🏷️ Basic Information Identification Make: BMW Model: 3 Series (E21) Sub Model: 320, 320i Codes Chassis Code: E21 Generation Production Years: 1975-1983 👋 Introduction Market Position Target Audience: Do-it-yourself enthusiasts and professional mechanics Competitive Analysis Advantage Over Print: Less expensive, more convenient, accessible on multiple devices Key Features Value Proposition: Inexpensive way to keep vehicle working properly, saving money on mechanics Accessibility: Instant access via download, no expiry dates 📋 Manual Details Coverage Areas Model Years Covered: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984 Variants Covered: All styles, including 320 and 320i Page Count Estimated Pages: Hundreds Manual Type Type: Factory Service Repair Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Mechanical Systems: Engine Service/Repair, Transmission Service/Repair, Brake System, Suspension, Steering, Cooling System, Fuel Injection, Fuel System, Emission System, Differential/Drive Axle, Chassis/Body Electrical Systems: Electrical System, Wiring Diagram, Engine Control System Comfort And Safety: Heater/Air Conditioner, Restraint System, Interior Procedures Included Repair Procedures: Step-by-step instructions based on complete disassembly Maintenance Procedures: General Maintenance, Periodic Lubrication Diagnostic Procedures: Troubleshooting Technical Depth Depth: Complete factory service information, suitable for DIY and experienced mechanics Visual Aids Illustrations: Hundreds of photos and illustrations 📊 Manual Specifications File Format File Type: PDF Searchability: Implied (standard for PDF manuals) Print Quality Printability: Printable (entirely or select pages) Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) Compatibility Operating Systems: All Versions of Windows AND Mac, Smartphones, Tablets (via web browser) Requirements Software: Adobe PDF Reader, Winzip ⚙️ Engine Specifications Primary Engine Engine Type: Inline 4-cylinder (M10 engine family) Performance Displacement: 2.0 Liters (approx. 1990 cc) Horsepower 320: Approx. 90-98 hp (depending on market and specific tune) Horsepower 320I: Approx. 100-105 hp (with Bosch L-Jetronic fuel injection) Fuel System Fuel Delivery 320: Carbureted (e.g., Solex 40 PII-4) Fuel Delivery 320I: Bosch L-Jetronic Fuel Injection 🔧 Transmission Standard Transmission Type Standard: 4-speed manual Optional Transmission Type Optional: 3-speed automatic (ZF 3HP18 or similar) Features Drive Layout: Rear-wheel drive (RWD) 📐 Dimensions Exterior Body Styles: 2-door sedan Weights Curb Weight Approx: 2400 - 2600 lbs (1090 - 1180 kg) 🛡️ Safety Features Passive Features Seatbelts: Standard 3-point front seatbelts, optional rear belts Steering Column: Collapsible steering column 💡 Technology Features Infotainment Radio System: Optional AM/FM radio, likely with analogue tuning. Driver Assistance Assistance Features: Limited to power steering (optional) and potentially early ABS on some later models or specific markets. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,000-5,000 miles or 6-12 months (refer to manual for exact specifications) Tune Up Interval: Every 12,000-15,000 miles Fluid Specifications Engine Oil Type: SAE 20W-50 or 10W-40 (API SF or higher, check manual) Coolant Type: Ethylene glycol based antifreeze (50/50 mix with distilled water) Brake Fluid Type: DOT 3 or DOT 4 Transmission Fluid Manual: GL-4 Gear Oil (e.g., 75W-90) Transmission Fluid Automatic: ATF Dexron II or equivalent Known Issues Common Problems: Rust (wheel arches, rocker panels), cooling system leaks (hose degradation, radiator), fuel distributor issues (on injected models), electrical gremlins, worn suspension bushings, aging rubber components. 📚 Vehicle History Brand Heritage Brand Focus: BMW is renowned for its 'Ultimate Driving Machine' ethos, focusing on performance and driver engagement. Model Evolution E21 Generation Role: The E21 was BMW's first dedicated 3 Series, establishing the compact executive sports sedan segment and succeeding the popular 02 Series. Production Manufacturing Locations: Primarily Germany, with some assembly in other locations. 🏆 Awards & Recognition Recognitions Segment Influence: The E21 3 Series is credited with defining the premium compact sports sedan segment and influencing countless vehicles that followed.