🏷️ Basic Information Identification Make: BMW Model: 3 Series Chassis Code: E21 Production Years Covered: 1975-1983 👋 Introduction Market Position Vehicle Segment: Compact Executive / Sports Sedan Bmw Philosophy: The E21 represented BMW's evolution into a more modern era, focusing on a driver-centric experience and advanced engineering for its time. Competitive Analysis Key Competitors: Mercedes-Benz W123 (200/300 series), Audi 80/Fox, Alfa Romeo Alfetta, Ford Granada, Opel Rekord Key Features Driver Focus: Renowned for its excellent handling, balance, and driver feedback, epitomizing the 'ultimate driving machine' ethos. Design Evolution: Introduced the signature 'Bangle butt' design cues, a more sculpted body, and a driver-oriented dashboard. Technical Advancements: Pioneered McPherson strut front suspension in a BMW sedan, refined engine technology, and optional fuel injection. 📋 Manual Details Coverage Areas Overall Coverage: Comprehensive workshop repair and service Specific Systems: Engine, transmission, drivetrain, suspension, steering, brakes, electrical system, fuel system, exhaust system, cooling system, body, interior, climate control Page Count Estimated Page Count: Extensive (typical for factory manuals of this era, likely 500+ pages) Manual Type Type: Factory Service Repair Workshop Manual Language Language: English (assumed, standard for global distribution) Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, disassembly, assembly, timing, cylinder head, block, pistons, crankshaft, camshafts Engine Performance And Tuning: Carburetor/fuel injection adjustment, ignition timing, performance tuning guidelines Fuel System: Fuel pump, fuel tank, fuel lines, carburetor models (Zenith, Solex, Pierburg), fuel injection systems (Bosch L-Jetronic for later models) Cooling System: Radiator, water pump, thermostat, fan, hoses, coolant specifications Exhaust System: Muffler, catalytic converter (later models), exhaust manifold, pipe routing, replacement procedures Transmission Manual: Gearbox overhaul, clutch replacement, shift linkage adjustment, fluid specifications Transmission Automatic: Automatic gearbox overhaul, fluid checks, adjustment procedures (if applicable to specific models) Drivetrain And Axles: Driveshafts, universal joints, differential overhaul, fluid specifications Suspension Front: MacPherson struts, control arms, ball joints, bushings, spring replacement, alignment specifications Suspension Rear: Trailing arms, shock absorbers, springs, bushings, semi-trailing arm bearings, alignment specifications Steering System: Steering rack, tie rods, steering column, power steering fluid (if equipped), adjustment Brake System Front: Disc brake calipers, pads, rotors, hydraulic lines, bleeding procedures Brake System Rear: Drum brakes (early models) or disc brakes (later models), shoes, drums/rotors, parking brake mechanism Electrical System Charging: Alternator, voltage regulator, battery, wiring diagrams Electrical System Ignition: Distributor, ignition coil, spark plugs, points (early models), electronic ignition systems, timing Electrical System Lighting: Headlights, taillights, turn signals, interior lighting, bulb specifications, wiring Electrical System Accessories: Wipers, horn, radio, power windows, power locks, starter motor, fuses, relays, wiring diagrams Body And Chassis: Body panel removal and installation, rust repair, structural components Interior Trim: Dashboard, door panels, upholstery, headliner, carpet removal and installation Climate Control: Heater core, blower motor, ventilation system, air conditioning (if factory equipped) repair and servicing Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks, spark plug replacement, belt adjustments, brake adjustments Troubleshooting: Diagnostic flowcharts, common problems and solutions, electrical diagnostics Major Repairs: Engine rebuilds, transmission overhauls, suspension component replacement, brake system repairs Component Disassembly And Assembly: Step-by-step guides with detailed instructions and diagrams for all major components Technical Specifications: Torque values, clearances, tolerances, fluid capacities, electrical resistance values Wiring Diagrams: Comprehensive electrical schematics for all systems Technical Depth Depth Of Information: Factory-level detail, suitable for professional mechanics and advanced DIY enthusiasts Diagrams And Illustrations: Highly detailed exploded views and step-by-step diagrams 📊 Manual Specifications File Format Format: PDF Compatibility: PC & MAC compatible Searchability: Searchable text content Print Quality Printability: Printable pages for convenient workshop use Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Family: BMW M10 (4-cylinder), M20 (6-cylinder for later models) Common Variants Engine Codes And Displacements: M10: M10B18 (1.8L), M10B20 (2.0L), M10B23 (2.3L); M20: M20B20 (2.0L), M20B23 (2.3L), M20B25 (2.5L - later years, e.g., 323i, 325i) Performance Typical Horsepower Range: 75 hp to 150 hp (depending on engine and tuning) Typical Torque Range: 90 lb-ft to 170 lb-ft (depending on engine and tuning) Fuel System Carburetion: Single or twin Zenith/Solex/Pierburg carburetors (common on 4-cylinder models) Fuel Injection: Bosch L-Jetronic (introduced on later models, notably 320i, 323i) Engine Construction Block Material: Cast Iron Cylinder Head Material: Aluminum Alloy 🔧 Transmission Standard Transmission Type: 4-speed or 5-speed manual Optional Transmission Type: 3-speed or 4-speed automatic (ZF) Features Clutch Type: Dry single-plate diaphragm spring Final Drive: Open differential 📐 Dimensions Exterior Wheelbase: Approx. 100.8 inches (2560 mm) Length: Approx. 170.1 inches (4320 mm) Width: Approx. 64.6 inches (1640 mm) Height: Approx. 54.5 inches (1385 mm) Weights Curb Weight: Approx. 2500 - 2900 lbs (1135 - 1315 kg) 🛡️ Safety Features Ratings Crash Test Era: Pre-dates modern standardized crash testing (e.g., NHTSA 5-star ratings). Active Features Braking System: Front disc brakes, rear drum brakes (later models offered rear discs). Suspension Handling: Well-balanced chassis and...