🏷️ Basic Information Identification Make: Mercedes-Benz Model: W116 450 SE / SEL Model Codes: 450 SE, 450 SEL Generation Generation Designation: First Generation W116 👋 Introduction Market Position Luxury Segment: The W116 was Mercedes-Benz's flagship luxury sedan during its production run, competing with other high-end European manufacturers. Competitive Analysis Competitors: Primary competitors included models from BMW (e.g., 7 Series), Jaguar (e.g., XJ), and other premium European luxury marques. Key Features Design Philosophy: The W116 embodied Mercedes-Benz's commitment to engineering excellence, safety, comfort, and durability, featuring a sophisticated and understated design. Innovation: Introduced significant safety innovations for its time, including crumple zones and a robust passenger safety cell. 📋 Manual Details Coverage Areas Applicable Years: 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980 Page Count Estimated Page Count: > 10000 Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Comprehensive coverage of the M117 V8 engine, including its M-Jet fuel injection system. Transmission: Detailed procedures for the automatic transmission (e.g., 3-speed automatic transmission). Drivetrain: Rear-wheel drive system, including driveshaft, differential, and axle components. Suspension: Front and rear suspension systems, including shock absorbers, springs, control arms, and bushings. Brakes: Hydraulic brake system, including disc brake systems (front and rear), master cylinder, brake lines, and calipers. Steering: Power steering system, including steering gear, pump, and steering linkage. Electrical: Comprehensive electrical system coverage, including battery, alternator, starter, ignition system, lighting, instrumentation, and wiring diagrams. Fuel: Fuel delivery system, including fuel pump, fuel lines, fuel filter, and fuel tank. Cooling: Engine cooling system, including radiator, water pump, thermostat, and coolant hoses. Exhaust: Exhaust system components, including manifold, catalytic converter (where applicable), mufflers, and pipes. Body And Chassis: Body panel removal and installation, structural components, doors, windows, and interior trim. Procedures Included Maintenance: Routine maintenance procedures such as oil changes, filter replacements, fluid checks, and tune-ups. Troubleshooting: Extensive troubleshooting guides for various systems, including diagnostic procedures and common fault diagnosis. Repair: Detailed step-by-step repair instructions for virtually all vehicle components and systems. Disassembly And Assembly: Comprehensive instructions for the removal, disassembly, cleaning, inspection, reassembly, and installation of components. Adjustments: Precise instructions for adjustments to engine timing, carburetor/fuel injection, brakes, clutch (if applicable), and other systems. Specifications: Inclusion of all critical service data, including torque specifications, fluid capacities, clearances, and wear limits. Technical Depth Depth: Factory-level technical detail, covering everything from basic adjustments to complete engine and transmission overhauls. Visual Aids Illustrations: Abundant pictorial diagrams, exploded views, drawings, and photographs to guide repair procedures. Special Tools Tool References: Identification and usage instructions for specialized service tools required for specific repair operations. 📊 Manual Specifications File Format Format: Portable Document Format (PDF) Print Quality Printability: Fully printable, allowing users to print specific sections or the entire manual. Binding Type Digital Binding: N/A (Digital download) Paper Type Digital Paper Quality: N/A (Digital download) Software Requirement Reader: Adobe Reader or compatible PDF viewer required. Compatibility Operating Systems: Compatible with Windows, Mac, and Linux operating systems. Completeness Content Status: 100% complete and intact, with no missing or corrupt pages/sections. ⚙️ Engine Specifications Primary Engine Engine Type: V8, SOHC Engine Code: M117 Displacement: 4520 cc (4.5 Liters) Bore X Stroke: 92.0 mm x 85.0 mm Performance Horsepower Approx: 220-230 hp (SAE Gross, depending on market and exact specification) Torque Approx: 370-380 Nm (SAE Gross, depending on market and exact specification) Fuel System Fuel Injection: Bosch M-Jet (Mechanical Fuel Injection) Fuel Type: Unleaded gasoline Cooling Cooling System Type: Water-cooled 🔧 Transmission Standard Transmission Type Standard: 3-speed Automatic Transmission Optional Transmission Type Optional: Rarely, a 4-speed manual transmission was available in some markets, though highly uncommon. Features Torque Converter: Equipped with a torque converter for smooth power delivery. 📐 Dimensions Exterior Wheelbase: 2935 mm (115.6 inches) for SE, 3075 mm (121.1 inches) for SEL Length: Approx. 5000-5140 mm (197-202 inches) depending on SE/SEL and specific bumper design. Width: Approx. 1800-1810 mm (70.9-71.3 inches) Height: Approx. 1450-1460 mm (57.1-57.5 inches) Weights Curb Weight Approx: Approx. 1700-1800 kg (3750-3970 lbs) depending on model and equipment. 🛡️ Safety Features Ratings Historical Safety Perception: Highly regarded for safety due to robust construction and engineering principles of the era. Active Features ABS: Anti-lock Braking System (ABS) became available as an option in later years of the W116 production, particularly from 1978 onwards. Passive Features Body Structure: Reinforced passenger compartment, energy-absorbing steering column, and impact-absorbing bumpers. Seat Belts: Three-point seatbelts for front occupants were standard, with rear belts often optional or standard depending on market. 💡 Technology Features Infotainment Radio System: Typically featured AM/FM radio and cassette player systems, often with optional power antenna. Driver Assistance Cruise Control: Optional cruise control system available on many models. Comfort Features Climate Control: Sophisticated (for the era) automatic climate control system with air conditioning was often a feature. 🔧 Maintenance Service Intervals...