🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 280E Model Code: W123 Engine Variant: 280E Generation Generation Name: First Generation W123 Generation Years: 1976-1985 Codes Chassis Code: W123 Engine Code: M110 👋 Introduction Market Position Segment: Luxury Mid-size Sedan/Coupe/Estate Key Selling Points: Build quality, durability, safety, comfort, engineering excellence. Competitive Analysis Competitors: BMW 5 Series (E28), Audi 100, Volvo 240, Jaguar XJ. Key Features Design Philosophy: Robust construction, understated luxury, enduring design. Powertrain Emphasis: Smooth inline-six engines, refined ride, strong build quality. 📋 Manual Details Coverage Areas Vehicle Years Covered: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Specific Models Covered: 280E Page Count Estimated Page Count: Over 1000 pages (typical for a comprehensive workshop manual of this era) Manual Type Manual Type: Complete Workshop Service Repair Manual Language Language: English Format Format: Digital Download (PDF) 📖 Manual Coverage Systems Covered Engine: Engine mechanicals, fuel injection (Bosch K-Jetronic), ignition system, cooling system, lubrication system, engine diagnostics and troubleshooting. Transmission: Manual and Automatic (4-speed and 5-speed manual, 4-speed automatic) transmission overhaul, repair, adjustments, and fluid specifications. Drivetrain: Clutch, driveshafts, differential, rear axle assembly, wheel bearings, lubrication. Brakes: Hydraulic system, disc brakes (front and rear), brake calipers, master cylinder, brake lines, parking brake, ABS (if equipped for later models), troubleshooting. Suspension: Front independent suspension (double wishbone), rear independent suspension (semi-trailing arm), shock absorbers, springs, sway bars, steering knuckle, bushings, alignment specifications. Steering: Power steering system, steering box, tie rods, steering column, steering wheel removal and installation, lubrication. Electrical System: Wiring diagrams, battery, alternator, starter motor, lighting system, instrumentation, horn, wipers, power windows, central locking, troubleshooting, fuse/relay identification. Fuel System: Fuel tank, fuel pump, fuel lines, fuel filter, fuel injectors, fuel pressure regulation, emissions control systems (e.g., air injection). Cooling System: Radiator, fan, water pump, thermostat, heater core, coolant specifications, flushing and filling procedures. Exhaust System: Exhaust manifold, catalytic converter (if applicable), mufflers, pipes, hangers, gaskets. Body And Interior: Body panel removal and installation, doors, windows, seats, dashboard, trim, sound deadening, rust prevention and repair. Climate Control: HVAC system, air conditioning service, heater controls, blower motor, evaporator, condenser, refrigerant types and capacities. Procedures Included Maintenance: Scheduled maintenance (oil changes, filter replacements, spark plug replacements, drive belt checks), lubrication points, fluid level checks, tune-up procedures. Troubleshooting: Systematic diagnostic procedures for common and uncommon faults across all major vehicle systems, symptom-based diagnosis. Repair: Step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation. Overhaul: Detailed procedures for complete engine, transmission, and differential overhauls, including internal component specifications and clearances. Adjustment: Precise procedures for adjusting ignition timing, fuel mixture, valve clearances, clutch engagement, and brake systems. Diagnostics: Diagnostic charts, fault codes interpretation (where applicable), and testing procedures for electrical and mechanical components. Specifications: Torque specifications for all fasteners, engine clearances, alignment data, fluid capacities, and component tolerances. Technical Depth Depth: Comprehensive, suitable for professional mechanics and advanced DIY enthusiasts. Covers everything from basic maintenance to complete engine and transmission rebuilds. 📊 Manual Specifications File Format File Type: PDF Searchable Text: Yes (typically, depending on the source scan quality) Printable: Yes Print Quality Quality: High resolution scans of original factory documentation Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Name: M110 Inline-6 Engine Type: Naturally Aspirated, SOHC (Double Overhead Camshaft) Displacement: 2.8 Liters (2799 cc) Bore X Stroke: 86.0 mm x 80.25 mm Compression Ratio: 8.0:1 or 8.7:1 (depending on market/year) Performance Horsepower: Approx. 180-185 PS (132-136 kW) at 5800 rpm (DIN) Torque: Approx. 240-245 Nm (177-181 lb-ft) at 4000 rpm (DIN) Fuel System Fuel Delivery: Bosch D-Jetronic or K-Jetronic Fuel Injection Fuel Type: Unleaded gasoline (premium/super) Engine Management Ignition System: Electronic ignition (e.g., Breakerless Electronic Ignition) 🔧 Transmission Standard Transmission Type: 4-speed manual transmission (Type 717.400) Optional Transmission Type: 4-speed automatic transmission (722.1xx series) Optional Transmission Years: Available across all specified years Features Fluid Type Automatic: MB Specification 236.1 (e.g., Dexron II) Fluid Capacity Automatic: Approx. 7.5 - 8.0 Liters (total system capacity) 📐 Dimensions Exterior Wheelbase: 2800 mm (110.2 in) Length: 4725 mm (186.0 in) Width: 1790 mm (70.5 in) Height: 1420 mm (55.9 in) Weights Curb Weight: Approx. 1500-1550 kg (3300-3417 lbs) Gross Vehicle Weight: Approx. 2050 kg (4519 lbs) Towing Capacity: Not typically specified or recommended for US market models 🛡️ Safety Features Ratings Crash Test Data: While formal US NHTSA/IIHS ratings for this era are scarce, the W123 was renowned for its robust safety cage, crumple zones, and strong pillar design, earning a reputation for exceptional passive safety. Active Features Brakes: Four-wheel disc brakes (ventilated front, solid rear), ABS optional from 1980 onwards. Steering: Recirculating ball steering system with power assist. Passive Features Body Construction: Reinforced safety cell, energy-absorbing steering column, laminated windshield, shatter-resistant side and rear glass. Seat Belts: Front 3-point inertia reel seatbelts, rear lap belts...