🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 280E Codes Chassis Code: W123 Engine Code: M110 👋 Introduction Market Position Segment: Executive/Luxury Mid-size Sedan and Coupe (depending on body style of the 280E variant). Target Audience: Owners, independent repair shops, and enthusiasts seeking in-depth knowledge for maintenance and repair of the W123 280E. Competitive Analysis Competitors: BMW 5 Series (E28), Audi 100/200, Volvo 240/740, Jaguar XJ. Key Features Durability: Renowned for robust build quality and longevity, making a comprehensive service manual essential for continued operation. Engineering: Represents Mercedes-Benz's commitment to over-engineered, reliable vehicles with advanced (for the era) technology. 📋 Manual Details Coverage Areas Coverage: Comprehensive mechanical, electrical, and bodywork repairs for the Mercedes-Benz W123 280E. Page Count Page Count: Extensive (exact count not specified, but indicated as 'complete' and 'master') Manual Type Manual Type: Master Service and Repair Manual Language Language: English (typical for such manuals, assuming based on common market) Format Format: Digital (likely PDF) or Printed 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder head, crankshaft, pistons, connecting rods, valve train, timing chain, lubrication system, cooling system, fuel injection system (Bosch K-Jetronic), exhaust system. Engine Electrical: Ignition system, starter system, charging system (alternator), fuel pump, fuel injectors, engine control unit (ECU) diagnostics, wiring diagrams. Transmission: Automatic transmission (e.g., 4-speed 722.1), manual transmission (if applicable), clutch system (manual), gear selection, torque converter, transmission fluid system, valve body. Drivetrain: Rear axle, differential, drive shafts, universal joints, wheel bearings. Suspension: Front suspension (e.g., double wishbone), rear suspension (e.g., multi-link), shock absorbers, springs, control arms, bushings, steering knuckles. Steering: Power steering system, steering column, steering gearbox, tie rods, steering linkage. Brakes: Front and rear disc brakes, hydraulic system, brake calipers, brake pads, brake rotors, brake master cylinder, brake booster, parking brake system. Electrical System: Battery, starter, alternator, lighting system (headlights, taillights, interior lights), fuses, relays, wiring harnesses, dashboard instruments, horn, wipers, washers. HVAC: Heating, ventilation, and air conditioning (HVAC) system, blower motor, heater core, A/C compressor, refrigerant system, climate controls. Bodywork: Body panels, doors, hood, trunk, bumpers, glass, seals, interior trim, rust prevention, body repair techniques. Procedures Included Maintenance: Oil changes, filter replacements (oil, fuel, air), spark plug replacement, coolant flushes, brake fluid changes, transmission fluid changes, differential fluid changes, lubrication points. Troubleshooting: Diagnostic procedures for common engine, transmission, electrical, and HVAC issues. Fault code interpretation (if applicable). Repair: Step-by-step repair instructions for all major mechanical and electrical components, including engine rebuilds, transmission overhauls, brake system repairs, suspension component replacement. Installation: Instructions for replacing or installing components like alternators, starters, fuel pumps, brake calipers, shock absorbers. Adjustments: Carburetor adjustment (if applicable to variants), valve adjustments, ignition timing adjustments, idle speed adjustments. Technical Depth Depth: Expert level, covering everything from basic preventive maintenance to full engine and transmission overhauls, including detailed diagnostic procedures and electrical system troubleshooting. 📊 Manual Specifications File Format File Format: Likely PDF with searchable text and high-resolution diagrams. If printed, expect professional binding. Print Quality Print Quality: High quality with clear diagrams, schematics, and illustrations. (Assumed for a 'master' manual). Binding Type Binding Type: If printed, likely a durable wire-o or perfect binding for frequent use. Paper Type Paper Type: If printed, likely high-quality, thick paper to withstand shop environments. ⚙️ Engine Specifications Primary Engine Engine Type: Inline-six, naturally aspirated gasoline engine. Displacement: 2.8 Liters (2799 cc). Bore X Stroke: 86.5 mm x 80.25 mm (typical for M110). Compression Ratio: Typically 8.0:1 or 9.0:1 depending on market and specific variant. Performance Horsepower: Approximately 145-160 PS (143-158 hp) depending on specific engine variant and market regulations (e.g., DIN vs. SAE). Torque: Approximately 230-235 Nm (170-173 lb-ft) depending on specific engine variant. Fuel System Fuel Delivery: Bosch K-Jetronic mechanical fuel injection. Fuel Type: Unleaded gasoline (Premium Octane recommended). Fuel Pump Type: Mechanical, often a multi-cylinder diaphragm pump. 🔧 Transmission Standard Transmission Type: 4-speed automatic transmission (e.g., Mercedes-Benz 722.1). Optional Transmission Type: 4-speed or 5-speed manual transmission (availability varied by market and specific model year). Features Automatic Features: Hydraulic torque converter, planetary gear sets, hydraulic valve body for gear selection. 📐 Dimensions Exterior Length: Approx. 4725 mm (186.0 in) for Sedan. Width: Approx. 1786 mm (70.3 in). Height: Approx. 1427 mm (56.2 in) for Sedan. Wheelbase: Approx. 2795 mm (110.0 in). Weights Curb Weight: Approx. 1450-1550 kg (3197-3417 lbs) depending on body style and equipment. 🛡️ Safety Features Ratings Crash Test Performance: While specific official ratings from modern agencies are rare for this era, the W123 was known for its robust safety cage, crumple zones, and strong chassis structure, earning a reputation for durability and occupant protection. Active Features Braking System: Four-wheel disc brakes, often with front vented discs. Anti-lock braking system (ABS) was an optional feature on later models or specific variants. Passive Features Airbags: Driver's airbag became available as an option on later W123 models, but was...