🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Model Line Code: W123 Series Chassis Type: Unibody Generation Generation Name: First Generation W123 Production Years: 1976-1985 👋 Introduction Market Position Target Audience: Independent auto service professionals and owners with basic to advanced mechanical skills Competitive Analysis Manual Type Advantage: Provides dealer-level information, superior to generic manuals Key Features Accuracy: Vehicle-specific information, not generic Completeness: All major topics covered, step-by-step instructions, diagrams, wiring schematics Value Proposition Cost Savings: Enables DIY repairs, saving significant money on labor 📋 Manual Details Coverage Areas Primary Coverage: All mechanical and electrical systems for Mercedes-Benz W123 models 1976-1985 Page Count Estimated Page Count: Likely extensive, common for comprehensive workshop manuals covering this many years (estimate 1500+ pages) Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed repair, overhaul, and troubleshooting of all engine variants Engine Electrical: Ignition, starting, charging systems, sensors, and control units Emission Control: Components and operation of emission control systems for applicable models Fuel System: Carburetor and injection systems, fuel pumps, lines, and filters Clutch System: Clutch assembly, hydraulic system, and linkages Transmission Manual: Manual gearbox repair, overhaul, and adjustment Transmission Automatic: Automatic transmission repair, overhaul, and fluid service Driveshaft Axle: Driveshafts, universal joints, CV joints, and axles Suspension: Front and rear suspension components, shock absorbers, springs, bushings Steering: Steering gear, power steering system, linkages, and column Restraint System: Seat belts and related components Brake System: Hydraulic system, calipers, discs, pads, parking brake Body Interior Exterior: Body panels, doors, glass, trim, interior components Body Electrical: Lighting, wipers, power windows, central locking, instrumentation HVAC: Heating, ventilation, and air conditioning systems Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, tune-ups Troubleshooting: Diagnostic procedures for common and uncommon faults Repair: Step-by-step repair instructions for all major components Overhaul: Complete engine and transmission rebuild procedures Diagnostics: Diagnostic flowcharts and component testing methods Wiring Schematics: Comprehensive electrical wiring diagrams for all systems Technical Depth Depth: Professional-level, suitable for mechanics and advanced DIYers Diagrams Illustrations: Includes diagrams, illustrations, and exploded views 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Fully printable, allowing users to print specific pages Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) Requirements Software Requirements: Adobe PDF Reader or compatible Operating System Compatibility: All versions of Windows and Mac ⚙️ Engine Specifications Primary Engine Common Engine Types: Inline-4 petrol (M115), Inline-6 petrol (M110), Inline-4 diesel (OM615), Inline-5 diesel (OM617), Inline-6 diesel (OM618 - rare) Performance Typical Horsepower Range: 60 HP (diesel) to 180 HP (petrol, depending on variant) Typical Torque Range: 95 lb-ft (diesel) to 200 lb-ft (petrol, depending on variant) Fuel System Fuel Delivery Types: Carbureted (Zenith, Solex), Bosch K-Jetronic Fuel Injection, Diesel Indirect Injection 🔧 Transmission Standard Manual Transmission Options: 4-speed and 5-speed manual transmissions Optional Automatic Transmission Options: 3-speed and 4-speed automatic transmissions (e.g., 4G-TRONIC) Features Rear Wheel Drive: All W123 models feature rear-wheel drive 📐 Dimensions Exterior Body Styles: Sedan (Saloon), Coupe, Estate (Station Wagon/T-Modell), Long-wheelbase Sedan Weights Curb Weight Range: Approximately 1,300 kg to 1,700 kg depending on body style and engine 🛡️ Safety Features Ratings Historical Safety Context: Designed with advanced safety features for its era, including crumple zones and robust body structure. Active Features Available Active Safety: Four-wheel disc brakes (later models), power steering, ABS (optional on later models) Passive Features Available Passive Safety: Reinforced safety cell, energy-absorbing steering column, padded dashboard, seat belts 💡 Technology Features Infotainment Infotainment Systems: Basic analog radio systems, optional cassette players. No modern digital or touch-screen interfaces. Driver Assistance Driver Assistance Features: Limited; ABS available on later models. Focus is on mechanical reliability and driver control. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000-15,000 km (6,000-9,000 miles) or annually, depending on driving conditions and oil type. Major Service Intervals: Intervals for spark plugs, fuel filters, air filters, and transmission fluid changes vary by engine and component. The manual would specify these precisely. Fluid Specifications Engine Oil Type: Various grades depending on engine and climate (e.g., SAE 10W-40, 15W-40 for diesel; SAE 10W-30, 10W-40 for petrol). Manual specifies MB approval codes. Coolant Type: Ethylene glycol-based antifreeze with corrosion inhibitors. Manual specifies MB approved coolant. Brake Fluid Type: DOT 3 or DOT 4 brake fluid. Manual specifies MB approval. Transmission Fluid Type Automatic: Dexron II or equivalent. Manual specifies MB approval. Known Issues Common Wear Items: Brake wear, suspension bushings, fuel injection pump seals (diesel), vacuum lines, exhaust components. Potential Corrosion Areas: Wheel arches, rocker panels, jack points, often addressed with proper undercoating and maintenance. 📚 Vehicle History Brand Heritage Mercedes Benz Legacy: Continuation of Mercedes-Benz's reputation for engineering excellence, durability, and luxury. Model Evolution W123 Significance: The W123 is considered one of the most reliable and durable Mercedes-Benz models ever produced. It...