🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 Body Styles: Sedan (W123.003, W123.004, W123.030), Coupe (C123.043), Wagon (S123.003, S123.004, S123.030) Generation Generation Name: First Generation W123 Codes Chassis Code: W123 👋 Introduction Market Position Target Audience: Mercedes-Benz W123 owners and independent mechanics seeking factory-level repair and maintenance information. Competitive Analysis Value Proposition: Provides comprehensive, accurate, and factory-sourced information at a fraction of the cost of dealership labor, enabling DIY repairs and proactive maintenance. Key Features Manual Benefits: Enables self-maintenance, servicing, diagnosis, and repair; saves money on labor; provides clear, detailed instructions and visuals for efficient job completion. 📋 Manual Details Coverage Areas Covered Models: 230, 280 E, 280 CE Covered Years: 1977, 1978, 1979, 1980, 1981 Covered Engines: All gasoline engines (2.0L, 2.3L, 2.8L) Page Count Estimated Page Count: Extensive (typical factory service manuals for this era are several hundred pages) Manual Type Manual Type: Factory Service Repair Workshop Manual Language Language: English Format File Format: HTML Compatibility: All Versions of Windows & Mac Printability: All pages are printable Software Requirements: Adobe PDF Reader & WinZip 📖 Manual Coverage Systems Covered Major Systems: Engine Mechanical, Fuel System, Ignition System, Cooling System, Lubrication System, Electrical System, HVAC, Transmission, Drivetrain, Suspension, Steering, Brakes, Bodywork, Interior Equipment, Climate Control, Windows, Doors, Seats, Seat Belts, Central Locking System, Sliding Roof Engine Mechanical: Cylinder head, engine block, crankshaft, pistons, connecting rods, camshafts, valve train, timing belt/chain, engine mounts. Fuel System: Fuel tank, fuel pump, fuel lines, fuel filter, carburetors (e.g., Solex, Zenith), mechanical fuel injection (Bosch K-Jetronic), injectors, pressure regulators. Ignition System: Distributor, ignition coil, spark plugs, ignition wires, ignition timing adjustment, electronic ignition components (if applicable). Cooling System: Radiator, coolant hoses, thermostat, water pump, fan, expansion tank, heater core. Lubrication System: Oil pan, oil pump, oil filter, oil cooler (if equipped), oil galleries, oil pressure checks. Electrical System: Battery, alternator, starter motor, fuse box, wiring harnesses, lighting systems (headlights, taillights, interior), dashboard instruments, relays, switches, ignition switch. Transmission Drivetrain: Manual transmission overhaul, automatic transmission service and repair, clutch assembly, driveshaft, universal joints, rear axle differential, axle shafts. Suspension Steering: Front suspension (e.g., double wishbone, ball joints, control arms), rear suspension (e.g., independent trailing arms), shock absorbers, springs, steering box, tie rods, steering linkage, power steering pump, steering column. Brakes: Front brake calipers, rotors, pads; rear brake drums, shoes, wheel cylinders; brake master cylinder, brake booster, brake lines, brake fluid replacement. Body And Interior: Door mechanisms, window regulators, seat adjustment, seat belts, interior trim panels, headliner, dashboard components, sunroof operation and sealing, central locking system hydraulics/vacuum. HVAC Climate Control: Heater core, blower motor, air conditioning system (if equipped, including compressor, condenser, evaporator, refrigerant), ducting, control mechanisms, temperature sensors, vacuum actuators. Procedures Included Repair And Maintenance: Complete repair procedures, maintenance schedules, diagnostic procedures, step-by-step instructions, exploded views and diagrams Troubleshooting: Diagnostic tables, symptom-based troubleshooting guides, common problem identification. Assembly Disassembly: Detailed instructions for removing, inspecting, repairing, and reinstalling all major components and sub-assemblies. Technical Data Specs: Torque specifications for fasteners, engine compression test procedures and values, bearing clearances, timing specifications. Technical Depth Depth Of Coverage: Comprehensive; covers everything from basic maintenance and fluid checks to engine rebuilds, electrical troubleshooting, and component replacement. Equivalent to dealer/mechanic level documentation. Technical Areas Specific Technical Areas: Engine timing, carburetor/fuel pump service, mechanical gasoline injection systems, emission controls, wiring diagrams, propeller shaft, wheels and tires, automatic climate control, sliding roof mechanisms, central locking systems. 📊 Manual Specifications File Format Digital Format: HTML Digital Accessibility: Instant download format reduces shipping time and cost, providing immediate access to repair information. Print Quality Digital Resolution: High (suitable for printing of diagrams and text) Binding Type Digital Delivery: Instant Download Paper Type Digital Media: N/A (Digital File) ⚙️ Engine Specifications Primary Engine Engine Options: Inline-4 (2.3L), Inline-6 (2.8L) Performance Typical Horsepower Range: Approx. 94 HP (230) to 185 HP (280E/CE) Typical Torque Range: Approx. 160 Nm (230) to 235 Nm (280E/CE) Fuel System Fuel Delivery Systems: Carbureted (e.g., Solex, Zenith) for some 230 variants, Bosch K-Jetronic mechanical fuel injection for 280E/CE and later 230 models. Engine Cooling Cooling System Type: Pressurized liquid cooling system with a fan (engine-driven or viscous coupling). Engine Lubrication Lubrication System Type: Wet sump lubrication system with oil pump and oil filter. 🔧 Transmission Standard Transmission Options: 4-speed manual, 5-speed manual (later models), 4-speed automatic (optional). Optional Automatic Transmission: 4-speed automatic (e.g., 4G-Tronic). Features Transmission Fluid Type: Refer to manual for specific DEXRON II or equivalent for automatic transmissions. Manual transmission fluid type varies. 📐 Dimensions Exterior Wheelbase: Approx. 2794 mm (110 in) Length: Approx. 4725 mm (186 in) for Sedan Weights Curb Weight: Approx. 1300-1500 kg (2866-3307 lbs) depending on model and equipment. 🛡️ Safety Features Ratings Historical Safety Features: Robust body structure, crumple zones, padded dashboard, safety steering column, dual-circuit hydraulic brakes, seat belts. Active Features Braking System: Front...