🏷️ Basic Information Identification Make: Mercedes-Benz Model: 280 CE Year: 1981 Generation Chassis Code: W123 Codes Engine Code Designation: M110 👋 Introduction Market Position Vehicle Class: Mid-size Luxury Coupe Target Audience: Owners and independent mechanics seeking detailed information for servicing, repairing, and maintaining the Mercedes-Benz 280 CE (W123) Coupe. Competitive Analysis Competitors Era: BMW 3 Series Coupe (E21), Audi Coupe GT, Porsche 944 (later in the generation) Key Features Vehicle Appeal: Known for Mercedes-Benz's build quality, engineering, comfort, and timeless styling. The W123 coupe offered a more sporting and luxurious alternative to the sedan. Manual Value Proposition Confidence Booster: Empowers owners to confidently perform repairs and maintenance, reducing reliance on costly dealership services. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Maintenance, Troubleshooting, Restoration Specific Topics: Engine, Fuel System, Ignition System, Cooling System, Exhaust System, Transmission (Manual & Automatic), Clutch, Drivetrain, Suspension, Steering, Brakes, Electrical System, Body, Interior, HVAC, Diagnostic Procedures, Wiring Diagrams Page Count Estimated Pages: Comprehensive (Specific page count not provided, but implied to be extensive covering all diagnostic and repair procedures). Manual Type Type: Factory-Authorized Service and Repair Manual Language Language: English Format Delivery Format: Digital Download (PDF/WINRAR) Compatibility: Windows 95/98/ME/XP/Vista/7/8, Linux, MAC, iOS, Android 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder head, valve train, pistons, connecting rods, crankshaft, oil pump, timing gear, lubrication system Fuel System: Fuel injection system (Bosch K-Jetronic), fuel pump, fuel filter, fuel lines, injectors, air flow meter, fuel pressure regulator Ignition System: Ignition coil, distributor, spark plugs, spark plug wires, ignition timing Cooling System: Radiator, water pump, thermostat, coolant hoses, expansion tank, fan clutch, heater core Exhaust System: Exhaust manifolds, catalytic converter (if equipped), muffler, exhaust pipes, oxygen sensor Transmission Manual: Clutch assembly, master cylinder, slave cylinder, manual gearbox (4-speed or 5-speed), shift linkage, gears, bearings Transmission Automatic: Automatic gearbox (e.g., 4-speed 722.1), torque converter, valve body, transmission fluid and filter change, checking fluid level Drivetrain: Driveshaft, universal joints, flexible couplings, rear axle, differential, half-shafts Suspension Front: Independent front suspension, control arms, ball joints, steering knuckle, coil springs, shock absorbers Suspension Rear: Independent rear suspension, semi-trailing arms, shock absorbers, coil springs, level control (if equipped) Steering: Power steering system, steering gearbox, steering column, steering linkage, steering wheel Brakes: Hydraulic brake system, disc brakes (front and rear), brake pads, brake calipers, brake rotors, brake lines, brake fluid, master cylinder, parking brake Electrical System: Battery, charging system (alternator), starting system (starter), lighting system (headlights, taillights, interior lights), dashboard indicators, wiring harnesses, fuses, relays, ignition switch Body Exterior: Body panels, doors, hood, trunk lid, bumpers, glass, sunroof, convertible top (if applicable), door hinges, locks, windshield wipers, washer system Interior: Seats, dashboard, interior trim, seat belts, climate control system (HVAC), radio/cassette deck, speakers HVAC: Heating, ventilation, air conditioning system, refrigerant charge, dust filter, charcoal filter, recirculating air filter, blower motor Procedures Included Routine Maintenance: Oil and filter change, air filter replacement, fuel filter replacement, spark plug inspection/replacement, V-belt inspection/adjustment, fluid level checks (coolant, power steering, brake, transmission, differential), tire pressure adjustment, lubricating chassis components Engine Repair: Valve clearance adjustment, idle speed adjustment, injection timing adjustment, component replacement (e.g., injectors, fuel pump, ignition components, cooling system parts, exhaust components) Transmission Repair: Manual transmission oil change and level correction, automatic transmission fluid and filter change, checking transmission fluid level, potential internal component diagnosis (though full rebuild procedures are implied) Suspension Steering Repair: Ball joint inspection, checking steering play, retightening steering bolts, axle oil level checks and correction, inspecting flexible couplings Brake Repair: Brake fluid replacement, brake pad and disc inspection, parking brake adjustment, brake system testing Electrical Diagnostics: Checking warning and indicator lamps, battery fluid level check, troubleshooting electrical faults Body Cosmetic Repair: Water leakage and corrosion inspection, cleaning water drains, lubricating door hinges and locks, sunroof rail maintenance, checking body for paint damage HVAC Repair: AC refrigerant charge check, replacing dust filter, replacing active charcoal filter, replacing recirculating air filter Troubleshooting: Comprehensive troubleshooting guides for various systems, including engine performance, starting issues, braking problems, electrical faults, and more. Technical Depth Depth: Extensive. Covers everything from basic maintenance to detailed repair and rebuilding procedures. Includes diagnostic steps, component testing, and specifications required for professional-level work. Visual Aids: Diagrams, illustrations, and wiring schematics are explicitly mentioned, providing crucial visual guidance. 📊 Manual Specifications File Format Primary Format: PDF Compression Format: WINRAR (implies potential for multiple files or a compressed archive) Print Quality Printability: Assumed to be high quality and printable, as is standard for service manuals. Binding Type Binding: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder, Naturally Aspirated Engine Code: M110 (E28 for fuel injection) Displacement: 2.8 Liters (2746 cc) Bore X Stroke: 86.5 mm x 80.25 mm Compression Ratio: 8.3:1 (typical for M110.981/M110.984) Performance Horsepower: Approx. 142-155 hp @ 5250-5500 rpm (depending...