🏷️ Basic Information Identification Make: Mercedes-Benz Model: 300D Year: 1990 Generation Chassis Code: W124 Codes Engine Code: OM603.912 👋 Introduction Market Position Positioning: Essential DIY and professional workshop tool for owners and technicians of the 1990 Mercedes-Benz 300D Competitive Analysis Value Proposition: Provides official, factory-level technical data missing from generic online forums and basic repair guides Key Features Official Licensing: Officially licensed, ensuring accuracy and completeness of information Digital Accessibility: Instant online availability, searchable text, easily navigable digital format 📋 Manual Details Coverage Areas Systems Covered: Engine, Fuel System, Electrical System, Drivetrain, Suspension, Brakes, Steering, HVAC, Bodywork, Diagnostic Procedures, Maintenance Schedules Page Count Page Count: Extensive (Digital format implies comprehensive coverage, often exceeding 1000 pages in print equivalent) Manual Type Manual Type: Service and Repair Manual Software Language Language: English Format Format: Software (Digital - likely PDF or proprietary application) 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed diagnostics, repair procedures, component overhaul for OM603.912 diesel engine Fuel System: Bosch inline injection pump servicing, glow plug system, fuel lines, filters Electrical System: Wiring diagrams, component testing, troubleshooting starter, alternator, lighting, and accessories Drivetrain: Automatic transmission (722.4) overhaul, service, and diagnostics; rear axle and driveshaft maintenance Suspension And Steering: Front and rear suspension component replacement, alignment procedures, power steering system repair Brakes: Disc brake system maintenance, ABS diagnostics and repair, brake fluid flush procedures HVAC: Air conditioning system service, heater core replacement, climate control unit troubleshooting Body And Interior: Door panel removal, glass replacement, seat adjustment, trim repair Procedures Included Maintenance: Oil change intervals, filter replacements, fluid checks and changes, belt inspection and replacement Troubleshooting: Step-by-step diagnostic flowcharts for common and uncommon issues, fault code interpretation Repair: Detailed, illustrated instructions for component removal, repair, and reinstallation Diagnostics: Wiring diagrams, component resistance values, pressure testing, vacuum testing procedures Technical Depth Depth: Comprehensive, covering routine maintenance to major overhauls and advanced diagnostics 📊 Manual Specifications File Format Digital Format: Likely PDF or proprietary executable with searchable text and embedded images/diagrams Print Quality Print Quality: N/A (Digital format, but content quality mirrors official factory manuals) Binding Type Binding Type: N/A (Digital format) Paper Type Paper Type: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder Diesel Displacement: 2.996 cc (3.0 Liters) Bore X Stroke: 87.0 mm x 84.0 mm Compression Ratio: 22.0:1 Performance Horsepower: 107 hp @ 4600 rpm (approx.) Torque: 195 lb-ft @ 2400 rpm (approx.) Fuel System Injection Type: Bosch M-Type Inline Fuel Injection Pump Fuel Type: Diesel Fuel Engine Oil Oil Type Recommendation: API CD or higher, SAE 15W-40 or 10W-30 (depending on climate) Oil Capacity: 7.5 Liters (with filter change) 🔧 Transmission Standard Transmission Type: 4-Speed Automatic (722.4) Optional Optional Transmission: 5-Speed Manual (less common on 300D) Features Automatic Features: Lock-up torque converter, hydraulic control unit Fluid Specs Automatic Transmission Fluid: MB 236.1 or 236.2 Specification ATF (e.g., Dexron II compatible) Fluid Capacity Automatic Transmission Fluid Capacity: Approx. 7.5 Liters (total capacity, varies with torque converter) 📐 Dimensions Exterior Length: 4740 mm (186.6 in) Width: 1740 mm (68.5 in) Height: 1420 mm (55.9 in) Wheelbase: 2800 mm (110.2 in) Weights Curb Weight: Approx. 1650 kg (3638 lbs) Gross Vehicle Weight Rating: Approx. 2250 kg (4960 lbs) 🛡️ Safety Features Ratings Safety Standards: Built to meet stringent Mercedes-Benz safety standards of the era; specific crash test data may vary by region. Active Features ABS: Anti-lock Braking System (ABS) standard Traction Control: Optional ASR (Anti-Slip Regulation) available on some models Passive Features Airbags: Driver's side airbag standard Seatbelts: Front and rear seatbelts with pretensioners 💡 Technology Features Infotainment Radio System: Factory AM/FM cassette radio with optional CD changer compatibility Climate Control: Manual or optional automatic climate control (Thermotronic) Driver Assistance Cruise Control: Standard cruise control system Connectivity Phone Integration: No integrated smartphone connectivity (features of the era were basic) 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles or 12 months, whichever comes first, using appropriate diesel oil. Fuel Filter Replacement: Recommended every 20,000-30,000 miles Air Filter Replacement: Recommended every 15,000-20,000 miles Transmission Service: Fluid and filter change recommended every 30,000-50,000 miles Fluid Specifications Coolant Type: Mercedes-Benz Specification 325.0 (Ethylene Glycol based, typically 50/50 mix with distilled water) Brake Fluid Type: DOT 4 Known Issues Common Wear Items: Glow plugs, vacuum lines, fuel injection pump seals, front suspension bushings, engine mounts, exhaust system corrosion. Diesel Specific Issues: Air in fuel system after filter changes, cold weather starting issues if glow plug system is faulty. 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Mercedes-Benz has a long-standing reputation for engineering excellence, durability, and pioneering automotive technology since its inception. Model Evolution W124 Era: The 1990 300D is part of the highly regarded W124 E-Class generation, known for its robust construction and engineering precision. 300D Significance: The 300D represented Mercedes-Benz's commitment to reliable, fuel-efficient, yet luxurious diesel sedans in...