🏷️ Basic Information Identification Make: BMW Model: 3 Series Model Code: E21 Production Years Covered By Manual: 1975-1983 👋 Introduction Market Position Segment Positioning: The BMW E21 3 Series established BMW's reputation in the compact executive sports sedan market, offering a blend of performance, luxury, and sporty handling. Competitive Analysis Key Competitors: Competed with cars like the Mercedes-Benz W201 (190E), Audi 80/Fox, Ford Capri, and certain American compacts of the era, but distinguished itself with its driving dynamics. Key Features Unique Selling Points: The E21 was renowned for its refined inline-four and inline-six engines, independent front suspension with MacPherson struts, semi-trailing arm rear suspension, and classic BMW styling. Manual Value Proposition Cost Savings: Enables owners to perform DIY repairs and maintenance, significantly reducing labor costs associated with dealerships and independent specialists. Ease Of Use: Designed with step-by-step instructions and illustrative diagrams to make complex procedures accessible to enthusiasts of varying skill levels. 📋 Manual Details Coverage Areas Overall Coverage: Complete Workshop Service Repair Procedure Scope: Every service and repair procedure A-Z Model Variant Coverage: All Models, Engines, Trim, and Transmission Types Page Count Estimated Page Count: Varies by specific sub-model and engine, typically 500+ pages for a complete factory-style manual Manual Type Type: Workshop Service Repair Manual Language Language: English Format Digital Format: Downloadable PDF Digital Readability: Viewable on PC, MAC, tablets, smartphones Printing Capability: Printable (single page, chapter, or entire manual) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine overhaul, cylinder head, block, crankshaft, pistons, connecting rods, timing systems Engine Fuel System: Fuel injection systems (Bosch L-Jetronic), carburetors (Solex, Zenith), fuel pump, lines, filters Engine Ignition System: Distributor, ignition coil, spark plugs, timing settings Engine Cooling System: Radiator, water pump, thermostat, hoses, fan Engine Exhaust System: Exhaust manifold, pipes, muffler, catalytic converter (later models) Transmission Manual: Clutch, gearbox overhaul, gear shift linkage, bearings, seals Transmission Automatic: Automatic transmission overhaul, fluid, torque converter, control systems (if applicable to models covered) Drivetrain Rear Axle: Differential, driveshafts, universal joints, rear axle assembly Suspension Front: MacPherson struts, control arms, ball joints, anti-roll bar, steering knuckle Suspension Rear: Semi-trailing arms, shock absorbers, coil springs, bushings Braking System: Front discs, rear drums (or discs depending on model variant), brake calipers, master cylinder, brake lines, parking brake Steering System: Steering rack, tie rod ends, steering column, steering wheel Electrical System Charging: Alternator, voltage regulator, battery, wiring Electrical System Starting: Starter motor, solenoid, ignition switch Electrical System Lighting: Headlights, taillights, interior lighting, bulbs Electrical System Instruments Gauges: Speedometer, tachometer, fuel gauge, temperature gauge, warning lights Body Interior: Seats, dashboard, door panels, carpets, trim, headliner Body Exterior: Body panels, doors, hood, trunk, bumpers, glass, seals, locks HVAC System: Heating, ventilation, (air conditioning if optioned) Procedures Included Preventive Maintenance: Oil changes, filter replacements, fluid checks, lubrication, tune-ups Troubleshooting: Diagnostic procedures for common and uncommon faults across all systems Repair Procedures: Step-by-step instructions for component replacement and repair Overhaul Rebuild: Complete engine, transmission, and differential rebuild procedures Electrical Diagnostics: Wiring diagrams, component testing, circuit diagnosis Specifications Data: Torque specifications, clearances, tolerances, fluid types and capacities Technical Depth Depth Level: Comprehensive: Covers everything from basic maintenance to complete engine and transmission rebuilds 📊 Manual Specifications File Format Required Software: Adobe Reader (free download) Print Quality Image Resolution: High quality, clear diagrams and photographs Binding Type Digital Binding: N/A (digital download, printable) - Original manuals would be spiral-bound or case-bound Paper Type Digital Paper: N/A (digital download, printable) - Original manuals would be printed on durable paper stock ⚙️ Engine Specifications Primary Engine Engine Family: M10 (4-cylinder), M20 (6-cylinder) Performance Common Engines: 315 (1.6L), 316 (1.8L), 318 (1.8L, 2.0L), 320 (2.0L, 2.3L), 323i (2.3L inline-6) Power Output Range: Approx. 75 hp (315) to 143 hp (323i) Torque Output Range: Approx. 110 Nm to 185 Nm Fuel System Injection System: Bosch L-Jetronic fuel injection (most 4-cyl and all 6-cyl), Carburetor (early 4-cyl models) Fuel Type: Unleaded gasoline (premium recommended) 🔧 Transmission Standard Transmission Type: 4-speed manual gearbox standard on base models, 5-speed manual optional/standard on higher trims Optional Transmission Type: 3-speed automatic transmission (ZF 3HP18/3HP22) available as an option Features Clutch Type: Hydraulically actuated single dry plate clutch 📐 Dimensions Exterior Body Styles: 2-door sedan, 4-door sedan Wheelbase: Approx. 2570 mm (101.2 inches) Length: Approx. 4360 mm (171.7 inches) Width: Approx. 1610 mm (63.4 inches) Height: Approx. 1380 mm (54.3 inches) Weights Curb Weight Range: Approx. 1150 kg - 1300 kg (2535 lbs - 2866 lbs) depending on engine and trim 🛡️ Safety Features Ratings Crash Safety Era: Designed to meet safety standards of its time; lacked modern active/passive safety features like airbags and ABS as standard. Active Features Braking System Features: Front disc brakes, rear drum brakes. Power assistance typically standard. Passive Features Occupant Protection: Reinforced passenger cell, safety-design steering column, padded dashboard, 3-point seatbelts (front), 2-point seatbelts (rear, typically) 💡 Technology...