part examination. 📊 Manual Specifications File Format Format: PDF Compatibility: Works on all PC-based Windows operating systems and Mac. Storage: Can be saved to hard drive or burned to CD-ROM. Print Quality Resolution: High resolution for clear viewing and printing of diagrams and text. Binding Type Binding: N/A (Digital download, user prints as needed) Paper Type Paper Type: N/A (Digital download, user chooses paper type for printing) Requirements Software: Adobe PDF Reader required for viewing. ⚙️ Engine Specifications Primary Engine Engine Type: V8 SOHC (Single Overhead Camshaft) Engine Code: M117 Displacement: 4.5 Liters (4520 cc / 275.9 cubic inches) Performance Horsepower Approximate: Approximately 220-230 hp (SAE Gross) depending on year and market specifications. Torque Approximate: Approximately 270-280 lb-ft (SAE Gross) depending on year and market specifications. Fuel System Fuel Delivery: Bosch K-Jetronic Mechanical Fuel Injection (Continuous Injection System - CIS) Fuel Type: Unleaded gasoline (minimum 91 octane recommended for optimal performance and longevity, though leaded fuel was common at the time of manufacture). Engine Components Block Material: Cast Iron Head Material: Aluminum Alloy 🔧 Transmission Standard Transmission Type: 3-speed Automatic Transmission (e.g., 3HP20 or successor) Optional Manual Transmission Availability: Not typically offered or extremely rare for the 450 SEL model. Features Transmission Fluid Type: Dexron III (or equivalent specified fluid, check manual for exact MB specification, e.g., MB 236.1). 📐 Dimensions Exterior Wheelbase: Approximately 2965 mm (116.7 inches) Length: Approximately 5050 mm (198.8 inches) Width: Approximately 1800 mm (70.9 inches) Height: Approximately 1420 mm (55.9 inches) Weights Curb Weight: Approximately 1750-1850 kg (3858-4079 lbs), varies with equipment. 🛡️ Safety Features Ratings Crash Test Information: Era-specific safety features; detailed modern crash test ratings are not applicable to this generation. Active Features Braking System: Four-wheel disc brakes (ventilated front discs), hydraulic power-assisted, dual-circuit system. Later models may have ABS (Anti-lock Braking System) as an option. Steering System: Recirculating ball with hydraulic power assist. Passive Features Body Structure: Reinforced safety cage,...