🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300 SD Turbo Generation: W126 Chassis Code: W126 Product Name: Mercedes 300 SD Turbo 1981-1985 Service Repair Manual 👋 Introduction Market Position Target Audience: Mercedes-Benz 300 SD Turbo owners and independent mechanics seeking detailed repair and maintenance guidance. Competitive Analysis Value Proposition: Provides comprehensive, year-specific service information for a critical period of the W126 chassis diesel models, essential for maintaining these robust vehicles. Key Features Key Features: Covers multiple model years, detailed diagnostic and repair procedures, component inspection guidelines, fluid specifications, and troubleshooting tips. 📋 Manual Details Coverage Areas Model Years Covered: 1981, 1982, 1983, 1984, 1985 Page Count Estimated Page Count: Comprehensive (Specific page count not provided, but typical for a multi-year, multi-model service manual collection) Manual Type Manual Type: Service and Repair Manual Language Language: English Format File Format: PDF / WINRAR 📖 Manual Coverage Systems Covered Engine Systems: Engine disassembly, inspection, rebuilding, component condition, oil & filter change, valve clearance adjustment, injection timing, fuel system, air intake, cooling system, V-belts, exhaust system Transmission Systems: Manual transmission oil change & level checks, Automatic transmission fluid & filter change, fluid level checks, transfer case fluid change & level checks Suspension And Steering: Suspension and body structure inspection, self-leveling suspension, level control (ADS, ASD, 4MATIC) fluid level, front axle oil level, rear axle oil change & level, ball joints, steering play, steering bolts, throttle linkage Brake Systems: Brake fluid level, brake lines, brake pads & disk thickness, brake disks, parking brake cable & adjustment, brake fluid replacement, parking brake check Electrical Systems: Warning & indicator lamps, battery fluid level, antenna mast, headlamp & exterior lamp inspection, windshield wiper & washer system Body And Chassis: Water leakage & corrosion inspection, wheel inspection & tightening, drive shaft flexible coupling, lower noise encapsulation panels, engine compartment lower panel removal/installation, door hinges & locks lubrication, sunroof maintenance, soft top checks, body paint damage inspection Climate Control: AC refrigerant charge, dust filter replacement, active charcoal filter replacement, recirculating air filter replacement, windshield washer fluid level Procedures Included Maintenance Procedures: Routine fluid changes (oil, coolant, transmission, axle), filter replacements (oil, fuel, air, dust), belt inspections, spark plug checks, tire pressure adjustment, lubrication points Diagnostic Procedures: Troubleshooting vehicle problems, component condition inspection, line and hose inspection, suspension inspection, corrosion inspection, idle speed adjustment, injection timing checks Repair Procedures: Disassembly, inspection of parts for reuse, rebuilding, assembly of components, fuel filter replacement, air filter replacement, oxygen sensor replacement, spark plug replacement, coolant replacement, engine mount adjustment, clutch disk wear check, brake fluid replacement Technical Depth Technical Depth: Comprehensive; covers basic maintenance to component rebuilding and diagnostic procedures for mechanics and knowledgeable DIY enthusiasts. 📊 Manual Specifications File Format File Format: PDF / WINRAR Print Quality Print Quality: Digital (High resolution, printable) Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Compatibility Operating Systems: Win95/98/ME/XP/vista/7/8/Linux/MAC, IOS, Android Delivery Delivery Method: Instant Download ⚙️ Engine Specifications Primary Engine Engine Code: OM617.951 Engine Type: Inline 5-cylinder, turbocharged diesel Performance Displacement: 3.0 Liters (2998 cc) Horsepower Approx: 123 hp @ 4350 rpm (varies slightly by year and specific output) Torque Approx: 184 lb-ft (249 Nm) @ 2400 rpm (varies slightly by year and specific output) Fuel System Fuel Injection System: Bosch inline injection pump with mechanical governor Recommended Fuel: Diesel fuel Maintenance Valve Adjustment Interval: Typically every 10,000-15,000 miles or as specified in the manual. Injection Timing Adjustment: As needed, especially after fuel system work or if performance issues arise. Technical Notes Glow Plugs: Essential for cold starting; manual covers inspection and replacement. 🔧 Transmission Standard Transmission Type: 4-speed automatic (common), 5-speed manual (less common for SD Turbo models, but covered in general W126 manuals) Features Automatic Transmission Model: 722.3 (e.g., 722.303) Maintenance Automatic Transmission Fluid Type: Dexron III (or equivalent specification as per Mercedes-Benz) Automatic Transmission Fluid Capacity: Approximately 7-8 liters for a complete fluid and filter change (refer to manual for exact capacity). Manual Transmission Oil Type: GL-4 or GL-5 gear oil (specific viscosity recommended in manual) 📐 Dimensions Exterior Wheelbase: 112.6 inches (2860 mm) Weights Curb Weight Approx: 3,700 - 3,900 lbs (1678 - 1769 kg) Gross Vehicle Weight Rating Approx: 4,850 lbs (2200 kg) 🛡️ Safety Features Ratings NHTSA Rating: Not directly comparable to modern standards; known for robust construction. Passive Features Passive Safety: Reinforced passenger cell, energy-absorbing steering column, safety belts. 💡 Technology Features Infotainment Infotainment Features: Analog radio, cassette player (manual mentions cleaning tone head). Driver Assistance Driver Assistance Features: ABS (Anti-lock Braking System) became available later in the W126 run, but not standard on early SD models. Level control systems (ADS, ASD) were also optional and covered. 🔧 Maintenance Service Intervals Engine Oil Change Interval: Every 3,000-5,000 miles or 6-12 months, depending on driving conditions (refer to manual for specific recommendations). Fuel Filter...