🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Product Name: Mercedes Benz W123 1981-1993 Service Repair Workshop Manual Codes Chassis Code: W123 Generation Production Start Year: 1975 Production End Year: 1985 👋 Introduction Market Position Era Of Influence: The W123 series represented Mercedes-Benz's commitment to robust engineering, durability, and luxury in the executive sedan market of the late 1970s and early 1980s. Competitive Analysis Competitors: Competed against vehicles like the BMW 5 Series (E12, E28), Audi 100/200, Volvo 240/740, and Jaguar XJ in its segment. Key Features Durability Reputation: Known for exceptional build quality and longevity, often referred to as one of the most over-engineered Mercedes-Benz models. Design Philosophy: Emphasized safety, comfort, and mechanical robustness over fleeting style trends. Manual Value Proposition: Provides essential, factory-accurate information for maintaining and repairing a classic Mercedes-Benz, crucial for preserving its value and functionality. 📋 Manual Details Coverage Areas Applicable Model Years: 1981, 1982, 1983, 1984, 1985 Page Count Estimated Page Count: Varies significantly based on specific sub-model and engine. Typically 1000+ pages for a comprehensive factory manual. Manual Type Type: Factory Service Repair Workshop Manual Language Language: Likely English (assuming standard distribution for sale), though original manuals were often in German and other languages. PDF manuals may be translated. Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Systems: Fuel injection (Bosch K-Jetronic, mechanical injection for diesel), ignition systems, cooling systems, lubrication systems, engine mechanical (cylinder head, block, crankshaft, pistons, timing components), emissions control. Transmission Systems: Manual and automatic transmissions (e.g., 4-speed manual, 5-speed manual, 3-speed automatic, 4-speed automatic), clutch, driveshafts, differentials. Chassis Systems: Suspension (front independent, rear independent), steering (power steering), brakes (hydraulic, disc/drum configurations, ABS for later models), wheel alignment. Electrical Systems: Wiring diagrams, lighting, instrumentation, starting system, charging system (alternator), battery, fuse box, relays, power windows, central locking, HVAC controls. Body And Interior: Body panel removal and installation, door mechanisms, window regulators, seat adjustment, dashboard removal, sound insulation, convertible top mechanisms (if applicable). Procedures Included Maintenance Procedures: Oil changes, filter replacements (oil, fuel, air), coolant flushes, spark plug replacement, brake fluid changes, belt inspections and replacement, chassis lubrication. Repair Procedures: Engine overhaul, cylinder head gasket replacement, piston ring replacement, transmission rebuilds, brake caliper overhaul, steering box repair, suspension component replacement, starter/alternator replacement. Troubleshooting: Diagnostic charts for engine performance issues, electrical faults, braking problems, and drivability concerns. Symptom-based diagnostics. Diagnostics: Ignition timing adjustment, fuel pressure testing, compression testing, vacuum leak detection, electrical continuity and resistance checks. Technical Depth Depth: Comprehensive, factory-level detail suitable for professional technicians and experienced DIYers. Covers everything from basic maintenance to complete engine and transmission rebuilds, electrical system diagnostics, and bodywork. 📊 Manual Specifications File Format Format: PDF (Portable Document Format) Print Quality Quality: Typically high-resolution scans of original factory documents, ensuring clarity of text, diagrams, and photographs. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) Features Searchability: Searchable text within the PDF for quick information retrieval. Printability: Printable pages for workshop use. Licensing Licensing: No expiry dates, unlimited access. ⚙️ Engine Specifications Primary Engine Engine Families: M102 (petrol inline-4), M110 (petrol inline-6), OM615 (diesel inline-4), OM616 (diesel inline-4), OM617 (diesel inline-5, including turbo variants). Performance Typical Horsepower Range: Petrol: 72 hp (2.0L diesel) to 180 hp (2.8L inline-6). Diesel: 55 hp (2.0L diesel) to 125 hp (3.0L turbo-diesel). Typical Torque Range: Petrol: 140 Nm to 240 Nm. Diesel: 110 Nm to 250 Nm (turbo-diesel). Fuel System Petrol Injection: Bosch K-Jetronic mechanical fuel injection on most petrol engines. Diesel Injection: Bosch inline injection pumps (for naturally aspirated and turbocharged diesels). Engine Code Examples M102: 2.0L and 2.3L inline-4 petrol (e.g., 230E, 230CE). Om617: 3.0L inline-5 diesel and turbo-diesel (e.g., 300D, 300TD). 🔧 Transmission Standard Common Transmissions: 4-speed manual, 4-speed automatic. Optional Less Common Transmissions: 5-speed manual (later models), 3-speed automatic (early models). Features Automatic Transmission Control: Hydromechanical control for smooth shifts. Fluid Specifications Automatic Transmission Fluid: Mercedes-Benz Specification 236.1 (e.g., Dexron III equivalent). 📐 Dimensions Exterior Body Styles: Sedan (W123), Coupe (C123), Estate/Station Wagon (S123), Long-wheelbase Sedan (V123). Wheelbase Sedan Approx: 2794 mm (110 inches) Length Sedan Approx: 4725 mm (186 inches) Width Sedan Approx: 1786 mm (70.3 inches) Height Sedan Approx: 1425 mm (56.1 inches) Weights Curb Weight Range: Approximately 1350 kg to 1650 kg depending on body style and engine. Gross Vehicle Weight Rating Approx: 1900 kg to 2100 kg. 🛡️ Safety Features Ratings Historical Safety Standards: Designed to exceed safety standards of its era, with crumple zones, reinforced passenger cell, and safety steering column. Active Features Braking System: Hydraulic dual-circuit braking system with front disc brakes and rear drum brakes. Optional ABS (Anti-lock Braking System) available on later models. Steering System: Recirculating ball steering, with power assist optional and widely adopted. Passive Features Occupant Protection: Safety-padded dashboard, laminated windshield, side-impact protection in doors (later models). Seatbelts: Three-point inertia-reel seatbelts...