🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300SD Chassis Code: W126 Model Years Covered By Manual: 1981-1985 Generation Generation Name: First Generation W126 S-Class 👋 Introduction Market Position Positioning: The Mercedes-Benz 300SD (W126) was positioned as a luxury diesel sedan, offering exceptional build quality, comfort, and fuel efficiency in its era. Competitive Analysis Competitors: Competed against other premium sedans of the early 1980s, though its diesel powertrain offered a unique value proposition in terms of economy and torque. Key Features Powertrain Offering: Renowned for its robust and economical 3.0-liter turbocharged inline-five-cylinder diesel engine (OM617). Design Philosophy: Embodied Mercedes-Benz's commitment to engineering excellence, safety, and long-term durability. Manual Value Proposition: Provides factory-level repair and maintenance information, essential for preserving the integrity and value of a classic Mercedes-Benz. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive factory service and repair for Mercedes-Benz 300SD (W126 chassis) Page Count Estimated Page Count: Extensive (typical factory manuals exceed 1000 pages when compiled digitally) Manual Type Type: Factory Workshop Service Repair Manual Language Language: English Format Format: HTML/Flash Menu with PDF Compatibility Operating Systems: Windows 95/98/ME/XP/Vista/Win7, Linux, MAC 📖 Manual Coverage Systems Covered Engine: Detailed diagnosis, repair, overhaul, and specifications for the OM617 diesel engine. Fuel System: Injection pump, injectors, fuel lines, filters, glow plug system. Cooling System: Radiator, water pump, thermostat, hoses, fan clutch, coolant specifications. Lubrication System: Oil pump, oil pan, oil filter, oil specifications and capacities. Ignition System: Glow plug system operation and testing. Exhaust System: Manifolds, catalytic converter (if applicable), muffler, pipe replacement and repair. Transmission: Automatic transmission (e.g., 722.3) diagnosis, repair, fluid changes, seal replacement, torque converter. Drivetrain: Drive shafts, universal joints, differential, axle shafts. Brakes: Hydraulic system, brake lines, master cylinder, calipers, brake pads, rotors, parking brake, ABS (if equipped). Suspension: Front and rear suspension components, shock absorbers, springs, control arms, bushings, steering linkage. Steering: Power steering system, steering gear, steering column, tie rods, alignment specifications. Electrical System: Battery, alternator, starter, wiring diagrams, fuses, relays, lighting system, ignition switch. Climate Control: HVAC system, blower motor, heater core, evaporator, refrigerant, controls, vacuum lines. Body And Interior: Body panels, doors, windows, locks, seats, upholstery, dashboard, interior trim, convertible top (if applicable). Body Electrical: Power windows, power locks, mirrors, seat adjustment motors, central locking, cruise control. Chassis And Frame: Frame construction, body mounting, rust prevention, jacking points. Diagnostic Troubleshooting: Systematic diagnostic procedures for common and uncommon issues. Procedures Included Maintenance: Oil changes, filter replacements, fluid level checks and top-offs, brake fluid flush, spark plug replacement (if applicable), tune-ups. Repair: Engine component replacement (e.g., water pump, alternator), transmission service, brake system overhaul, suspension component replacement, power steering pump replacement. Overhaul: Complete engine rebuild procedures, transmission rebuilding instructions, differential overhaul. Troubleshooting: Step-by-step diagnostic flowcharts for various symptoms (e.g., poor starting, engine noise, braking issues). Special Tools: Identification and usage of specialized tools required for specific repair procedures. Torque Specifications: Precise torque values for all critical fasteners. Alignment Specifications: Wheel alignment parameters for optimal handling and tire wear. Wiring Diagrams: Detailed electrical schematics for all vehicle systems. Technical Depth Depth: Comprehensive, covering from basic preventative maintenance to full engine and transmission rebuilds. Diagnostic Capability: Advanced diagnostics with troubleshooting trees and component testing procedures. Assembly Disassembly: Detailed step-by-step instructions for component removal, installation, and reassembly. 📊 Manual Specifications File Format Primary Format: PDF Navigation: HTML/Flash Menu for easy access to sections. Searchability: Likely text-searchable within PDF documents for keywords. Print Quality Quality: High-resolution PDF ensuring clarity of diagrams and text. Binding Type Binding: Digital (No physical binding) Paper Type Paper Type: Not applicable (Digital format) ⚙️ Engine Specifications Primary Engine Engine Code: OM617.951 (Turbocharged Diesel) Engine Type: Inline 5-cylinder, turbocharged, indirect injection diesel Displacement: 3.0 Liters (2998 cc) Performance Horsepower: Approximately 123 hp @ 4350 rpm Torque: Approximately 200 lb-ft (271 Nm) @ 2400 rpm Fuel System Injection System: Bosch inline injection pump with mechanical governor and turbocharger. Fuel Type: Diesel fuel Coolant Capacity Coolant Capacity: Approximately 10.0 Liters (2.6 Gallons) Oil Capacity Oil Capacity With Filter: Approximately 8.0 Liters (8.5 Quarts) 🔧 Transmission Standard Transmission Type: 4-speed automatic transmission (e.g., 722.3) Optional Optional Transmission: Manual transmission not typically offered on the 300SD model. Features Transmission Features: Lock-up torque converter for improved highway efficiency. Fluid Specifications Automatic Transmission Fluid: Mercedes-Benz Transmission Fluid (MB 236.1) or equivalent Dexron-III/Mercon. 📐 Dimensions Exterior Length: Approx. 5000 mm (196.9 inches) Width: Approx. 1798 mm (70.8 inches) Height: Approx. 1438 mm (56.6 inches) Weights Curb Weight: Approx. 1700 kg (3748 lbs) Gross Vehicle Weight Rating: Approx. 2200 kg (4850 lbs) 🛡️ Safety Features Ratings Safety Standards Era: Designed to meet or exceed safety standards of the early 1980s, emphasizing passive safety. Active Features ABS: Anti-lock Braking System (ABS) was available as an option on later models within this range. Passive Features Construction: Reinforced chassis and body structure, crumple zones, safety-cage construction. Airbags:...