🏷️ Basic Information Identification Make: Mercedes-Benz Model: 280E Chassis Code: W123 Applicable Years: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985 Codes Engine Code Primary: M110 Engine Code Variants: M110.984 (2.8L) 👋 Introduction Market Position Positioning: The Mercedes-Benz 280E (W123) was positioned as a robust, luxurious, and technically advanced executive sedan in its era. Competitive Analysis Competitors: Competed with other premium sedans of the period such as BMW 5 Series, Audi 100, and Jaguar XJ. Key Features Distinctiveness: Renowned for its build quality, durability, sophisticated engineering, and comfortable ride. Significance: Represents a significant era for Mercedes-Benz, known for its timeless design and engineering excellence. Manual Value Target Audience: Owners, mechanics, and enthusiasts seeking to maintain and repair their classic Mercedes-Benz 280E. 📋 Manual Details Coverage Areas Primary Coverage: All major mechanical and electrical systems for the Mercedes-Benz 280E (W123 chassis). Secondary Coverage: Bodywork, interior components, specifications, troubleshooting, diagnostic procedures. Page Count Estimated Pages: 1000+ Manual Type Type: Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete overhaul, tuning, fuel injection (Bosch K-Jetronic), ignition system, cooling, lubrication. Transmission: Manual and automatic transmission repair, clutch, driveshaft, differential. Brakes: Hydraulic system, brake calipers, master cylinder, parking brake, ABS (if equipped). Suspension Steering: Front and rear suspension, power steering, steering gear, wheel alignment. Electrical: Wiring diagrams, starter, alternator, battery, lighting, instrumentation, power windows, central locking. Body Chassis: Body repair, doors, hood, trunk, glass, bumpers, chassis lubrication. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, tune-ups, fluid checks. Diagnostics: Troubleshooting guides, fault diagnosis for engine, transmission, electrical systems. Repair: Detailed step-by-step repair instructions for all major components. Rebuilds: Engine and transmission rebuild procedures, including component specifications and tolerances. Adjustments: Carburetor adjustments, fuel injection system adjustments, ignition timing adjustments. Technical Depth Depth: Comprehensive, from basic maintenance to complete engine and transmission overhauls, including advanced diagnostics. 📊 Manual Specifications File Format File Type: PDF Searchability: Text-searchable for quick information retrieval. Printability: Printable pages for workshop use. Resolution: High-resolution scans for clear diagrams and text. Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Inline-6 Cylinder, SOHC Displacement: 2746 cc (2.8 Liters) Bore X Stroke: 86.0 mm x 79.0 mm Compression Ratio: 8.0:1 (typical) Performance Horsepower: 185 PS (approx. 182 hp) at 5800 rpm (DIN) Torque: 23.5 kg⋅m (approx. 230 Nm or 170 lb-ft) at 4000 rpm (DIN) Fuel System Fuel Delivery: Bosch K-Jetronic Mechanical Fuel Injection Fuel Type: Unleaded Gasoline (Octane rating typically 91-98 RON) Lubrication Oil Capacity: 7.0 Liters (7.4 US Quarts) with filter Cooling Coolant Capacity: Approx. 10.0 Liters (10.6 US Quarts) 🔧 Transmission Standard Transmission Type: 4-speed Manual Transmission (M-B Type 717.400) Optional Transmission Type: 4-speed Automatic Transmission (optional) (M-B Type 722.1) Features Auto Transmission Features: Hydraulic torque converter, often with a selector for Economy/Standard modes. Fluid Specifications Automatic Transmission Fluid: MB 236.2 (e.g., Dexron II compatible) Manual Transmission Fluid: MB 235.1 (GL-4 SAE 80/90 Gear Oil) 📐 Dimensions Exterior Length: 4725 mm (186.0 in) Width: 1790 mm (70.5 in) Height: 1430 mm (56.3 in) Wheelbase: 2805 mm (110.4 in) Weights Curb Weight: Approx. 1550 kg (3417 lbs) - varies by transmission and options Gross Vehicle Weight Rating: Approx. 2050 kg (4519 lbs) 🛡️ Safety Features Ratings Crash Test Data: No standardized crash test ratings (e.g., NHTSA, Euro NCAP) readily available for this era, but known for robust construction. Active Features Brakes: Front ventilated disc brakes, rear solid disc brakes. Optional ABS on later models. Steering: Recirculating ball power steering (standard or optional depending on year/market). Passive Features Body Structure: Reinforced safety cell, impact-absorbing steering column, side-impact protection beams (in later W123s). Restraints: Seat belts (front and rear). Airbags were not standard on most W123 models. 💡 Technology Features Infotainment Audio System: Typically an AM/FM radio with cassette player. High-end options might include premium sound systems. Climate Control: Manual ventilation and heating. Optional automatic climate control (Thermotronic) on higher trims or later models, often vacuum-actuated. Driver Assistance ABS: Anti-lock Braking System (ABS) became available as an option on later models, typically from the mid-1980s. Connectivity Connectivity Features: Limited by era. Key features would include power windows, power door locks (often vacuum-operated), cruise control (optional). 🔧 Maintenance Service Intervals Oil Change Interval: Every 10,000-15,000 km (6,000-9,000 miles) or 12 months, whichever comes first. Air Filter Replacement: Every 30,000-40,000 km (18,000-25,000 miles). Fuel Filter Replacement: Every 30,000-40,000 km (18,000-25,000 miles). Spark Plug Replacement: Every 40,000-60,000 km (25,000-37,000 miles). Transmission Fluid Change: Automatic: Every 40,000-60,000 km (25,000-37,000 miles). Manual: Inspect at 60,000 km, replace if needed. Fluid Specifications Engine Oil Grade: API SG/SH or higher; SAE 10W-40 or 15W-40 recommended for general use. Consult manual for specific climate recommendations (e.g., 5W-40 for cold). Coolant Type: Ethylene glycol-based coolant, mixed 50/50 with distilled water. Brake Fluid Type:...