🏷️ Basic Information Identification Make: Mercedes-Benz Model: 450SEL Product Name: Mercedes-Benz 450SEL 1973-1980 Factory Workshop Service Repair Manual Codes Chassis Code: W116 Engine Code: M117 👋 Introduction Market Position Positioning: Premium luxury sedan, representing the pinnacle of Mercedes-Benz engineering and comfort in its era. Competitive Analysis Competitors: BMW E12 5 Series, Jaguar XJ6 Series II, Cadillac Eldorado, Lincoln Continental Mark IV/V Key Features Vehicle Highlights: Spacious interior, advanced (for its time) safety features, powerful V8 engine, refined ride quality, extensive use of sound deadening. Manual Value Proposition Value: Provides access to the same factory-level information used by authorized technicians, enabling accurate and efficient maintenance and repair for enthusiasts and owners. 📋 Manual Details Coverage Areas Years Covered: 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980 Page Count Estimated Page Count: Extensive (Specific count not provided, but described as covering 'every service and repair imaginable') Manual Type Type: Factory Workshop Service Repair Manual Language Language: English (Assumed based on product description context) Format Digital Format: HTML/Flash menu with PDF 📖 Manual Coverage Systems Covered Powertrain: Engine, Transmission, Fuel System, Exhaust System Chassis: Suspension, Steering, Brakes, Drivetrain, Wheels and Tires Electrical: Ignition System, Charging System, Starting System, Lighting, Instruments, HVAC Electrical, Power Accessories Bodywork: Exterior Trim, Interior Trim, Seats, Doors, Glass, Body Panels, Paint Miscellaneous: HVAC System, Body Control Modules (if applicable for later years), Emissions Control Systems Procedures Included Maintenance: Oil changes, fluid flushes, filter replacements, tune-ups, lubrication Diagnostics: Troubleshooting common issues, fault code interpretation (if applicable), diagnostic procedures for all systems Repair: Engine rebuilds, transmission overhauls, brake system repair, suspension component replacement, electrical system repairs, body panel repair, interior component repair Special Procedures: Component removal and installation, calibration procedures, alignment specifications Technical Depth Depth: Comprehensive: From basic maintenance to complete engine and transmission rebuilds, including detailed diagnostic procedures and specifications. 📊 Manual Specifications File Format Format: HTML/Flash menu with PDF Compatibility: Windows (95/98/ME/XP/Vista/win7), Linux, MAC Print Quality Quality: High (Typical of factory manuals, designed for clarity and detail) Binding Type Binding: Digital (Downloadable file) Paper Type Paper Type: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Type: V8, SOHC Displacement: 4.5 Liters (4520 cc) Bore X Stroke: 92.0 mm x 84.0 mm Compression Ratio: 8.0:1 (typical) Horsepower Gross: Approx. 220-230 hp (depending on market and emissions regulations) Torque Gross: Approx. 270-280 lb-ft (depending on market and emissions regulations) Fuel System Injection System: Bosch K-Jetronic (CIS - Continuous Injection System) Fuel Type: Unleaded gasoline (minimum 91 octane recommended) Lubrication Oil Capacity Quarts: 7.7 quarts (7.3 liters) with filter change (refer to manual for exact specification) Recommended Oil Viscosity: SAE 10W-40 or 20W-50 (depending on climate, refer to manual) Cooling System Coolant Capacity Quarts: Approx. 10.5 quarts (10 liters) (refer to manual) Coolant Type: Ethylene glycol based coolant (50/50 mix with distilled water) 🔧 Transmission Standard Transmission Type: 3-speed Automatic (TorqueFlite variant by Mercedes-Benz) Transmission Model: 300 Automatic (often referred to by internal Mercedes designation) Optional Optional Transmission: None offered for 450SEL in this generation. Features Features: Hydraulic torque converter, planetary gear sets, electronic/vacuum modulator for shift control. Fluid Transmission Fluid Type: Dexron II (or equivalent approved fluid, refer to manual) Transmission Fluid Capacity Quarts: Approx. 3.3 quarts (3.1 liters) for torque converter refill, higher for complete overhaul (refer to manual). 📐 Dimensions Exterior Wheelbase Inches: 116.7 inches (2965 mm) Overall Length Inches: 199.6 inches (5070 mm) Overall Width Inches: 70.5 inches (1790 mm) Overall Height Inches: 57.3 inches (1455 mm) Weights Curb Weight Lbs: Approx. 3900 - 4200 lbs (1770 - 1905 kg) depending on equipment. Gross Vehicle Weight Rating Lbs: Approx. 4800 - 5000 lbs (2177 - 2268 kg) (refer to vehicle plate or manual). 🛡️ Safety Features Ratings Crash Test Data: No standardized crash test ratings like NHTSA exist for vehicles of this era. However, Mercedes-Benz was a leader in passive safety design for its time. Active Features Braking System: Power-assisted hydraulic disc brakes front and rear, ABS (Anti-lock Braking System) became available on later models within this range (e.g., from 1978 onwards). Steering System: Power recirculating ball steering. Passive Features Occupant Protection: Reinforced safety cage, impact-absorbing steering column, padded dashboard and interior surfaces, three-point seatbelts (front standard, rear optional or standard depending on market/year). Lighting: Halogen headlights, integrated fog lamps (often optional or part of European spec). 💡 Technology Features Infotainment Audio System: Factory AM/FM radio with cassette player. Optional upgraded sound systems may have been available. Speakers: Typically 4-6 speakers depending on configuration. Driver Assistance ABS: Anti-lock Braking System (ABS) available on later models (e.g., from 1978 onwards). Not standard on all vehicles in this range. Connectivity Connectivity Features: None in the modern sense (no Bluetooth, USB, etc.). Comfort Features Climate Control: Automatic climate control (Thermatic) was a key feature, offering sophisticated temperature regulation for its time. Power Accessories: Power windows, power door locks, power antenna,...