🏷️ Basic Information Identification Make: Mercedes-Benz Model: W116 300 SD Production Years Covered: 1978, 1979, 1980 Codes Chassis Code: W116 👋 Introduction Market Position Target Audience: Mechanical technicians and knowledgeable Mercedes-Benz owners. Competitive Analysis Value Proposition: Enables DIY repairs, saving costs, and building a reputation for quality service. Key Features Accuracy: Endeavored to ensure the accuracy of information. Completeness: Complete service manual containing all necessary repair instructions. Warnings Cautions: Includes specific emphasis on WARNING, CAUTION, and NOTE. 📋 Manual Details Coverage Areas Primary Coverage: Service and repair procedures for Mercedes-Benz W116 300 SD models. Secondary Coverage: Routine maintenance, diagnostics, overhaul, and special tool identification. Page Count Estimated Page Count: Comprehensive (Exact number not specified, but implied to be extensive for a workshop manual) Manual Type Type: Workshop Service Manual / Repair Manual Language Language: English Format Format: PDF (Electronic) 📖 Manual Coverage Systems Covered Engine: Detailed repair, overhaul, tune-ups, lubrication system. Fuel System: Comprehensive coverage including fuel injection and delivery. Ignition System: Diagnosis and repair of ignition components. Exhaust System: Repair and maintenance of the exhaust system. Electrical System: Wiring diagrams, component testing, troubleshooting. Transmission: Engine and transmission disassembly and overhaul. Bodywork: Procedures for body repair and maintenance. Brakes: Disc brakes front and rear, hydraulic system, ABS (optional on later models). Suspension: Independent front suspension, semi-trailing arm rear suspension, shock absorbers, springs. Steering: Recirculating ball steering system, power steering. Cooling System: Radiator, water pump, thermostat, hoses. Procedures Included Maintenance: Routine maintenance, tune-ups, fluid changes. Repair: Diagnostic and repair procedures for common and complex issues. Overhaul: Complete engine and transmission overhaul procedures. Installation Removal: Removal and installation instructions for major components. Assembly Disassembly: Detailed assembly and disassembly sequences. Troubleshooting: Diagnostic procedures for various system faults. Technical Depth Depth: Advanced diagnostics and repair, mirroring authorized dealer service departments. Special Instructions: Emphasis on special aspects of the product, including proprietary components. Special Tools: Identification and usage of required Mercedes-Benz special tools. 📊 Manual Specifications File Format Format: PDF Deliverability: Fast and Free Electronic Delivery via Email Searchability: PDF format typically allows for text searching (if text-based). Print Quality Printable: Yes Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Code: OM617 (Inline 5-cylinder Diesel) Displacement: 3.0 Liters (2998 cc) Aspiration: Naturally Aspirated Performance Horsepower: Approx. 80-87 hp (Varies slightly by model year/region) Torque: Approx. 130-140 lb-ft (Varies slightly by model year/region) Fuel System Injection Type: Bosch Inline Fuel Injection Pump Fuel Type: Diesel 🔧 Transmission Standard Transmission Type: 4-speed Automatic Transmission (3-speed manual was rare/not common for 300 SD) Features Transmission Fluid: Refer to manual for specific MB fluid specification (e.g., Dexron II or equivalent) 📐 Dimensions Exterior Body Style: 4-door Sedan Wheelbase: 119.1 inches (3025 mm) Length: 195.7 inches (4970 mm) Weights Curb Weight: Approx. 3800-4000 lbs (1725-1815 kg) 🛡️ Safety Features Passive Features Seat Belts: Standard seat belts Crumple Zones: Designed with energy-absorbing crumple zones. Reinforced Cabin: Strong safety cage construction. 💡 Technology Features Infotainment Radio: Typically analog radio with AM/FM, optional cassette player. Climate Control System: Manual or optional automatic climate control (Thermatic). Driver Assistance Cruise Control: Optional cruise control system. 🔧 Maintenance Service Intervals Oil Change Interval: Typically 3,000-5,000 miles or 6 months, but consult manual for precise recommendations. Fuel Filter Replacement: Recommended at regular intervals, specific mileage/time per manual. Fluid Specifications Engine Oil Type: Refer to manual for viscosity grade (e.g., 15W-40 or 10W-40 Diesel specific) Coolant Type: Ethylene Glycol based, 50/50 mix with distilled water. Known Issues Diesel Glowing Plugs: Proper functioning of glow plugs is critical for cold starts. Vacuum System: Aging vacuum lines can lead to issues with central locking, climate control, etc. Rust Prone Areas: Wheel arches, rocker panels, and door bottoms are common rust areas. Automatic Transmission Longevity: Proper fluid changes are essential for the longevity of the automatic transmission. 📚 Vehicle History Brand Heritage Brand Focus: Pioneering luxury automobiles and diesel technology. Model Evolution W116 Introduction: The first Mercedes-Benz S-Class generation, introduced in 1972. 300 Sd Significance: The 300 SD was a key model in introducing Mercedes-Benz diesel luxury sedans to the North American market. Production Manufacturing Location: Germany 🏆 Awards & Recognition Recognitions Historical Acclaim: The W116 generation as a whole is recognized as a significant milestone in automotive luxury and engineering, setting the standard for modern luxury sedans.