🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Model Series: W123 Production Years Covered By Manual: 1976-1985 Codes Chassis Code: W123 👋 Introduction Market Position Positioning: The Mercedes-Benz W123 is renowned for its robust engineering, build quality, and durability, making it a highly sought-after classic vehicle. This manual caters to owners and technicians aiming to maintain or restore these iconic automobiles. Competitive Analysis Competitors: Competed against other premium sedans and coupes of its era, such as BMW 5 Series, Audi 100, and Volvo 240/740 series, but distinguished itself with superior build quality and luxury appointments. Key Features Vehicle Appeal: Known for exceptional reliability, comfortable ride, and understated luxury, making it a popular choice for daily driving and long-distance travel. Offers a classic driving experience with robust mechanicals. Manual Value Proposition Value: Provides comprehensive, manufacturer-level repair and maintenance information, empowering owners to perform tasks themselves, thereby saving on dealership labor costs and ensuring proper upkeep of a classic vehicle. 📋 Manual Details Coverage Areas Primary Coverage: Full Workshop Service and Repair Secondary Coverage: Maintenance, Troubleshooting, Diagnostics, Overhaul Procedures, Wiring Diagrams Page Count Estimated Page Count: Hundreds (typical for comprehensive workshop manuals) Manual Type Type: Workshop Service Manual, Repair Manual, Factory Service Manual Language Language: English Format Delivery Method: Instant Download File Format: PDF 📖 Manual Coverage Systems Covered Engine: Engine mechanicals, fuel system, ignition system, lubrication, cooling system, emission controls Transmission: Manual and automatic transmission overhaul, operation, and repair Drivetrain: Driveshafts, differentials, axles Suspension: Front and rear suspension, steering components, shock absorbers, springs Brakes: Brake system components (discs, calipers, drums, master cylinder), hydraulic system, parking brake Electrical: Battery, charging system, starting system, lighting, ignition, instrumentation, wiring diagrams Bodywork: Body panel removal and installation, interior trim, glass, doors, locks, hinges HVAC: Heating, ventilation, and air conditioning (if equipped) Chassis: Frame, subframes, body mounts Procedures Included Maintenance: Periodic maintenance charts, fluid changes, filter replacements, lubrication Troubleshooting: Diagnostic procedures for common and uncommon faults, symptom-based troubleshooting guides Repair: Step-by-step repair instructions for all major components and systems Overhaul: Complete engine and transmission rebuild procedures Diagnostics: Diagnostic fault codes, electrical system testing, mechanical component checks Wiring Diagrams: Comprehensive electrical schematics for all vehicle systems Technical Specifications: Torque specifications, clearances, alignment data, fluid capacities, engine specifications Technical Depth Depth: Suitable for professional technicians and advanced DIY mechanics, covering detailed diagnostics and complete rebuilds. 📊 Manual Specifications File Format Printable: Full Printable Zoom Functionality: Zoom IN/OUT capability Print Quality Quality: High-resolution scans ensuring clarity of diagrams and text Binding Type Type: N/A (Digital PDF) Paper Type Type: N/A (Digital PDF) Software Requirements PDF Reader: Adobe PDF Reader Archive Utility: WinRAR (or similar for decompression) Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Options Covered: Likely covers a range of M115, M110, OM615, OM616, and OM617 diesel and gasoline engines as offered in the W123 series. Performance Typical Power Output Gasoline: Ranges from approximately 75 hp (2.0L) to 180 hp (2.8L inline-6) Typical Power Output Diesel: Ranges from approximately 55 hp (2.0L diesel) to 80 hp (3.0L turbo-diesel) Fuel System Gasoline Engines: Carbureted (e.g., Solex, Zenith) or Bosch K-Jetronic mechanical fuel injection Diesel Engines: Bosch inline injection pumps and glow plug systems Technical Details Engine Orientation: Inline (4-cylinder, 5-cylinder diesel, 6-cylinder) Cylinder Block Material: Cast Iron Cylinder Head Material: Aluminum Alloy 🔧 Transmission Standard Standard Transmission: 4-speed or 5-speed manual transmission Optional Optional Transmission: 3-speed or 4-speed automatic transmission (e.g., 3HP22, 4HP22) Features Transmission Control: Mechanical linkage for manual, hydraulic control for automatic Fluid Specifications Automatic Transmission Fluid: MB 236.2 or equivalent (e.g., Dexron II) Manual Transmission Fluid: GL-4 or GL-5 rated gear oil 📐 Dimensions Exterior Body Styles: Sedan, Coupe, Estate (T-Model), Long Wheelbase Sedan Wheelbase Sedan: Approximately 2795 mm (110.0 in) Wheelbase Coupe: Approximately 2795 mm (110.0 in) Wheelbase Estate: Approximately 2820 mm (111.0 in) Weights Curb Weight Range: Approximately 1300 kg to 1600 kg depending on body style and engine 🛡️ Safety Features Ratings Historical Safety Focus: Known for strong passenger cell, safety-designed crumple zones, and robust construction, ahead of its time in safety features. Active Features Active Safety: Power-assisted steering, 4-wheel disc brakes (on most models), independent suspension Passive Features Passive Safety: Reinforced A, B, and C pillars, safety glass, padded interior surfaces, seat belts 💡 Technology Features Infotainment Infotainment System: Basic AM/FM radio, optional cassette player. Focus on analogue systems. Driver Assistance Driver Assistance: Power steering, optional cruise control (mechanical). Connectivity Connectivity: None (pre-digital era). 🔧 Maintenance Service Intervals Oil Change Interval: Typically 10,000-15,000 km or 6-12 months, depending on engine type and driving conditions Filter Replacement: Oil filter with every oil change, air filter and fuel filter at specified intervals (e.g., 20,000-40,000 km) Spark Plug Replacement: At intervals indicated by the manual, often every 30,000-50,000 km for gasoline engines Fluid Specifications Engine Oil Specification: API...