🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 280C Model Code: W123 Body Style: Coupe (C-pillar styling) Generation Generation Code: First Generation W123 Codes Engine Code Primary: M110 👋 Introduction Market Position Class: Executive Compact Car / Personal Luxury Coupe Target Audience: Discerning buyers seeking quality, durability, comfort, and sophisticated engineering. Competitive Analysis Competitors: BMW 3 Series (E21), Audi 80/Fox, Volvo 240, Peugeot 505, Cadillac Seville (earlier models). Key Features Build Quality: Renowned for exceptional build quality, longevity, and robust construction. Comfort And Refinement: Supple ride quality, quiet cabin, high-quality interior materials, and ergonomic design. Engineering: Solid engineering principles, advanced for its time, leading to a durable and reliable vehicle. Coupe Styling: Distinctive pillarless coupe design offering a sleek and elegant profile. 📋 Manual Details Coverage Areas Manual Type: Service and Repair Manual Language: English Format: PDF Digital Format Features: Searchable Text, Bookmarked Chapters, Printable Page Count Estimated Page Count: Approximately 800-1200 pages (typical for comprehensive manuals of this era, though exact PDF count can vary) 📖 Manual Coverage Systems Covered Engine: Complete overhaul, diagnosis, lubrication system, cooling system, fuel injection (Bosch K-Jetronic), ignition system, emission control systems. Transmission: Automatic Transmission (e.g., 4-speed 722.1), manual transmission (if applicable for the specific market/build), diagnosis, repair, fluid specifications. Drivetrain: Rear-wheel drive system, driveshaft, differential, axle shafts, diagnosis and repair. Suspension: Front and rear suspension components, springs, shock absorbers, bushings, alignment procedures, diagnosis. Brakes: Hydraulic system, disc brakes (front and rear), brake fluid specifications, replacement, bleeding, parking brake, ABS (if equipped). Steering: Power steering system, steering box, tie rods, linkage, diagnosis and repair. Electrical: 12V electrical system, battery, alternator, starter motor, lighting systems, gauges, switches, wiring diagrams, fuses, relays, troubleshooting. Body And Chassis: Body panel removal and installation, rust repair, interior trim, glass replacement, door mechanisms, locks, hinges. HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system components, refrigerant, diagnosis and repair. Procedures Included Maintenance: Routine oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspection and adjustment. Troubleshooting: Systematic diagnostic procedures for common and uncommon faults, symptom-based troubleshooting guides. Repair: Step-by-step instructions for component removal, repair, and reinstallation across all major vehicle systems. Disassembly Assembly: Detailed instructions for engine disassembly, transmission overhaul, brake caliper rebuild, etc. Specifications: Torque specifications for critical fasteners, component measurements, tolerances. Technical Depth Depth: Comprehensive, from basic scheduled maintenance to complete engine and transmission rebuilds, including electrical system diagnostics and body repair. 📊 Manual Specifications File Format File Type: Portable Document Format (PDF) File Quality: High-resolution scans of original factory documentation, ensuring clarity of text and diagrams. Print Quality Scalability: Printable at various sizes, suitable for workshop use or individual study. Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Quality: N/A (Digital PDF format, but designed to emulate high-quality manual paper) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder, DOHC (Double Overhead Camshaft) Engine Code: M110.984 (typically) Displacement: 2.8 Liters (2799 cc) Performance Horsepower Net SAE: Approximately 155-160 hp @ 5000-5500 rpm (depending on market and exact configuration) Torque Net SAE: Approximately 170-175 lb-ft @ 3500-4000 rpm (depending on market and exact configuration) Fuel System Fuel Injection: Bosch CIS (Continuous Injection System) - K-Jetronic Fuel Type: Unleaded gasoline (premium octane recommended) Ignition System Ignition Type: Electronic Ignition with Distributor Cooling System Cooling Type: Liquid-cooled Lubrication System Oil Capacity: Approximately 6.5 Liters (6.9 US Quarts) with filter change 🔧 Transmission Standard Transmission Type: 4-speed Automatic Transmission (722.1 series) Optional Manual Transmission Availability: Optional in some markets, typically a 4-speed or 5-speed manual. Features Automatic Features: Hydraulic torque converter, planetary gear sets, controlled by hydraulic pressure and governor. Fluid Specifications Automatic Transmission Fluid Type: Mercedes-Benz Specification 236.1 (e.g., Mobil ATF 220, Dexron II) Fluid Capacity Automatic Transmission Fluid Capacity: Approximately 8-9 Liters (8.5-9.5 US Quarts) for complete fill/overhaul 📐 Dimensions Exterior Wheelbase: Approximately 2795 mm (110.0 inches) Length: Approximately 4725 mm (186.0 inches) Width: Approximately 1790 mm (70.5 inches) Height: Approximately 1420 mm (55.9 inches) Weights Curb Weight: Approximately 1500-1600 kg (3300-3500 lbs), varies with equipment Gross Vehicle Weight Rating: Approximately 2050 kg (4520 lbs) Wheels And Tires Standard Wheel Size: 14-inch or 15-inch alloy or steel wheels Standard Tire Size: 175 R14, 185/70 R14, 195/70 R14 (market dependent) Bolt Pattern: 5 x 112 mm 🛡️ Safety Features Ratings Crash Test Data: While formal NHTSA/IIHS ratings as known today were not prevalent, the W123 was engineered with significant emphasis on structural integrity and occupant protection for its era, featuring a robust passenger cell and safety crumple zones. Active Features Brakes System: Four-wheel disc brakes with dual-circuit hydraulic system. Passive Features Steering Column: Collapsible steering column for improved impact protection. Seat Belts: Standard front seat belts, optional rear seat belts. Lap and shoulder belts often standard in front. Interior Design: Soft-touch dashboard materials, padded surfaces, and recessed controls to minimize injury in a collision. 💡 Technology...