🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300 CD Chassis Code: W123 Coupe (C123) Model Years Covered: 1976-1985 👋 Introduction Market Position Target Audience: Mercedes-Benz 300 CD owners, independent repair shops, and automotive enthusiasts seeking detailed technical information. Value Proposition: Provides critical, often unavailable, factory-specific knowledge for maintenance, repair, and restoration of the W123 300 CD. Competitive Analysis Alternatives: Third-party repair manuals (Haynes, Chilton) often lack the depth and accuracy of factory documentation. Key Features Authenticity: Directly sourced from Mercedes-Benz factory documentation. Diagnostic Capability: Enables in-depth troubleshooting and accurate repair of complex systems. 📋 Manual Details Coverage Areas Manual Type: Factory Service Workshop Manual Language: English Format: Digital Download (implied by 'FREE DOWNLOAD!!!', typically PDF) Coverage Scope: Comprehensive factory-level repair and maintenance information 📖 Manual Coverage Systems Covered Engine: OM617.952 Diesel Engine (3.0L Inline 5-Cylinder Turbocharged) Fuel System: Bosch VE Injection Pump, Glow Plug System, Fuel Lines, Filters Cooling System: Radiator, Water Pump, Thermostat, Hoses, Fan Clutch Exhaust System: Manifold, Downpipe, Muffler, Catalytic Converter (where applicable), Emission Controls Transmission: 4-Speed Automatic (722.118) Drivetrain: Rear Wheel Drive, Driveshaft, Differential, Axles Suspension: Front Independent (Double Wishbone), Rear Independent (Semi-Trailing Arm), Springs, Shock Absorbers, Anti-Roll Bars Steering: Recirculating Ball Steering Gear, Power Steering System, Steering Column Brakes: Front Discs, Rear Discs, Hydraulic System, Parking Brake Electrical System: Battery, Charging System (Alternator), Starting System (Starter), Ignition System (Glow Plugs), Lighting, Fuses, Relays, Wiring Diagrams Body And Chassis: Body Construction, Doors, Hood, Trunk, Windows, Seals, Interior Trim, Sound Deadening Climate Control: HVAC System, Heater Core, Blower Motor, Air Conditioning (where equipped) Procedures Included Maintenance: Oil Changes, Filter Replacements, Fluid Checks and Top-Offs, Belt Adjustments, Air Cleaner Service Troubleshooting: Diagnostic Charts, Symptom-Based Problem Solving, Fault Code Identification (where applicable) Repair: Engine Overhaul, Transmission Rebuild, Brake System Repairs, Suspension Component Replacement, Electrical Component Diagnosis and Replacement Adjustment: Valve Lash Adjustment, Injection Pump Timing, Parking Brake Adjustment Inspection: Pre-delivery Inspection (PDI), Regular Inspection Checklists Installation: Component Installation and Removal Procedures Technical Depth Depth: Factory-level detail including torque specifications, clearance measurements, component removal/installation sequences, and diagnostic procedures. 📊 Manual Specifications File Format Digital Format: PDF (standard for digital service manuals) Searchability: Likely text-searchable PDF for efficient information retrieval Print Quality: High (consistent with factory documentation, allowing for clear diagrams and text) Binding Type: N/A (Digital Download) Paper Type: N/A (Digital Download) Completeness: Comprehensive workshop manual, equivalent to what Mercedes-Benz dealership technicians would use. ⚙️ Engine Specifications Primary Engine Engine Code: OM617.952 Engine Type: Turbocharged Diesel, Inline 5-Cylinder Displacement: 3.0 Liters (2998 cc) Bore X Stroke: 90.9 mm x 107.0 mm Compression Ratio: 21.5:1 Performance Horsepower Net: 83 hp @ 4000 rpm (approx.) Torque Net: 131 lb-ft @ 2400 rpm (approx.) Fuel System Injection System: Bosch Inline Fuel Injection Pump (VE type), Mechanical Injection Fuel Type: Diesel Fuel (ASTM D975 Grade 1-D or 2-D) Glow Plug System: Direct electric pre-heating of combustion chambers for cold starts. Fluid Capacities Engine Oil Capacity: 7.5 Liters (8 US Quarts) with filter change Fluid Specifications Engine Oil Specification: API CD or higher, SAE 15W-40 or 10W-30 (depending on climate) 🔧 Transmission Standard Transmission Type: 4-Speed Automatic Transmission Code: 722.118 Features Hydraulic Control: Hydromechanical control for smooth shifting. Fluid Capacities Transmission Fluid Capacity: Approx. 7.5 Liters (16.5 US Pints) for a complete fill (torque converter included) Fluid Specifications Transmission Fluid Specification: MB 236.2 or Dexron II (check manual for exact MB specification) 📐 Dimensions Exterior Body Style: 2-Door Coupe Wheelbase: 2794 mm (110 inches) Length: 4725 mm (186 inches) Width: 1770 mm (69.7 inches) Height: 1410 mm (55.5 inches) Weights Curb Weight: Approx. 1560 kg (3440 lbs) Gross Vehicle Weight Rating: Approx. 2050 kg (4519 lbs) 🛡️ Safety Features Passive Features Seat Belts: Front 3-point automatic seat belts, rear lap belts. Body Construction: Reinforced safety cage, crumple zones, energy-absorbing steering column. Headrests: Front and rear headrests (design varies by year). Active Features Braking System: Four-wheel disc brakes with power assistance. Steering: Power-assisted recirculating ball steering for improved control. Ratings Crash Test Data: As a vintage vehicle, formal crash test data from modern agencies (NHTSA, IIHS) may not be directly comparable or available for all model years. The W123 chassis was engineered with significant safety advancements for its era. 💡 Technology Features Infotainment Audio System: Factory-installed AM/FM radio and cassette player (options varied). Antenna System: Power-operated antenna (typical). Driver Assistance Cruise Control: Optional cruise control system available on some models. Connectivity Wireless Technology: N/A (This era predates widespread wireless connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles (8,000-12,000 km) or 6-12 months, depending on driving conditions and oil used. Consult manual for precise intervals. Air Filter Replacement: Every 15,000-20,000 miles (24,000-32,000 km) or as needed based on dust conditions. Fuel Filter Replacement: Every 15,000-25,000 miles (24,000-40,000 km). Crucial for diesel engine health. Transmission Fluid Change: Typically every 25,000-30,000 miles (40,000-48,000 km)....