🏷️ Basic Information Identification Make: Mercedes-Benz Model: 200D, 240D, 240TD, 300D, 300TD Product Name: Mercedes-Benz 200D 240D 240TD 300D 300TD 1976-1985 Service Repair Manual Generation Covered Years: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Codes Chassis Codes: W115 (partial updates), W123 👋 Introduction Market Position Market Segment: Mid-size luxury/executive sedans and wagons, renowned for durability and diesel efficiency. Competitive Analysis Key Competitors: BMW 5 Series, Audi 100, Volvo 240 Series, Peugeot 504/604 Key Features Vehicle Attributes: Robust diesel engines, build quality, ride comfort, safety features for its era, long-term reliability. Manual Value Target Audience: DIY mechanics, independent repair shops, classic Mercedes-Benz enthusiasts, owners seeking detailed maintenance and repair knowledge. 📋 Manual Details Coverage Areas Primary Coverage: Mechanical and Electrical Systems, Bodywork, Maintenance, Troubleshooting, Repair Page Count Estimated Pages: 500-1000+ (typical for comprehensive factory-level manuals of this era) Manual Type Type: Factory Service Manual / Workshop Manual Language Language: English (likely, common for international service manuals) Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine (Diesel - OM615, OM616, OM617), Fuel System, Cooling System, Exhaust System Drivetrain: Transmission (Manual & Automatic), Clutch, Drive Shaft, Differential, Axles Suspension Steering: Front Suspension, Rear Suspension, Steering System, Wheel Alignment Brakes: Brake System (Disc & Drum), Parking Brake, ABS (if applicable on later models) Electrical: Battery, Charging System, Ignition System, Lighting System, Instrumentation, Wiring Diagrams Body Chassis: Body Structure, Doors, Windows, Interior Trim, Exterior Trim, Chassis Components Procedures Included Maintenance: Oil Change, Filter Replacement, Fluid Checks, Lubrication, Belt Adjustments Repair: Engine Rebuilds, Transmission Overhaul, Suspension Component Replacement, Brake Service, Electrical Component Diagnosis and Repair Troubleshooting: Diagnostic Charts, Symptom-Based Troubleshooting Guides, Fault Code Analysis (where applicable) Specifications: Torque Specifications, Clearances, Gaps, Fluid Capacities, Electrical Specifications Technical Depth Depth: Comprehensive: From basic maintenance to complete engine and transmission rebuilds, including detailed diagnostic procedures. 📊 Manual Specifications File Format Digital Quality: High-resolution scans or original digital files, ensuring readability of text and diagrams. Searchability: Likely text-searchable if created from OCR'd documents or original digital source. Print Quality Printability: Designed for printing specific sections or the entire manual, with clear diagrams and text. Binding Type Digital Binding: N/A (Digital Format) Paper Type Digital Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Codes: OM615 (2.0L), OM616 (2.4L), OM617 (3.0L) Engine Type: Inline-4 (200D, 240D), Inline-5 (300D) Aspiration: Naturally Aspirated Diesel Performance 200D Power Output: Approx. 55-65 hp (depending on specific market/year) 240D Power Output: Approx. 62-72 hp (depending on specific market/year) 300D Power Output: Approx. 70-80 hp (depending on specific market/year) 300Td Power Output: Approx. 77-88 hp (depending on specific market/year, TD often implied turbo or wagon variant) Fuel System Fuel Delivery: Bosch Inline Injection Pump Fuel Type: Diesel Fuel Maintenance Notes Glow Plugs: Critical for cold starting; regular testing and replacement recommended. Valve Adjustment: Requires periodic adjustment to maintain performance and fuel efficiency. 🔧 Transmission Standard Transmission Options: 4-speed Manual, 4-speed Automatic (often denoted '4G-Tronic' or similar) Optional Automatic Transmission: Available on most models, providing smoother operation for touring. Features Clutch Type: Single Dry Plate (Manual Transmission) Fluid Specifications Automatic Transmission Fluid: MB Spec 236.1 (e.g., Dexron II compatible variants) Manual Transmission Fluid: GL-4 Gear Oil (e.g., SAE 80W-90) 📐 Dimensions Exterior Body Styles: Sedan (W123), Wagon (S123 - 240TD, 300TD) Wheelbase: Approx. 2794 mm (110 inches) for W123 Sedan Weights Curb Weight: Approx. 1400-1600 kg (3086-3527 lbs), varies by model and equipment. 🛡️ Safety Features Ratings Era Safety Standards: Designed to high standards for its time, focusing on structural integrity and occupant protection. Active Features Braking System: Front Disc Brakes, Rear Drum Brakes. Some later models might have optional rear discs or ABS. Passive Features Construction: Reinforced passenger safety cell, crumple zones, padded dashboard. Seatbelts: Standard front seatbelts; rear seatbelt provisions. 💡 Technology Features Infotainment Audio System: Factory AM/FM radio, often with cassette player option. Basic sound quality. Driver Assistance Cruise Control: Optional on many models, providing highway comfort. Connectivity Auxiliary Inputs: None (standard equipment for the era). Climate Control HVAC System: Manual heating and ventilation, optional Air Conditioning (often belt-driven compressor). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles (8,000-12,000 km) or 6-12 months. Fuel Filter Replacement: Every 15,000-20,000 miles (24,000-32,000 km). Air Filter Replacement: Every 10,000-15,000 miles (16,000-24,000 km). Fluid Specifications Engine Oil Type: API CD or higher, SAE 10W-40 or 15W-40 diesel rated oil. Coolant Type: Ethylene Glycol based antifreeze, typically a 50/50 mix with distilled water. Brake Fluid Type: DOT 3 or DOT 4. Known Issues Common Problems: Vacuum leaks (door locks, climate control), injector pump wear, early generation OM617 oil cooler leaks, rust (especially around wheel wells and undercarriage), idle speed instability. Diesel Specific Issues: Glow plug system reliability, injection pump calibration, valve seat wear on higher mileage engines. 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Renowned for engineering excellence,...