🏷️ Basic Information Identification Make: BMW Model: 3-series Generation: E21 Model Year: 1980 Codes Chassis Code: E21 👋 Introduction Market Position Target Audience: BMW E21 owners, independent repair shops, automotive enthusiasts Competitive Analysis Value Proposition: Provides factory-level repair information, eliminating reliance on generic guides or expensive dealership services. Key Features Content Depth: Vehicle-specific, not generic; exact same information used by dealership technicians. Ease Of Use: Single, easy-to-use PDF manual, reducing the need to flip through multiple physical books. Portability: Printable pages for taking into the garage or workshop, avoiding damage to the digital file. 📋 Manual Details Coverage Areas Models Covered: All 3-series (E21) models Repair Scope: A-Z repairs Page Count Page Count: Not Specified (Comprehensive) Manual Type Manual Type: Factory Service and Repair Manual Language Language: English Format Format: Digital PDF 📖 Manual Coverage Systems Covered Engine: Complete Engine Service, Diagnosis, and Repair Control System: Engine Control System Diagnosis and Repair Mechanical: Comprehensive Mechanical Systems Fuel System: Fuel Service Specifications and Procedures Emission Control: Emission Control Systems Service and Diagnosis Cooling System: Intake, Exhaust, and Cooling System Service Lubrication System: Lubrication System Service and Specifications Charging System: Ignition, Starting, and Charging System Service Transmission Auto: Automatic Transmission and Clutch Service Transmission Manual: Manual Transmission Service and Repair Drivetrain: Transfer Propeller Shaft, Drive Shaft, and Differential Service Suspension Steering: Axle, Suspension, Tire & Wheel, Steering Column, and Power Steering Service Brakes: Brake Control, Brake, and Parking Brake Systems Service HVAC: Air Conditioning System Service and Repair Safety Restraint: Supplemental Restraint System (SRS) and Seat Belt Service Security: Engine Immobilizer and Door Lock Systems Service Driver Controls: Cruise Control Systems Service Wiper Washer: Wiper and Washer Systems Service Instrumentation: Instrument Panel and Meter Service Audio Visual: Audio/Visual Systems Service Body Interior: Exterior and Interior Trim, Seat, Engine Hood/Door, Windshield/Glass Mirror Service Electrical Chassis: Chassis Electrical Systems Service Body Electronics: Multiplex/CAN Communication Systems Service Lighting: Lighting Systems Service (Headlights, Taillights, Interior Lights) Horn: Horn System Service Procedures Included Maintenance Procedures: Routine Maintenance, Fluid Changes, Filter Replacements Diagnostic Procedures: Step-by-step diagnosis for all systems, troubleshooting guides Repair Procedures: Complete step-by-step repair instructions for all components Installation Procedures: Instructions for component replacement and installation Rebuilding Procedures: Detailed procedures for rebuilding major components (e.g., engines, transmissions) Technical Depth Depth: Factory-level technical depth, suitable for professional technicians and advanced DIYers Documentation Types Diagrams: Included Illustrations: Included Wiring Schematics: Included (Comprehensive) Specifications: Included (Detailed technical specifications) 📊 Manual Specifications File Format File Format: PDF Searchable Text: Yes Print Quality Printability: All pages printable Image Scaling: Images can be blown up and printed enlarged Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF - printable on user's choice of paper) Compatibility Operating Systems: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac Compatible Requirements Software Requirements: Adobe PDF Reader, Winzip (free online) ⚙️ Engine Specifications Primary Engine Engine Types Covered: BMW M10 4-cylinder (e.g., 316, 318, 320i) and M20 6-cylinder (e.g., 323i) engines Performance Performance Details: Covers specifications, troubleshooting, and repair for all engine variants of the E21 generation. Fuel System Fuel System Service: Detailed coverage of carbureted and fuel-injected systems (e.g., Bosch L-Jetronic for 'i' models). 🔧 Transmission Standard Standard Transmission: 4-speed and 5-speed manual transmissions Optional Optional Transmission: 3-speed ZF automatic transmission Features Transmission Coverage: Service, repair, and adjustment procedures for both manual and automatic transmissions. 📐 Dimensions Exterior Body Styles: 2-door sedan (Saloon) Weights Curb Weight: Approx. 2,500 - 2,800 lbs (1134 - 1270 kg) depending on engine and options 🛡️ Safety Features Ratings Safety Era Context: Reflects safety standards of the late 1970s and early 1980s. Active Features Active Safety: Four-wheel disc brakes (on most models), independent suspension, power-assisted brakes (optional). Passive Features Passive Safety: Safety-designed steering column, reinforced passenger compartment, seat belts. 💡 Technology Features Infotainment Infotainment Features: Basic analog gauges, optional radio and cassette player. No digital or advanced infotainment features. Driver Assistance Driver Assistance Features: Primarily mechanical systems. No electronic driver assistance systems (e.g., ABS, traction control, airbags were not standard or common). Connectivity Connectivity Features: N/A (No modern connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, check manual for specific intervals. Tune Up Interval: Spark plug replacement, timing adjustment, carburetor/fuel injection system checks as recommended. Fluid Specifications Engine Oil Spec: API SF or SG rated, viscosity 10W-40 or 20W-50 depending on climate (e.g., Castrol GTX, Valvoline VR1). Coolant Spec: BMW Antifreeze/Coolant (blue) or equivalent ethylene glycol-based coolant, mixed 50/50 with distilled water. Transmission Fluid Manual: GL-4 rated gear oil, e.g., 75W-90 or 80W-90. Transmission Fluid Auto: Dexron-III (or equivalent) automatic transmission fluid. Brake Fluid Spec: DOT 3 or DOT 4 brake fluid. Known Issues Common Issues: Rust (especially around wheel wells, rockers, strut towers), aging rubber components (bushings, hoses), electrical connector corrosion, fuel system wear...