🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 280 Production Years Covered: 1976-1985 Codes Chassis Code: W123 Engine Code Example: M110 (likely inline-6) 👋 Introduction Market Position Target Audience: Owners of Mercedes-Benz W123 280 models seeking to perform maintenance, repairs, and diagnostics themselves. Competitive Analysis Advantage: Digital format offers convenience, searchability, and cost savings compared to older physical manuals. Key Features Completeness: Official full factory service repair manual, covering all styles and procedures. Usability: Step-by-step instructions, detailed illustrations, and comprehensive coverage make it user-friendly. Cost Effectiveness: Inexpensive way to maintain and repair the vehicle, saving on mechanic labor costs. 📋 Manual Details Coverage Areas Primary Coverage: Mercedes-Benz W123 280 Series Secondary Coverage: All body styles of the W123 280 within the specified years (Sedan, Coupe, Wagon, potentially Limousine) Page Count Estimated Pages: Hundreds (as stated in product description) Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Comprehensive Engine Service/Repair, including disassembly, assembly, and component diagnostics. Transmission: Detailed service and repair procedures for the transmission (likely automatic and/or manual). Brakes: Complete coverage of the brake system, including hydraulic components, friction materials, and troubleshooting. Electrical System: Extensive coverage including wiring diagrams, component testing, and repair for the electrical system. Suspension: In-depth information on suspension components, alignment, and repair procedures. Steering: Detailed service and repair instructions for the steering system, including power steering. Cooling System: Coverage of radiator, coolant, fan, and associated components. Fuel System: Service and repair for the fuel injection system and general fuel system components. Chassis Body: Information on chassis and body repairs, including panel replacement and structural components. Interior: Details regarding interior trim, seating, and associated components. Restraint System: Information pertaining to seat belts and other passive safety features. Climate Control: Service and repair for the Heater and Air Conditioning (HVAC) system. Drive Axle: Coverage of differential and axle components for rear-wheel drive. Procedures Included Maintenance: Scheduled maintenance, periodic lubrication, fluid changes, filter replacements. Troubleshooting: Diagnostic procedures for identifying and resolving common issues. Repair: Step-by-step repair instructions for all major vehicle systems, based on complete disassembly. Diagnostics: Detailed diagnostic trees and fault finding information. Wiring Diagrams: Inclusion of comprehensive wiring diagrams for electrical system troubleshooting and repair. Technical Depth Depth: Complete Factory Service Manual level, suitable for DIY enthusiasts and professional mechanics. Illustrations: Hundreds of photos and illustrations to guide repair procedures. 📊 Manual Specifications File Format Compatibility: Compatible with all Windows and Mac operating systems. Access Method: Accessible via desktop PC, laptop, smartphone, tablet, or web browser. Print Quality Printability: Printable pages, allowing users to print specific sections or the entire manual. Binding Type Binding: Digital (PDF) - no physical binding Paper Type Paper Type: N/A (Digital Format) Software Requirements Reader: Adobe PDF Reader (Free) Unzipping: Winzip or equivalent (Free) ⚙️ Engine Specifications Primary Engine Engine Code: M110 (most likely for 280 models) Configuration: Inline-6 cylinder, DOHC Displacement Liters: 2.8 Displacement Cc: 2799 Performance Horsepower Approx: 155-185 hp (depending on market and specific variant) Torque Approx: 230-240 Nm (depending on market and specific variant) Fuel System Injection System: Bosch K-Jetronic mechanical fuel injection (likely) Fuel Type: Unleaded gasoline (Octane rating as per manufacturer) Maintenance Spark Plugs: Refer to manual for specific type and gap (e.g., Bosch W8AC, W8AP) Ignition Timing: Refer to manual for static and dynamic timing specifications (degrees BTDC). 🔧 Transmission Standard Type: Typically a 4-speed automatic (e.g., 4G-TRONIC) or 4-speed manual transmission. Optional Type: Availability of a 5-speed manual transmission in later models or specific markets. Features Fluid Type: Refer to manual for specific Automatic Transmission Fluid (ATF) specifications (e.g., Dexron II). Maintenance Fluid Change Interval: Typically 30,000 - 50,000 miles or as specified in the manual. 📐 Dimensions Exterior Body Styles: Sedan (W123), Coupe (C123), Estate/Wagon (S123), potentially Limousine (V123). Weights Curb Weight Approx: 1400-1600 kg (depending on body style and equipment). 🛡️ Safety Features Passive Features Seatbelts: Standard front seat belts; rear seat belts and three-point belts in many variants. Construction: Reinforced passenger safety cell, crumple zones. 💡 Technology Features Infotainment Features: Basic AM/FM radio with cassette player (optional), analog instrumentation. Driver Assistance Features: Power steering, cruise control (optional), anti-lock braking system (ABS) introduced later in the production run for some models. 🔧 Maintenance Service Intervals Oil Change Interval: Typically 5,000 - 10,000 miles or annually, depending on usage and oil type. Air Filter Replacement: 15,000 - 30,000 miles or as needed based on conditions. Fuel Filter Replacement: 20,000 - 40,000 miles or as specified. Fluid Specifications Engine Oil Type: Refer to manual; typically SAE 10W-40 or 15W-40 for gasoline engines, API SG or higher. Coolant Type: Ethylene glycol-based antifreeze mixed with distilled water (typically 50/50). Brake Fluid Type: DOT 3 or DOT 4 hydraulic brake fluid. Known Issues Common Problems: Rust/corrosion (wheel arches, sills, door bottoms), vacuum line issues, fuel distributor...