🏷️ Basic Information Identification Make: BMW Model: 3 Series Chassis Code: E21 Production Years Covered: 1975-1983 Codes Product Name: BMW 3 Series E21 Workshop Repair Manual 1975-1983 👋 Introduction Market Position Historical Context: The E21 was BMW's first dedicated 3 Series, establishing the benchmark for compact executive sedans with a focus on sporty driving dynamics, build quality, and refined engineering. This manual provides access to the factory-level knowledge required to maintain these classic vehicles. Competitive Analysis Comparative Advantage: Competed against vehicles like the Mercedes-Benz W123, Audi 80, and Alfa Romeo Alfetta, offering a more driver-focused experience. This manual ensures owners and technicians can maintain that original driving feel. Key Features Value Proposition: Provides access to the same detailed, manufacturer-approved repair and diagnostic information used by official BMW dealerships, enabling professional-level servicing and troubleshooting for the E21 generation. Accessibility: Digital format (PDF) offers immediate download access, cross-platform compatibility, and easy navigation through its structured content. 📋 Manual Details Coverage Areas Engines Covered: M10 4-cylinder (e.g., M10B18, M10B20), M20 6-cylinder (e.g., M20B20, M20B23) Body Styles Covered: 2-door Sedan, Convertible (Baur) Page Count Estimated Page Count: Thousands of pages (typical for comprehensive factory workshop manuals) Manual Type Type: Workshop Service and Repair Manual Language Language: English (assumed based on product description) Format Format: Acrobat PDF Compatibility: Windows & MAC compatible 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical (M10, M20 series), Fuel injection (Bosch K-Jetronic, L-Jetronic), Ignition system, Cooling system, Exhaust system Drivetrain: Manual transmission, Automatic transmission, Clutch, Drive shafts, Differential, Axles Chassis: Front suspension (MacPherson struts), Rear suspension (semi-trailing arms), Steering system (recirculating ball, power steering option), Brakes (front disc, rear drum/disc), Wheels and tires Electrical: Wiring diagrams, Battery, Alternator, Starter motor, Lighting system, Instrumentation, Fuses and relays, Ignition switches Body: Body panels, Doors, Hood, Trunk lid, Glass, Interior trim, Seats, Bumpers Procedures Included Maintenance: Oil changes, Filter replacements, Spark plug service, Brake fluid flush, Coolant flush, Belts and hoses inspection/replacement, Tune-ups Repair: Engine rebuilds, Cylinder head service, Piston/ring replacement, Crankshaft bearing service, Transmission overhaul, Clutch replacement, Brake caliper/master cylinder rebuild, Suspension component replacement, Steering rack/box repair, Electrical component diagnosis and replacement Diagnostics: Troubleshooting guides for common issues, Engine performance diagnostics, Electrical system fault finding, Fuel system testing Technical Data: Torque specifications, Fluid capacities, Diagnostic trouble codes (DTCs) if applicable, Measurement specifications Technical Depth Depth: Comprehensive - covering all aspects from routine maintenance to full engine and transmission rebuilds, including detailed diagnostic procedures and electrical schematics. 📊 Manual Specifications File Format Digital Format: PDF (Portable Document Format) Searchability: Searchable text (typical for professionally produced PDFs) Print Quality Printability: Printable pages for workshop use Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Family: BMW M10 (4-cylinder) Displacement Variants M10: 1.8L (M10B18), 2.0L (M10B20) Secondary Engine Family: BMW M20 (6-cylinder) Displacement Variants M20 Displacement Variants M20: 2.0L (M20B20), 2.3L (M20B23) Performance Typical Horsepower Range: 75 hp (1.8L carb) to 143 hp (2.3L fuel injected) Typical Torque Range: 130 Nm (1.8L) to 205 Nm (2.3L) Fuel System Fuel Delivery Carbureted: Single/Dual Solex Zenith carburetors (e.g., 40 DIDTA) Fuel Delivery Injected: Bosch K-Jetronic (CIS), Bosch L-Jetronic (less common) Engine Management Ignition System: Mechanical distributor with breaker points or electronic ignition (later models) Fuel Management: Mechanical fuel injection control unit (for K-Jetronic) 🔧 Transmission Standard Transmission Type Standard: 4-speed Manual Optional Transmission Type Optional: 3-speed Automatic (ZF 3 HP 12 or 14) Features Clutch Type: Single dry plate, hydraulically operated Final Drive Ratio: Varies by model and transmission (e.g., 3.64:1, 3.91:1) 📐 Dimensions Exterior Wheelbase: Approximately 2570 mm (101.2 in) Length: Approximately 4370 mm (172.0 in) Width: Approximately 1610 mm (63.4 in) Height: Approximately 1380 mm (54.3 in) Weights Curb Weight: Approximately 1150 - 1250 kg (2535 - 2755 lbs) depending on engine and equipment Gross Vehicle Weight Rating: Typically around 1600 kg Cargo Trunk Volume: Approx. 470 liters (16.6 cubic feet) 🛡️ Safety Features Ratings Crash Test Performance: Limited official crash test data available for the era, but known for robust construction typical of German cars. Active Features Braking System: Front: Ventilated discs; Rear: Drums (standard), Discs (optional on some models) Parking Brake: Mechanical, acting on rear wheels Passive Features Seatbelts: Standard 3-point front seatbelts, optional rear lap belts Headrests: Standard front headrests Steering Column: Collapsible steering column 💡 Technology Features Infotainment Audio System: Optional factory radio with analog tuning and cassette player. Aftermarket upgrades common. Driver Assistance ABS: Not typically available on early E21 models. Became optional or standard on later variants of 3 Series. Power Steering: Optional on most models, enhancing maneuverability. Connectivity OBD: No On-Board Diagnostics (OBD) port in the modern sense. Diagnostics rely on mechanical checks, voltage readings, and visual inspection as detailed in the manual. 🔧 Maintenance Service Intervals Oil Change Interval: Typically 5,000-7,500 miles or 6-12 months, depending on...