🏷️ Basic Information Identification Make: Mercedes-Benz Model: 450SEL Chassis Code: W116 Model Years Covered: 1973-1980 Codes Engine Code: M117 👋 Introduction Market Position Positioning: The Mercedes-Benz W116 represented the pinnacle of luxury and engineering for its era, establishing the S-Class as a benchmark for executive sedans worldwide. The 450SEL, with its V8 engine, was a flagship model. Competitive Analysis Competitors: Competed against other high-end luxury sedans of the period such as BMW's E23 7 Series, Jaguar XJ, and Cadillac Fleetwood. Key Features Vehicle Highlight: The W116 was known for its robust build quality, superior ride comfort, advanced safety features for its time (including optional ABS), and sophisticated engineering, setting a new standard for automotive luxury. Manual Value Value Proposition: This comprehensive service manual is invaluable for owners and independent mechanics aiming to maintain, repair, and restore the iconic Mercedes-Benz W116 450SEL, ensuring its longevity and optimal performance. 📋 Manual Details Coverage Areas Primary Coverage: Full Service, Repair, and Workshop Procedures Region Specific Notes: Covers specifications relevant to models sold in major global markets during the specified production years. Page Count Estimated Pages: Hundreds of pages (exact count not specified, but described as 'hundreds' and 'very detailed') Manual Type Type: Factory Service Repair Workshop Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine: Engine mechanical, lubrication, cooling, fuel injection (Bosch K-Jetronic), ignition, exhaust, emissions control, engine management. Transmission: Automatic transmission (e.g., 4-speed 4G-Tronic) service, repair, overhaul, adjustments, troubleshooting. Drivetrain: Driveshafts, universal joints, differential, axle shafts, wheel bearings. Suspension: Front and rear suspension components, springs, shock absorbers, control arms, bushings, steering linkage. Brakes: Hydraulic system, brake boosters, master cylinder, calipers, brake pads, discs, parking brake, bleeding procedures. Steering: Power steering system, steering gearbox, steering column, tie rods, adjustments. Electrical: Battery, charging system (alternator), starting system, lighting, ignition system, instrumentation, power windows, central locking, air conditioning electricals, wiring diagrams. Body: Body shell, doors, hoods, trunk, windows, seals, exterior trim, interior trim, HVAC system (including body integration). HVAC: Air conditioning system operation, service, refrigerant handling, climate control unit, blower motor, heater core. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, tune-ups, fluid level checks and changes. Troubleshooting: Diagnostic procedures for common and complex issues across all vehicle systems. Repair: Step-by-step repair instructions for component removal, installation, and rebuilding. Disassembly Assembly: Detailed exploded diagrams and instructions for component disassembly and reassembly. Specifications: Torque specifications, clearances, fluid capacities, and other critical technical data. Engine Rebuild: Includes procedures for engine disassembly, inspection, repair, and reassembly, detailing component specifications and tolerances. Transmission Overhaul: Detailed steps for the removal, disassembly, repair, and installation of the automatic transmission, including torque converter and related components. Electrical Troubleshooting: Includes comprehensive wiring diagrams and diagnostic flowcharts for troubleshooting electrical system faults. Technical Depth Depth: Comprehensive coverage from basic preventative maintenance to in-depth engine and transmission overhauls. Suitable for professional mechanics and experienced DIY enthusiasts. 📊 Manual Specifications File Format Compatibility: Compatible with Windows and MAC operating systems. Accessibility: Usable on unlimited computers and devices; no expiry or renewal fees. Print Quality Printing Capability: Printable by the page or in its entirety. Binding Type Binding: Not applicable (PDF download) Paper Type Paper Quality: Not applicable (PDF download) Content Quality Diagram Quality: Contains hundreds of pages with detailed photos and diagrams, including highly detailed exploded diagrams crucial for repair procedures. ⚙️ Engine Specifications Primary Engine Engine Type: SOHC V8 Displacement: 4.5 Liters (4520 cc) Bore X Stroke: 92.0 mm x 85.0 mm Compression Ratio: 8.0:1 (or similar depending on market variant) Performance Horsepower Net: Approx. 220-230 hp (SAE net) at 5000 rpm (varies by market and specific year) Torque Net: Approx. 270-280 lb-ft (SAE net) at 3200 rpm (varies by market and specific year) Fuel System Fuel Injection: Bosch K-Jetronic mechanical fuel injection Fuel Type: Unleaded gasoline (premium octane recommended) Lubrication Oil Capacity: Approx. 8.0 US quarts (7.5 liters) with filter change (check manual for precise spec) Cooling Coolant Capacity: Approx. 12.0 US quarts (11.5 liters) (check manual for precise spec) Ignition Ignition System: Breakerless electronic ignition system 🔧 Transmission Standard Transmission Type: 4-speed automatic (e.g., 4G-Tronic) Optional Optional Transmission: Manual transmission was not commonly offered or available on the 450SEL in most markets. Features Transmission Fluid Type: Dexron II (or equivalent specification) Transmission Fluid Capacity: Approx. 2.5-3.0 US quarts (2.4-2.8 liters) for fluid change (check manual for precise spec) 📐 Dimensions Exterior Length: Approx. 5030 mm (198.0 in) Width: Approx. 1800 mm (70.9 in) Height: Approx. 1480 mm (58.3 in) Wheelbase: Approx. 3070 mm (120.9 in) Weights Curb Weight: Approx. 1700-1850 kg (3750-4080 lbs) (varies by equipment) Gross Vehicle Weight Rating: Approx. 2250 kg (4960 lbs) (check manual for precise spec) 🛡️ Safety Features Ratings Crash Test Data: While formal crash test ratings were less standardized during this period, the W116 was engineered with advanced safety structures, including...