🏷️ Basic Information Identification Make: Mercedes-Benz Model: 280E Codes Chassis Code: W123 Generation Generation Designation: First Generation W123 Generation Years: 1975-1985 👋 Introduction Market Position Market Segment: Mid-size luxury sedan/saloon. Competitive Analysis Key Competitors: BMW 5 Series (E28), Audi 100/200, Volvo 240/700 Series, Jaguar XJ Series. Key Features Brand Reputation: Renowned for build quality, durability, safety, and engineering excellence. Model Philosophy: Emphasis on robust engineering, comfort, and a sophisticated driving experience, often referred to as 'over-engineered'. 📋 Manual Details Coverage Areas Covered Years: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Page Count Estimated Page Count: Approximately 500-700 pages (typical for comprehensive workshop manuals of this era) Manual Type Manual Type: Workshop Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical (M110 inline-6), fuel injection (Bosch K-Jetronic), ignition system, cooling system, lubrication system, emission controls. Transmission Systems: 4-speed manual transmission, 4-speed automatic transmission (optional), clutch, driveshaft, differential. Chassis And Suspension: Front suspension (independent, double wishbone), rear suspension (independent, semi-trailing arm), steering system (power assisted), braking system (front discs, rear discs). Electrical And Electronics: Wiring diagrams, battery, charging system (alternator), starting system, lighting system, instrument cluster, HVAC controls, power accessories (windows, locks, antenna). Body And Interior: Body structure, exterior trim, doors, windows, seating, interior trim, HVAC system. Procedures Included Maintenance Procedures: Scheduled maintenance, oil changes, filter replacements, spark plug replacement, fluid checks and changes, belt inspections and replacement. Repair Procedures: Engine overhaul, transmission overhaul, brake caliper rebuild, suspension component replacement, steering gear repair, electrical component diagnosis and replacement. Troubleshooting Guides: Diagnostic flowcharts for common driveability issues, electrical faults, and mechanical problems. Special Tools And Techniques: Identification and usage of specialized Mercedes-Benz tools required for specific repairs. Technical Depth Depth Of Coverage: Comprehensive, covering routine maintenance, component-level repair, complete engine and transmission rebuilds, and detailed diagnostic procedures. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable PDF, allowing for efficient information retrieval. Print Quality Print Readability: Designed for clear on-screen viewing and printing. High-resolution images and diagrams. Binding Type Binding Description: N/A (Digital PDF format) Paper Type Paper Description: N/A (Digital PDF format) ⚙️ Engine Specifications Primary Engine Engine Code: M110.984 (likely for 280E) Engine Type: Inline 6-cylinder, SOHC (Single Overhead Camshaft) Displacement: 2746 cc (2.7 Liters) Performance Horsepower Gross: 185 PS (182 hp; 136 kW) @ 5800 rpm (approximate, may vary slightly by market/year) Torque Gross: 245 Nm (181 lb-ft) @ 4000 rpm (approximate) Fuel System Fuel Delivery: Bosch K-Jetronic (CIS - Continuous Injection System) mechanical fuel injection. Fuel Type: Unleaded gasoline (RON 95 or higher recommended) Ignition System Ignition Type: Breakerless electronic ignition (Bosch) 🔧 Transmission Standard Transmission Standard Gearbox: 4-speed manual transmission Optional Transmission Optional Gearbox: 4-speed automatic transmission (Optional, often referred to as 'Hydrak' or '4G-Tronic') Features Transmission Fluid Spec: MB 236.2 (for Automatic Transmission) Clutch Type: Single dry plate, hydraulically operated (for manual transmission) Differential Type: Hypoid rear axle differential 📐 Dimensions Exterior Length: 4725 mm (186.0 in) Width: 1786 mm (70.3 in) Height: 1425 mm (56.1 in) Wheelbase: 2795 mm (110.0 in) Weights Curb Weight: Approx. 1400-1500 kg (3086-3307 lbs) Gross Vehicle Weight: Approx. 1900 kg (4189 lbs) Wheel Bolt Pattern: 5x112 mm Wheel Size: 14-inch or 15-inch wheels were common. 🛡️ Safety Features Ratings Crash Test Results: While formal crash test ratings as we know them today were less common, Mercedes-Benz vehicles of this era were designed with advanced safety features for their time, including a strong safety cage, crumple zones, and padded interior. Active Features Braking System Type: Power-assisted hydraulic disc brakes front and rear. Steering Assistance: Power steering Passive Features Seatbelts: Three-point inertia-reel seat belts (standard in front, often optional in rear). Steering Column: Collapsible steering column. Dashboard Design: Padded dashboard and steering wheel. 💡 Technology Features Infotainment Audio System: Factory-installed AM/FM radio with cassette player was common, often with optional premium sound system. Dashboard Controls: Analog gauges for speedometer, tachometer, fuel level, engine temperature, oil pressure, and clock. HVAC controls integrated into the center console. Driver Assistance Cruise Control: Optional cruise control system available on many models. Connectivity Connectivity Features: No modern connectivity features like Bluetooth or USB. Primarily mechanical and electrical systems. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 10,000 km (6,000 miles) or 12 months, whichever comes first. Major Service Intervals: Significant inspections and component checks recommended at 30,000 km (20,000 miles) or 24 months. Fluid Specifications Engine Oil Spec: API SG or higher; Viscosity: SAE 15W-40 or 10W-40 depending on climate (refer to manual for specific recommendations). Coolant Spec: Mercedes-Benz approved coolant concentrate (e.g., G48) mixed with distilled water in a 50/50 ratio. Brake Fluid Spec: DOT 4 Power Steering Fluid Spec: MB 236.3 (ATF Dexron II or equivalent) Fuel Filter Replacement: Recommended every 20,000 km (12,000 miles) for K-Jetronic system....