🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Series Model Variant: 300D, 300CD, 300TD (Turbo) Codes Chassis Code 300D: 123.130 Chassis Code 300D Turbo: 123.133 Chassis Code 300Cd: 123.150 Chassis Code 300Cd Turbo: 123.153 Chassis Code 300Td: 123.190 Chassis Code 300Td Turbo: 123.193 Generation Generation Name: First Generation W123 Production Years Covered: 1977-1985 👋 Introduction Market Position Target Audience: DIY enthusiasts, independent repair shops, W123 owners Value Proposition: Inexpensive way to maintain and repair vehicles, access to dealer-level information Competitive Analysis Uniqueness: Factory-level detail for specific W123 diesel models Key Features Key Selling Point: Comprehensive coverage, detailed illustrations, step-by-step instructions 📋 Manual Details Coverage Areas Covered Models: 300D, 300CD, 300TD (Including Turbo variants) Covered Years: 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Page Count Page Count Estimate: Extensive (Implied by detailed sections, actual count not specified) Manual Type Manual Type: Service Repair Manual (Factory Service Manual Equivalent) Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine removal/installation, crankcase, cylinder head, engine breathing, crank assembly, timing, valves, lubrication, cooling system, mounting Fuel System: Diesel injection system, carburetor system (for gasoline variants not specified but listed in sections), mechanically/electronically controlled gasoline injection systems (for gasoline variants not specified but listed in sections), fuel system components Forced Induction: Exhaust gas turbocharger (for Turbo models) Electrical Engine: Ignition system, preheating system, starter, alternator Transmission Drivetrain: Clutch, manual transmission, automatic transmission, transfer case (if applicable), pedals, throttle control, throttle linkage, longitudinal regulating shaft, front wall regulating shaft, accelerator pedal Suspension Steering: Frame, suspension, front axle, rear axle, trailing axle, wheels, chassis measurements, steering Brakes: Hydraulic and mechanical brake system, pneumatic system and auxiliary brakes (likely for heavier duty variants or specific configurations) Body Chassis: Body general, understructure, front end, front wall, side wall, rear wall, rear end, roof, glass, windows, interior equipment, doors, trunk lid, fuel flap, slide roof/sun roof, top, racks, body sealing, anti-corrosion protection, paintwork Electrical Body: General electrical system, equipment and instruments, speed control systems, radio, windshield washer system, light range regulator Climate Control: Climate control systems Auxiliary Systems: Air compressor, belt drives, auxiliary drives, hydraulic and articulated systems, emergency equipment, sanitary equipment, kitchen, attachments, outside flaps Interior Trim: Seats, cots, restraint systems, body noises, sound insulation Procedures Included Maintenance: Scheduled maintenance, fluid level checks, lubrication, filter changes Diagnostics: All diagnostic procedures covered Repair: Step-by-step repair instructions for all covered systems Rebuilding: Rebuilding procedures for major components Refurbishment: Refurbishment guidance Restoration: Restoration guidance for classic W123 models Troubleshooting: Troubleshooting common issues Technical Data: General technical data, service product specifications (fluids, etc.) Operation Usage: Operating instructions Vehicle Handling: Jacking-up, towing-off, laying-up vehicle Emissions Control: Emission control systems Technical Depth Depth Of Information: Comprehensive (Dealer-level detail) Illustrations: Detailed illustrations included Instruction Style: Step-by-step instructions 📊 Manual Specifications File Format File Format: PDF Searchability: Assumed searchable text content within PDF Print Quality Printability: Printable without restriction Binding Type Binding Type: Digital Download (Printable pages) Paper Type Paper Type: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Code 300D 300Cd 300Td: OM617.912 Engine Type 300D 300Cd 300Td: Inline 5-cylinder Diesel Engine Code 300D Turbo 300Cd Turbo 300Td Turbo: OM617.952 Engine Type 300D Turbo 300Cd Turbo 300Td Turbo: Inline 5-cylinder Diesel with Turbocharger Performance Displacement Om617: 3.0 Liters (2998 cc) Horsepower Om617 Non Turbo: Approx. 77-80 hp (depending on year/market) Torque Om617 Non Turbo: Approx. 130-135 lb-ft (depending on year/market) Horsepower Om617 Turbo: Approx. 87-93 hp (depending on year/market) Torque Om617 Turbo: Approx. 135-145 lb-ft (depending on year/market) Fuel System Injection Type Om617: Direct Injection, Bosch inline injection pump Fuel Type: Diesel Fuel 🔧 Transmission Standard Standard Transmission Type: 4-speed Manual (often optional) Optional Optional Transmission Type: 4-speed Automatic (common) Features Transmission Notes: Manual and automatic transmissions were available across the W123 range. Specific availability varied by model and year. 📐 Dimensions Exterior Body Styles: Sedan (4-door), Coupe (2-door), Wagon (TD - Touring Diesel) Weights Curb Weight Estimate: Approx. 3,200 - 3,800 lbs (depending on body style and equipment) 🛡️ Safety Features Ratings Safety Era Consideration: Designed to meet 1970s/early 1980s safety standards; lacks modern advanced safety features. 💡 Technology Features Infotainment Infotainment Features: Basic analog radio, optional cassette player. No modern infotainment systems. Driver Assistance Driver Assistance Features: Limited to cruise control (speed control systems). No electronic stability or traction control. Connectivity Connectivity Features: None. 🔧 Maintenance Service Intervals Oil Change Interval Diesel: Typically every 3,000-5,000 miles or 6-12 months (consult manual for exact specifications) Fuel Filter Interval Diesel: Recommended replacement every 15,000-30,000 miles (consult manual) Fluid Specifications Engine Oil Spec Diesel: API CD or higher (e.g., 15W-40, 20W-50 depending on climate - consult manual) Coolant Type: Ethylene Glycol based coolant (e.g., Mercedes-Benz approved) Transmission Fluid Auto: Dexron II or equivalent (verify with manual) Known Issues Common W123 Issues: Vacuum leaks (door locks, climate control), glow plug...