🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 - 280E Model Generation: First Generation W123 Codes Chassis Code: W123 Engine Code: M110 (2.8L Inline-6) 👋 Introduction Market Position Era Significance: The W123 generation represented Mercedes-Benz's commitment to build quality, durability, and engineering excellence in the mid-to-late 1970s and early 1980s. Competitive Analysis Contemporary Rivals: Competed against luxury sedans from BMW (e.g., 5 Series), Audi, Jaguar, and Volvo, often praised for its robust build and longevity. Key Features Engineering Philosophy: Over-engineered for durability and long-term reliability, reflecting Mercedes-Benz's 'best or nothing' ethos of the period. Safety Emphasis: Introduced significant safety advancements for its time, including improved crash structures and driver controls. 📋 Manual Details Coverage Areas Model Years Covered: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Specific Model Variant: 280E Page Count Estimated Page Count: Over 800 pages (typical for comprehensive factory manuals of this era) Manual Type Manual Type: Factory Service & Repair Workshop Manual Language Language: English Format Digital Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine overhaul, cylinder head, pistons, crankshaft, camshafts, timing components, lubrication system, cooling system Engine Electrical: Ignition system (Bosch K-Jetronic fuel injection and ignition control), starter system, alternator, battery Fuel System: Bosch K-Jetronic fuel injection system diagnostics, fuel pump, fuel filter, injectors, fuel pressure regulator, fuel tank Transmission: 4-speed Manual Transmission (G4/27), 4-speed Automatic Transmission (722.1) - overhaul, adjustments, fluid service Drivetrain: Clutch (manual), driveshaft, universal joints, rear axle differential, half-shafts Suspension: Front independent suspension (double wishbone), rear independent suspension (semi-trailing arm), shock absorbers, springs, ball joints, bushings Steering: Power steering system (Bosch recirculating ball), steering column, steering gear, tie rods, idler arm Brakes: Front ventilated discs, rear discs, brake system hydraulics, master cylinder, brake calipers, brake pads, brake fluid specifications, parking brake Electrical System: Wiring diagrams, lighting system, instruments, gauges, switches, fuses, relays, battery, starter, alternator Body And Chassis: Body construction, door mechanisms, window regulators, hinges, latches, interior trim, exterior trim, corrosion protection HVAC: Heating system, ventilation system, air conditioning (optional) system Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, spark plug replacement, fluid checks and top-ups, belt inspections and replacement Troubleshooting: Diagnostic procedures for common issues, symptom-based troubleshooting guides Repair: Step-by-step instructions for component removal, repair, and reinstallation across all major systems Diagnostics: Detailed diagnostic procedures for engine management, fuel injection, ignition, and electrical systems Adjustments: Valve adjustments, idle speed adjustments, ignition timing adjustments, parking brake adjustments Technical Depth Depth Of Coverage: Comprehensive - covers everything from routine maintenance to full engine and transmission rebuilds, including detailed specifications and tolerances. Diagnostic Tools: Information on specialized tools and diagnostic equipment used by Mercedes-Benz technicians during the W123 era. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Likely text-searchable PDF, allowing quick keyword lookups. Print Quality Digital Quality: High resolution, suitable for printing individual pages or sections. Binding Type Digital Access: Instant download, no physical binding. Paper Type Digital Format: N/A (Digital Product) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder, Naturally Aspirated Engine Code: M110.984 (or similar variants) Displacement: 2746 cc (2.8 Liters) Bore X Stroke: 86.0 mm x 78.7 mm Compression Ratio: 8.7:1 (typical for Euro spec, may vary) Performance Horsepower: 185 PS (metric horsepower) @ 5800 rpm (approx. 182 bhp) Torque: 240 Nm (approx. 177 lb-ft) @ 4000 rpm (approx.) Fuel System Fuel Injection: Bosch K-Jetronic (CIS - Continuous Injection System) mechanical fuel injection Fuel Type: Unleaded Gasoline (Premium Octane Recommended) Engine Layout Cylinder Configuration: Inline 6 Engine Features Valve Train: Single Overhead Camshaft (SOHC) per bank, 2 valves per cylinder (M110 engine is DOHC - Double Overhead Camshaft, 4 valves per cylinder, correction from common assumption) 🔧 Transmission Standard Standard Transmission Type: 4-Speed Manual (G4/27) Optional Optional Transmission Type: 4-Speed Automatic (722.1) Features Automatic Transmission Mode: Standard (P, R, N, 3, 2) or Optional (P, R, N, D, 2, 1) shift patterns depending on year/market. Fluid Specifications Automatic Transmission Fluid: MB 236.6 (e.g., Dexron II compatible fluids of the era) 📐 Dimensions Exterior Length: 4725 mm (approx. 186 inches) Width: 1790 mm (approx. 70.5 inches) Height: 1420 mm (approx. 55.9 inches) Wheelbase: 2795 mm (approx. 110 inches) Weights Curb Weight: 1450 - 1550 kg (approx. 3200 - 3420 lbs) 🛡️ Safety Features Ratings Crash Test Data: While formal ratings like NHTSA's were less standardized in this era, the W123 was renowned for its robust construction and safety cage, contributing to excellent occupant protection. Active Features Braking System: Four-wheel disc brakes, typically with front ventilated discs; power assisted. Steering System: Recirculating ball power steering. Passive Features Body Structure: Reinforced passenger compartment, crumple zones front and rear. Seat Belts: Standard three-point seat belts (front); lap belts often standard in rear. Steering Column: Collapsible steering column. 💡 Technology Features Infotainment Audio System: Typically a Blaupunkt or Becker AM/FM radio with...