🏷️ Basic Information Identification Make: Mercedes-Benz Model: W114 280C Model Generation: First Generation (W114/W115) Body Style: Coupe Codes Chassis Code: W114.073 👋 Introduction Market Position Vehicle Segment: Luxury/Executive Mid-size Coupe Competitive Analysis Competitors: BMW E9 Coupe, Audi 100 Coupe S Key Features Design Philosophy: German engineering, build quality, and understated elegance typical of Mercedes-Benz Manual Value Proposition: Inexpensive way to keep the vehicle working properly by providing comprehensive repair information. 📋 Manual Details Coverage Areas Applicable Model Years: 1972, 1973, 1974, 1975, 1976 Page Count Estimated Page Count: Hundreds of pages Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Service Repair: Comprehensive engine diagnosis, overhaul, and repair. Transmission Service Repair: Coverage for manual and automatic transmission service, repair, and overhaul. Brake System: Detailed procedures for brake system maintenance, repair, and adjustment. Electrical System: In-depth diagnostics and repair for all electrical components and circuits. Wiring Diagrams: Detailed and integrated wiring diagrams for troubleshooting the electrical system. Suspension: Repair and maintenance of suspension components, alignment, and ride height. Steering: Service and repair procedures for the steering system, including power steering. Cooling System: Maintenance and repair of the radiator, cooling fans, thermostat, and coolant passages. Fuel Injection: Specific coverage for the Bosch D-Jetronic fuel injection system. Fuel System: Service and repair of fuel pumps, lines, tanks, and associated components. Emission System: Information pertaining to emission control systems of the era. Heater Air Conditional: Service and repair of the HVAC system, including heating and ventilation. Engine Control System: Diagnostics and troubleshooting for engine management electronics. Chassis Body: Bodywork repair, structural integrity, and chassis components. Restraint System: Information on seat belts and early passive safety features. Interior: Service and repair procedures for interior trim and components. Differential Drive: Maintenance and repair of the rear axle differential and drive components. Axle: Service procedures for front and rear axles, including bearings and seals. General Maintenance: Routine maintenance procedures and schedules. Troubleshooting: Systematic troubleshooting guides for common and complex issues. Periodic Lubrication: Detailed lubrication points and recommended service intervals. Procedures Included Repair Procedures: Step-by-step instructions for complete disassembly and reassembly of major components. Diagnostic Procedures: Methods for identifying and resolving vehicle faults, particularly for electrical systems. Tune Up Procedures: Guidance on engine tuning for optimal performance and emissions. Electrical Troubleshooting: Combined troubleshooting and electrical service procedures with detailed wiring diagrams. Technical Depth Depth: Full factory service repair manual, suitable for DIYers and experienced mechanics. Detail Level: Hundreds of photos and illustrations, detailed substeps, notes, cautions, and warnings. 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Printable without restriction, either in its entirety or select pages. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) Delivery Delivery Method: Instant download link available on the checkout page after payment. Requirements Software Requirements: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder, SOHC Engine Displacement: 2.8 Liters (2778 cc) Engine Code: M130 Performance Horsepower: Approximately 180 hp (SAE Gross) Torque: Approximately 230 Nm (SAE Gross) Fuel System Fuel Delivery: Bosch D-Jetronic Electronic Fuel Injection Fuel Type: Premium Unleaded Gasoline 🔧 Transmission Standard Transmission Type: 4-Speed Manual (Standard on some models) Optional Transmission Type: 4-Speed Automatic (Optional) Features Drive Layout: Rear-Wheel Drive 📐 Dimensions Exterior Wheelbase: 110.2 inches (2800 mm) Length: 189.4 inches (4810 mm) Width: 70.1 inches (1780 mm) Height: 54.7 inches (1390 mm) Weights Curb Weight: Approximately 3,300 - 3,500 lbs (1500 - 1600 kg) 🛡️ Safety Features Ratings Safety Standards: Designed to contemporary automotive safety standards of the early 1970s. Active Features Braking System: Front Disc Brakes, Rear Drum Brakes; often with power assistance. Passive Features Seat Belts: Standard seat belts. Body Construction: Robust unibody construction with crumple zones. 💡 Technology Features Infotainment Audio System: Period-correct factory AM/FM radio, potentially with an aftermarket upgrade. Driver Assistance Features: Limited by era; focus on core driving dynamics and comfort features. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,000-5,000 miles or 6-12 months, depending on driving conditions (refer to manual for exact specifications). Tune Up Interval: Recommended annually or every 10,000-15,000 miles (refer to manual). Fluid Specifications Engine Oil: Refer to manual for viscosity grade (e.g., 10W-40 or 20W-50 depending on climate) and API service classification. Coolant: Ethylene glycol-based antifreeze/coolant mixture. Brake Fluid: DOT 3 or DOT 4 brake fluid. Transmission Fluid Auto: Dexron-II or equivalent automatic transmission fluid (ATF). Known Issues Common Wear Items: Fuel injection system components (fuel accumulators, pressure regulators), ignition system components, exhaust system, suspension bushings, and potential rust in common Mercedes-Benz areas. Electrical Gremlins: Age-related degradation of wiring insulation and connectors can lead to intermittent electrical faults. 📚 Vehicle History Brand Heritage Manufacturer: Mercedes-Benz, known for engineering excellence and luxury vehicles. Model Evolution Introduction Year: 1968 (W114/W115 series) Coupe Variant Introduction: 1969 Facelift: Minor updates...