🏷️ Basic Information Identification Make: Mercedes-Benz Model: W123 E-Class Year: 1976 Generation Generation Designation: W123 (First Generation) Codes Chassis Code: W123 Model Code: 123.0XX ( Sedan), 123.1XX (Estate), 123.05X (Coupe), 123.19X (Chassis) 👋 Introduction Market Position Positioning: The Mercedes-Benz W123 series was positioned as a premium, reliable, and durable executive sedan, estate car, and coupe, known for its engineering quality and longevity. Competitive Analysis Competitors: Competed with vehicles like the BMW 5 Series (E12/E28), Audi 100, and Volvo 240 series, often perceived as more luxurious and robust. Key Features Vehicle Highlights: Exceptional build quality, robust mechanicals, comfortable ride, sophisticated styling, and a reputation for enduring reliability, especially with diesel variants. Manual Value Value Proposition: Essential for owners and independent mechanics seeking accurate, manufacturer-specific repair information, enabling proper maintenance and restoration of these classic vehicles. 📋 Manual Details Coverage Areas Scope: All models and all repairs A-Z for the 1976 W123 E-Class Page Count Estimated Pages: 800+ Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: Print (likely spiral-bound or paperback) 📖 Manual Coverage Systems Covered Engine: Detailed diagnostics, overhaul, and repair for all gasoline and diesel engines offered in 1976, including M115, M110, OM615, OM616, OM617. Fuel System: Carburetor service (Zenith, Solex) and fuel injection systems (Bosch K-Jetronic for gasoline, mechanical injection for diesel). Ignition System: Distributor timing, coil, spark plugs, breaker points (where applicable), electronic ignition systems. Transmission: Manual and automatic transmission (4-speed, 5-speed manual, 3-speed automatic) overhaul, service, and adjustments. Drivetrain: Clutch, driveshaft, universal joints, differential, axle shafts, wheel bearings. Suspension: Front independent suspension (double wishbone), rear independent suspension (multi-link), shock absorbers, springs, anti-roll bars, bushings. Steering: Power steering system, steering box, tie rods, steering linkage. Brakes: Front disc brakes, rear drum brakes, hydraulic system, brake lines, master cylinder, calipers, wheel cylinders, parking brake. Electrical System: Wiring diagrams, starter, alternator, battery, lighting, horn, wipers, heater blower, instrumentation, fuse box. Body And Chassis: Body panel removal/installation, door mechanisms, window regulators, locks, interior trim, underbody coating. Heating And Air Conditioning: HVAC system service, heater core, blower motor, air conditioning components (if factory-equipped). Procedures Included Maintenance: Routine service intervals, fluid changes, filter replacements, lubrication points, belt tensioning. Troubleshooting: Diagnostic charts, symptom-based troubleshooting for mechanical and electrical issues. Repair: Step-by-step instructions for component removal, disassembly, cleaning, inspection, repair, and reassembly. Overhaul: Complete engine, transmission, and differential rebuild procedures. Adjustments: Valve adjustments, idle speed, carburetor adjustments, ignition timing, brake adjustments. Specifications: Torque specifications for all fasteners, clearances, tolerances, and fluid capacities. Technical Depth Depth: Comprehensive, from basic maintenance to complete engine and transmission overhauls, including detailed diagnostic procedures. 📊 Manual Specifications File Format Digital Format: N/A (Print Manual) Print Quality Print Quality: High-quality paper and printing, designed for workshop durability. Binding Type Binding: Likely Perfect Bound or Spiral Bound for lay-flat usability. Paper Type Paper Type: Durable, semi-gloss paper suitable for workshop environments. ⚙️ Engine Specifications Primary Engine Engine Options 1976: 2.5L Inline-4 (M115), 2.8L Inline-6 (M110), 2.4L Diesel Inline-4 (OM615), 3.0L Diesel Inline-5 (OM617). Performance Horsepower Range: Approx. 70-130 hp (depending on engine and market). Torque Range: Approx. 100-170 lb-ft (depending on engine). Fuel System Gasoline Fuel Delivery: Stromberg or Zenith Carburetors (e.g., 2.5L) or Bosch K-Jetronic Fuel Injection (e.g., 2.8L). Diesel Fuel Delivery: Bosch mechanical injection pumps with injectors. Technical Features Engine Construction: Cast iron block, aluminum alloy cylinder head (typically). 🔧 Transmission Standard Standard Transmission: 4-speed Manual Transmission Optional Optional Transmission: 4-speed or 3-speed Automatic Transmission (e.g., 722.1xx series) Features Automatic Features: Hydraulic torque converter, planetary gear sets. Fluid Specifications Automatic Transmission Fluid: MB Spec 236.2 (e.g., Dexron II or equivalent). 📐 Dimensions Exterior Wheelbase: Approx. 2797 mm (110.1 in) for Sedan/Coupe Length: Approx. 4765 mm (187.6 in) for Sedan Weights Curb Weight Range: Approx. 1400-1600 kg (3086-3527 lbs) Gross Vehicle Weight: Varies by model, consult specific chassis data. 🛡️ Safety Features Ratings Crash Safety: Built to high standards of passive safety for its era; advanced for the 1970s with crumple zones and safety cell construction. Active Features Active Safety Features: Four-wheel disc brakes (on some later models/variants, but 1976 primarily front discs/rear drums), power-assisted steering. Passive Features Passive Safety Features: Reinforced passenger compartment, energy-absorbing steering column, padded dashboard, safety glass. 💡 Technology Features Infotainment Infotainment Features: Basic analog radio (AM/FM), optional cassette player. No digital displays or advanced audio systems typical of modern vehicles. Driver Assistance Driver Assistance Features: Minimal to none by modern standards. Focused on mechanical feedback and driver control. Connectivity Connectivity Features: No provisions for external device connectivity (Bluetooth, USB, etc.). Chassis Technology Suspension Design: Sophisticated independent front and rear suspension for its time, contributing to excellent ride comfort and handling. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles (8,000-12,000 km) or 6-12 months, depending on driving conditions and engine type. Major Service Intervals: Spark plugs, fuel filters, air...