🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Engine Code: OM617.95 Turbo Diesel Body Style: Sedan, Coupe, Wagon, Limousine (covered by model series, specific body style details not explicitly detailed in product info) Generation Generation: First Generation (1976-1985) Codes Chassis Code: W123 👋 Introduction Market Position Market Position: A comprehensive technical resource catering to owners and mechanics of the Mercedes-Benz W123 series equipped with the OM617.95 Turbo Diesel engine, offering dealership-level repair and maintenance information for a classic luxury vehicle. Competitive Analysis Competitive Analysis: This manual provides official factory repair data, distinguishing it from generic repair guides. Its focus on the specific OM617.95 turbo diesel engine and the W123 chassis offers a level of detail and accuracy crucial for servicing this particular model, making it indispensable for enthusiasts and professionals alike. Key Features Key Features: Official factory information, comprehensive coverage of all major vehicle systems, detailed troubleshooting guides, high-quality printable PDF format, instant download accessibility, specific focus on the OM617.95 Turbo Diesel engine. 📋 Manual Details Coverage Areas Coverage Areas: General Maintenance, Troubleshooting, Engine Service/Repair, Transmission Service/Repair, Brake System, Wiring Diagram, Electrical System, Suspension, Periodic Lubrication, Steering, Cooling System, Fuel Injection, Fuel System, Emission System, Heater/Air Conditioning, Engine Control System, Chassis/Body, Restraint System, Interior, Differential/Drive, Axle, and much more. Page Count Page Count: Hundreds or thousands of pages (printable at great quality) Manual Type Manual Type: Official Full Complete Factory Service Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Systems Covered: Engine (OM617.95 Turbo Diesel), Drivetrain (Transmission, Differential/Drive, Axle), Braking System, Electrical System (including Wiring Diagrams), Fuel System (including Fuel Injection), Cooling System, Lubrication System, Steering System, Suspension System, HVAC System (Heater/Air Conditioning), Emission Control System, Chassis, Body, Restraint System (Airbags, Seatbelts), Interior Components. Cooling System Details: Radiator, fan (mechanical), water pump, thermostat, hoses, coolant passages, heater core, and climate control linkage. Fuel Injection Details: Bosch inline injection pump, injectors, fuel lines, pre-heating system, injection timing adjustments. Electrical System Details: Battery, starter, alternator, ignition system (for gasoline variants, but this manual focuses on diesel), lighting (headlights, taillights, interior), dashboard instrumentation, fuses, relays, wiring harnesses, diagnostic connectors (if applicable for the era). Procedures Included Procedures Included: General maintenance tasks, diagnostic procedures for troubleshooting, detailed engine repair and overhaul, transmission service and repair, brake system inspection and repair, electrical system diagnosis and repair, suspension and steering alignment and repair, cooling system maintenance, fuel system and injection system servicing, emission control system adjustments, HVAC system servicing, chassis and body repair, interior trim removal and installation, lubrication procedures, component replacement, and much more. Troubleshooting Methodology: Systematic diagnostic procedures, identifying symptoms and tracing them to potential causes, including electrical tests, pressure tests, and component checks. Engine Rebuild Procedures: Complete engine disassembly, cleaning, inspection, measurement of critical components (cylinder bores, pistons, crankshaft, camshaft), and reassembly with specified tolerances and torque values. Technical Depth Technical Depth: Comprehensive factory-level repair and diagnostic information, suitable for professional technicians and advanced DIY enthusiasts. Includes technical data, diagrams, schematics, specifications, and step-by-step repair instructions. Diagnostic Charts: Inclusion of diagnostic flowcharts and tables to aid in pinpointing mechanical and electrical faults. 📊 Manual Specifications File Format File Format: PDF (requires Adobe PDF Reader) Print Quality Print Quality: High quality, printable pages Binding Type Binding Type: Digital Download (PDF), unzipping may be required for larger files. Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Primary Engine: Mercedes-Benz OM617.95 Turbo Diesel Performance Engine Displacement: 3.0 Liters (2998 cc) Horsepower Approximate: 125 hp @ 4350 rpm (Varies slightly by specific W123 model and year) Torque Approximate: 180 lb-ft @ 2400 rpm (Varies slightly by specific W123 model and year) Fuel System Fuel System Type: Direct Injection, Turbocharged, Bosch Inline Fuel Injection Pump Fuel Type: Diesel Components Turbocharger Details: Garrett or Schwitzer turbocharger (specific model may vary by production date, covered in manual). Glow Plug System: Pre-heating system for cold starts, critical for diesel engine operation. Engine Block Material: Cast Iron Cylinder Head Material: Aluminum Alloy Maintenance Valve Adjustment: Hydraulic lifters with mechanical adjustment procedures specified in the manual. Engine Oil Capacity: Approximately 7.5 liters (8 US quarts) including filter. Refer to manual for precise capacity. 🔧 Transmission Standard Standard Transmission Type: 4-speed Manual Transmission (some W123 models). Optional Optional Transmission Type: 4-speed Automatic Transmission (commonly found in turbo diesel models). Features Automatic Transmission Features: Hydraulic torque converter, Park, Reverse, Neutral, Drive, and selector positions for specific gears (e.g., '2', '3') for winter or engine braking. Fluid Specifications Automatic Transmission Fluid Type: Refer to manual for specific MB fluid specification (e.g., Dexron II equivalent or MB specific fluids depending on year). 📐 Dimensions Exterior Wheelbase Sedan: Approx. 110.2 inches (2799 mm) Overall Length Sedan: Approx. 188.2 inches (4780 mm) Weights Curb Weight Turbo Diesel: Approx. 3200-3400 lbs (1450-1540 kg) depending on body style and equipment. 🛡️ Safety...