🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300CD Year: 1985 Codes Chassis Code: W123 Engine Code: OM617.952 👋 Introduction Market Position Segment: Luxury Diesel Sedan/Coupe (W123 Chassis) Target Audience: Owners and independent mechanics seeking in-depth repair and maintenance knowledge Competitive Analysis Competitors: BMW 5 Series Diesel, Audi Diesel models of the era Key Features Vehicle Appeal: Durability, fuel economy, robust diesel engine, build quality Manual Value: Empowers DIY owners to maintain and repair their classic Mercedes-Benz effectively 📋 Manual Details Coverage Areas Coverage Scope: All Service and Repair Page Count Estimated Pages: 700+ Manual Type Type: Factory Service Manual / Repair Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Engine: 3.0L Inline 5-Cylinder Turbo Diesel (OM617.952) Fuel System: Bosch VE Injection Pump, Fuel Lines, Filters, Glow Plug System Cooling System: Radiator, Water Pump, Thermostat, Hoses, Fan Clutch Exhaust System: Manifold, Downpipe, Mufflers, Catalytic Converter (if equipped) Transmission: 4-Speed Automatic (722.3) Drivetrain: Rear Wheel Drive, Driveshaft, Differential, Axles Suspension: Front Independent, Rear Independent (Semi-Trailing Arm), Springs, Dampers, Bushings Steering: Power-Assisted Recirculating Ball System Brakes: Front Disc, Rear Disc, Hydraulic System, Parking Brake Electrical System: 12V System, Battery, Alternator, Starter, Wiring Diagrams, Lighting Climate Control: HVAC System, Heater Core, A/C Components (if equipped) Body: Body Panels, Doors, Windows, Locks, Exterior Trim Interior: Seats, Dashboard, Upholstery, Trim Panels Diagnostic Troubleshooting: Systematic Fault Finding Guides Procedures Included Maintenance: Oil Changes, Filter Replacements, Fluid Checks, Belt Adjustments, Spark Plug Replacement (Diesel equivalent – Glow Plugs) Repair: Engine Overhaul, Transmission Rebuild, Brake System Repair, Suspension Component Replacement, Electrical Component Diagnosis and Replacement Adjustment: Valve Clearances, Injection Pump Timing, Steering Linkage Disassembly Assembly: Component-level breakdown and reassembly instructions Technical Depth Depth: Comprehensive (from basic maintenance to complete engine and transmission rebuilds) Diagnostic Focus: Detailed symptom-based diagnostics and specific troubleshooting charts Torque Specifications: All critical fastener torque values included Wiring Diagrams: Complete and detailed electrical schematics 📊 Manual Specifications File Format Digital Format: PDF (Searchable and Printable) Print Quality Resolution: High-resolution scans for clarity of text and diagrams Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Inline 5-Cylinder, Overhead Camshaft (OHC), Naturally Aspirated Diesel Displacement: 3.0 Liters (2998 cc) Bore X Stroke: 87.0 mm x 92.4 mm Compression Ratio: 21.0:1 Performance Horsepower: 85 hp @ 4200 rpm (approx.) Torque: 135 lb-ft @ 2400 rpm (approx.) Fuel System Injection System: Bosch Inline Fuel Injection Pump (VE type) Fuel Type: Diesel Fuel Glow Plugs System: Pre-combustion chamber glow plug system Engine Oil Capacity: 7.5 Liters (8.0 US Quarts) Recommended Viscosity: SAE 15W-40 (or 10W-30/10W-40 depending on climate) Specification: API CD or ACEA B2 🔧 Transmission Standard Type: 4-Speed Automatic Transmission Model Code: 722.3 Optional Type: 5-Speed Manual Transmission (less common) Features Torque Converter Lockup: Yes (in 3rd and 4th gear on some variants) Fluid Capacity Automatic: Approx. 8 Liters (17 pints) Fluid Specification Automatic: Mercedes-Benz Fluid 236.1 (ATF DEXRON II compatible) 📐 Dimensions Exterior Length: 4725 mm (186.0 in) Width: 1790 mm (70.5 in) Height: 1440 mm (56.7 in) Wheelbase: 2790 mm (109.8 in) Weights Curb Weight: Approx. 1450 kg (3197 lbs) Gross Vehicle Weight: Approx. 1900 kg (4189 lbs) Cargo Trunk Volume: Approx. 16.7 cu ft (473 L) Wheels Tires Wheel Bolt Pattern: 5x112 Standard Tire Size: 175 SR 14 or 185/70 R14 🛡️ Safety Features Ratings NHTSA Rating: Not explicitly rated by NHTSA under modern standards, but known for robust construction. Passive Features Airbags: Driver airbag (optional/standard depending on market and production date) Seatbelts: Front and rear seat belts Construction: Reinforced safety cage, crumple zones Active Features ABS: Anti-lock Braking System (Optional on some models) 💡 Technology Features Infotainment Audio System: Factory AM/FM Radio with Cassette Player (typical) Speakers: Multiple speaker locations Driver Assistance Cruise Control: Standard or Optional 🔧 Maintenance Service Intervals Oil Change: Every 5,000 miles or 6 months Air Filter Replacement: Every 15,000 miles or 12 months Fuel Filter Replacement: Every 10,000 miles or 12 months Glow Plug Check: As needed, per manual troubleshooting Fluid Specifications Coolant: 50/50 mix of Mercedes-Benz approved coolant and distilled water Brake Fluid: DOT 4 Known Issues Common Problems: Vacuum leak issues (door locks, climate control), injector pump seals, injector line leaks, rust (especially around wheel wells and rocker panels), potential valve seat wear on high-mileage engines. Common Problems Continued: Transmission cooling line leaks, suspension bushings wear, front axle kingpins wear. 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Pioneers in automotive engineering, known for diesel technology and luxury vehicles. Model Evolution W123 Generation: Part of the highly regarded W123 series (1976-1985), known for exceptional durability and build quality. Cd Designation: Represents the 'Coupe Diesel' variant, though also available as a sedan. Production Production Years: W123 series: 1976-1985. Specific 300CD production: 1978-1985. Manufacturing Location: Germany (primarily) 🏆 Awards & Recognition Recognitions Vehicle...