🏷️ Basic Information Identification Make: BMW Model: 3 Series Model Variant: 320i Generation: E21 Codes Chassis Code: E21 👋 Introduction Market Position Positioning: Essential resource for owners and mechanics of the BMW E21 generation Competitive Analysis Advantage: Official factory data, comprehensive coverage, cost savings over shop labor Key Features Feature 1: Hundreds of pages of detailed repair information Feature 2: Illustrations, diagrams, and photos for clarity Feature 3: Direct replacement for factory-trained technician knowledge Feature 4: Enables informed maintenance and repair decisions Feature 5: Cost-saving potential compared to professional labor rates Feature 6: Numbered instructions and table of contents for easy navigation Feature 7: Enlarged inset diagrams for close examination of parts 📋 Manual Details Coverage Areas Covered Years: 1975-1984 Covered Models: BMW 320, BMW 320i Trim Levels: All styles covered All Styles Covered: Yes Page Count Estimated Page Count: Hundreds of pages Manual Type Type: Factory Service Repair Manual Origin: Official Factory Manual Language Language: English Format File Format: PDF Delivery Method: Downloadable 📖 Manual Coverage Systems Covered Engine Service Repair: Yes Transmission Service Repair: Yes Brake System: Yes Wiring Diagram: Yes Electrical System: Yes Suspension: Yes Periodic Lubrication: Yes Steering: Yes Cooling System: Yes Fuel Injection Fuel System: Yes Emission System: Yes Heater Air Conditioning: Yes Engine Control System: Yes Chassis Body: Yes Restraint System: Yes Interior: Yes Differential Drive: Yes Axle: Yes Procedures Included General Maintenance: Yes Troubleshooting: Yes Repair Procedures: Step-by-step Diagnostic Procedures: Advanced troubleshooting guide Rebuilding Refurbishing: Yes Tuning: Yes Technical Depth Depth: Complete coverage of all diagnostic and repair procedures User Level: Suitable for DIY owners and professional technicians Detail Level: Detailed substeps, notes, cautions, and warnings Illustrations: Detailed illustrations, drawings, and photos Diagnostics: Integrated troubleshooting and electrical service with wiring diagrams 📊 Manual Specifications File Format Resolution: High resolution Searchability: Searchable functionality for quick information retrieval Storage: Can be saved to hard drive or burned to CD-ROM Print Quality Printability: Printable without restriction (individual pages or entire manual) Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Software Requirements Reader: Adobe PDF Reader Os Compatibility: Windows and Mac operating systems ⚙️ Engine Specifications Primary Engine Engine Family: BMW M10 (various displacements) Engine Description: Inline-4 cylinder, SOHC Performance Horsepower Range: Approximately 100-115 hp (depending on year and specific model) Torque Range: Approximately 110-125 lb-ft (depending on year and specific model) Fuel System Fuel Delivery: Fuel Injection (Bosch L-Jetronic or similar variants) Fuel Type: Unleaded Gasoline 🔧 Transmission Standard Type: 4-speed Manual Optional Type: 3-speed Automatic (ZF) Features Clutch Type: Hydraulically operated single dry plate clutch 📐 Dimensions Exterior Body Styles: 2-door Sedan, 2-door Convertible (factory-produced only for early years, later Alpina/custom conversions) Weights Curb Weight: Approx. 2600-2700 lbs (1180-1225 kg) 🛡️ Safety Features Ratings Crash Safety: Era-appropriate safety features, likely lacking modern advanced ratings Active Features Active Safety: Four-wheel disc brakes (later models may have rear drums), Recirculating ball steering Passive Features Passive Safety: Seat belts, Energy-absorbing steering column 💡 Technology Features Infotainment Infotainment System: Basic analog radio, optional cassette player Driver Assistance Driver Assistance: None in the modern sense; focus is on mechanical feedback and driver engagement. 🔧 Maintenance Service Intervals Oil Change: Typically every 3,000-5,000 miles or 6 months Spark Plugs: Refer to manual for specific interval, typically every 20,000-30,000 miles Fluid Specifications Engine Oil Type: Refer to manual for specific API classification (e.g., API SF or SG), viscosity likely 10W-40 or 20W-50 Coolant Type: Ethylene Glycol based antifreeze with corrosion inhibitors Brake Fluid Type: DOT 3 or DOT 4 Transmission Fluid Type Manual: GL-4 rated gear oil (e.g., SAE 75W-90 or 80W-90) Transmission Fluid Type Automatic: Dexron III (or equivalent) Differential Fluid Type: GL-5 rated gear oil (e.g., SAE 80W-90) Known Issues Issue 1: Rust and corrosion, especially in wheel wells and rocker panels Issue 2: Degradation of rubber components (hoses, bushings, seals) Issue 3: Fuel injection system (L-Jetronic) can be sensitive to maintenance and component health Issue 4: Carburetor issues (on earlier non-injected models, though this manual specifies 'i') Issue 5: Electrical gremlins due to age and wiring insulation degradation 📚 Vehicle History Brand Heritage Heritage: BMW's reputation for sporty driving dynamics and build quality Model Evolution Evolution: The E21 was BMW's first 3 Series, establishing the compact executive sports sedan segment. It replaced the 2002 and laid the groundwork for all subsequent 3 Series generations. Production Production Years: 1975-1983 Manufacturing Locations: Germany (various BMW plants) 🏆 Awards & Recognition Recognitions Recognition Type: Considered a landmark vehicle for its segment, often praised for handling and driver feel. Ratings Rating Context: Contemporary reviews often highlighted its sporty chassis and refined driving experience compared to competitors.