🏷️ Basic Information Identification Make: BMW Model: 3 Series Chassis Code: E21 Model Year: 1978 Generation Generation Code: E21 Production Start Year: 1975 Production End Year: 1983 Codes Engine Codes Covered: M10 (4-cylinder), M20 (6-cylinder) 👋 Introduction Market Position Positioning: High-quality, vehicle-specific factory repair manual for enthusiasts and professionals maintaining the iconic BMW E21 3 Series. Competitive Analysis Advantage: Direct access to dealer-level information, crucial for accurate diagnosis and repair of this classic German sports sedan. Key Features Feature 1: Vehicle-specific, factory-issued content. Feature 2: Complete A-Z repair coverage. Feature 3: Includes diagrams, illustrations, and wiring schematics. Feature 4: Digital format offers convenience and portability. Feature 5: Empowers owners to perform their own maintenance and repairs. 📋 Manual Details Coverage Areas Model Variants Covered: All E21 3 Series models (e.g., 316, 318, 320, 320i, 323i) Repair Scope: Comprehensive A-Z repairs Page Count Estimated Page Count: N/A (Digital Format) Manual Type Type: Service and Repair Manual Language Language: English Format Format: PDF Digital Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac 📖 Manual Coverage Systems Covered Engine: Engine overhaul, diagnostics, performance tuning, cooling system, lubrication system, fuel delivery and control, emission control systems, intake and exhaust systems. Drivetrain: Clutch, manual transmission, automatic transmission, transfer case (if applicable), propeller shaft, drive shafts, differential, axle, suspension systems (front and rear), steering system (column, power steering). Brakes: Brake control systems, hydraulic brake systems, parking brake, brake pad/shoe replacement, caliper/wheel cylinder service, brake bleeding procedures, drum and disc brake systems. Electrical: Ignition system, starting system, charging system (alternator/generator, starter motor, battery), lighting systems, instrumentation, meters, audio/visual systems, horn, windshield wipers and washers, door locks, power windows (if equipped), engine immobilizer, cruise control. Body And Interior: Bodywork, exterior trim, interior trim, seats, seat belts, supplemental restraint systems (airbags, if present), windshield, glass, mirrors, instrument panel, engine hood, doors. Climate Control: Air conditioning system service and repair. Wheels And Tires: Tire and wheel specifications, mounting, balancing. Multiplex Communication: CAN communication systems (relevant to the era). Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, tune-ups, inspections. Diagnostics: Troubleshooting guides, symptom-based diagnostics, common fault identification. Repair: Step-by-step instructions for component removal, overhaul, and installation across all covered systems. Technical Data: Specifications, torque values, clearances, test procedures, wiring schematics. Technical Depth Depth: Factory-level, detailed diagnostic and repair procedures for technicians and advanced DIY enthusiasts. Accuracy: Vehicle-specific, not generic; identical to dealership technician manuals. 📊 Manual Specifications File Format Format Type: PDF Searchability: Implied searchable text within PDF Print Quality Printability: Yes, individual pages or sections can be printed. Image Scalability: Yes, diagrams and illustrations can be enlarged for printing. Binding Type Binding: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) Requirements Software Requirements: Adobe PDF Reader, Winzip (free) ⚙️ Engine Specifications Primary Engine Engine Family: M10 (4-cylinder) and M20 (6-cylinder) 4 Cylinder Variants: 2.0L (e.g., 318, 320), 1.8L (e.g., 316) 6 Cylinder Variants: 2.3L (e.g., 323i), 2.0L (e.g., 320/6) Performance Typical Hp Range: 75 hp (316) to 143 hp (323i) Typical Torque Range: 120 Nm (316) to 205 Nm (323i) Fuel System Fuel Delivery: Carburetor (e.g., Solex, Zenith) for most models, Bosch K-Jetronic fuel injection for 320i and 323i. Fuel Type: Unleaded Gasoline (premium recommended for higher compression variants) Cooling System Type: Liquid-cooled Lubrication Oil Type Recommendation: API SG or SH, SAE 20W-50 or 10W-40 (refer to manual for precise viscosity based on climate) Ignition System Type: Distributor-based ignition system (e.g., Bosch) 🔧 Transmission Standard Type 4 Cylinder: 4-speed Manual Transmission Type 6 Cylinder: 4-speed or 5-speed Manual Transmission Optional Automatic Transmission: 3-speed Automatic Transmission (e.g., ZF 3HP18, 3HP22) available on most models. Features Clutch Type: Dry single-plate clutch Transmission Fluid Manual: Manual Gearbox Oil (e.g., SAE 75W-90 GL-4) Transmission Fluid Automatic: ATF Dexron II (or equivalent) 📐 Dimensions Exterior Wheelbase: Approx. 2563 mm (100.9 in) Length: Approx. 4360 mm (171.7 in) Width: Approx. 1670 mm (65.7 in) Height: Approx. 1380 mm (54.3 in) Weights Curb Weight Range: Approx. 1150 kg - 1300 kg (2535 lbs - 2866 lbs) depending on engine and equipment. 🛡️ Safety Features Ratings Era Safety Standards: Compliant with 1970s automotive safety standards; lacks modern active safety systems. Focus on passive safety elements. Active Features Active Safety: Four-wheel disc brakes on most higher-performance models (e.g., 323i); disc front/drum rear on others. Generally effective braking for its era. Passive Features Passive Safety: Rigid safety cage, energy-absorbing steering column, padded dashboard, three-point seat belts (standard front, optional rear). Windshield Glass: Laminated safety glass for windshield, toughened glass for side and rear windows. 💡 Technology Features Infotainment Infotainment Systems: Basic analog radio systems, optional cassette players. Limited in-car entertainment features by modern standards. Driver Assistance Driver Assistance Systems: None by modern definition. Focus on driver feedback and control. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000 - 10,000 km (3,000 -...