🏷️ Basic Information Identification Make: Mercedes-Benz Model: 280E Chassis Code: W123 Generation Generation Name: First Generation W123 Production Years Covered: 1976-1985 Codes Engine Code Variants: M110 (2.8L Inline-6) 👋 Introduction Market Position Target Audience: Professional Mercedes-Benz technicians, independent repair shops, and dedicated enthusiasts/owners with mechanical aptitude. Competitive Analysis Comparative Value: Offers superior technical depth and accuracy compared to generic repair manuals. Directly from Mercedes-Benz or authorized publishers. Key Features Diagnostic Emphasis: Strong emphasis on systematic troubleshooting and understanding the underlying principles of operation for each system. Historical Importance: The W123 chassis is revered for its build quality and durability, making a comprehensive manual essential for long-term preservation. 📋 Manual Details Coverage Areas Manual Type: Workshop Manual (WSM) / Service and Repair Manual Language: English Format: Likely a digital format (PDF, digital download) given the listing context, but original was print. Page Count Estimated Page Count: Comprehensive, typically 500+ pages for full WSMs of this era. 📖 Manual Coverage Systems Covered Powertrain: Engine (M110), Fuel System (Bosch K-Jetronic), Ignition System, Cooling System, Exhaust System, Transmission (Manual & Automatic) Chassis: Suspension (Front & Rear), Steering System, Brakes (Hydraulic, Disc/Drum configurations), Drivetrain (RWD, Driveshaft, Differential) Electrical: Complete Wiring Diagrams, Lighting System, Starting & Charging System, Instrumentation, HVAC Controls, Power Accessories Bodywork: Body Panel Removal/Installation, Interior Trim, Door Mechanisms, Glass Replacement, Seals Procedures Included Maintenance: Scheduled Maintenance (Oil Changes, Filter Replacements, Tune-ups), Fluid Checks and Replacements, Belt Adjustments Troubleshooting: Diagnostic Procedures for Engine Performance, Electrical Faults, Braking Issues, and other Common Problems; Fault Code Interpretation (where applicable for the era) Repair: Step-by-step instructions for component removal, overhaul, and reinstallation (e.g., Engine rebuilds, Transmission overhauls, Brake caliper replacement, Steering box rebuild) Technical Specifications: Torque values, P-Codes/Sympt codes for diagnostics, Alignment specifications, Timing settings, Engine clearances Technical Depth Diagnostic Capabilities: Advanced diagnostics leveraging mechanical knowledge and basic electrical testing. No OBD-II coverage as it predates the standard. Overhaul Procedures: Detailed procedures for complete engine and transmission overhauls, including disassembly, inspection, and reassembly. Special Tools: Identification and usage of specialized Mercedes-Benz tools required for specific repairs and adjustments. 📊 Manual Specifications File Format Digital Format Notes: Searchable text, clear illustrations, printable pages. Print Quality Original Print Quality: High-quality, durable paper stock with clear diagrams and photographs. Binding Type Original Binding: Typically case-bound or spiral-bound for ease of use in workshop environments. Paper Type Original Paper Type: Heavy-duty, often glossy paper for illustrations and durability. ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-Cylinder, SOHC Engine Code: M110 Displacement: 2746 cc (2.8 Liters) Bore X Stroke: 86.0 mm x 79.0 mm Compression Ratio: 8.0:1 or 8.2:1 (depending on market/variant) Performance Horsepower Net: Approx. 136-145 hp @ 5500 rpm (DIN) Torque Net: Approx. 217-220 Nm (160-162 lb-ft) @ 3500-4000 rpm (DIN) Fuel System Fuel Delivery: Bosch CIS (Continuous Injection System) / K-Jetronic Mechanical Fuel Injection Fuel Type: Unleaded Premium Gasoline (91-93 Octane) Ignition System Ignition Type: Breakerless Electronic Ignition (CDI or similar) Cooling System Cooling Type: Water-cooled Lubrication Oil Capacity With Filter: Approx. 7.5 Liters (8 US Quarts) 🔧 Transmission Standard Transmission Type: 4-Speed Manual Transmission (often denoted as 717.4) Optional Transmission Type: 4-Speed Automatic Transmission (722.1) Features Automatic Features: Torque converter, hydraulic control, selector positions (P, R, N, D, 2, 1) Fluid Specifications Manual Transmission Fluid: API GL-4 or GL-5, SAE 75W-90 or 80W-90 Automatic Transmission Fluid: MB 236.3 specification (e.g., Dexron II) 📐 Dimensions Exterior Length: Approx. 4730 mm (186.2 in) Width: Approx. 1790 mm (70.5 in) Height: Approx. 1430 mm (56.3 in) Wheelbase: Approx. 2810 mm (110.6 in) Weights Curb Weight: Approx. 1450 - 1550 kg (3197 - 3417 lbs), varies by equipment 🛡️ Safety Features Ratings Crash Test Era: Pre-dates modern standardized crash testing (NHTSA, Euro NCAP). Safety focused on structural integrity and passive restraint. Active Features Braking System: Front Ventilated Discs, Rear Discs or Drums (depending on year/market), Hydraulic Power Assist Steering System: Recirculating Ball with Power Assist (optional on some early models) Passive Features Body Structure: Reinforced passenger cell, crumple zones, safety door beams Restraints: Seat belts (3-point front, 2-point rear typical), padded dashboard and steering wheel 💡 Technology Features Infotainment Audio System: Typically an AM/FM radio with optional cassette player. Analog tuning, basic speaker configuration. Driver Assistance Cruise Control: Optional, mechanical cruise control system available on some models. Connectivity Early Automation: Power windows, power locks, and climate control (HVAC) were available as options, representing the era's premium features. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000 - 7,500 miles or annually, depending on driving conditions and oil quality used. Filter Replacement: Oil filter with every oil change. Air filter and fuel filter every 15,000 - 30,000 miles. Spark plugs every 30,000 miles. Transmission Service: Automatic transmission fluid and filter service every 30,000 - 50,000 miles. Manual transmission fluid check annually, change every 60,000 miles. Coolant Change: Every 2-3 years or...