🏷️ Basic Information Identification Make: BMW Model: 3 Series Generation Chassis Code: E21 Codes Platform: Rear-wheel drive 👋 Introduction Market Position Target Audience: BMW E21 owners, independent repair shops, automotive enthusiasts Competitive Analysis Value Proposition: Provides official factory data, enabling accurate and cost-effective repairs, bypassing dealership dependency. Key Features Uniqueness: Official factory content ensures accuracy and completeness unmatched by generic aftermarket guides. Access Method: Instant digital download for immediate access and ability to print specific sections. 📋 Manual Details Coverage Areas Manual Scope: Comprehensive service, repair, and troubleshooting Page Count Estimated Pages: 500+ Manual Type Type: Workshop Service Repair Manual (Official Factory) Language Language: English Format Format: Digital (Downloadable PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine (M10, M20), Ignition System, Cooling System, Fuel System, Transmission (4-speed manual, 5-speed manual, automatic), Drivetrain, Differential, Driveshaft Chassis Suspension: Front Suspension (MacPherson struts), Rear Suspension (Semi-trailing arms), Steering System (Recirculating ball), Brake System (Front discs, Rear drums/discs), Wheels & Tires, Body, Chassis Electrical Electronics: Body Electrical Systems, Electronic Control Modules (ECU - where applicable), Instrument Cluster, Lighting Systems (Headlamps, Taillamps, Interior), Power Systems (Alternator, Battery, Starter), Message Systems, Chime/Buzzer, Heated Systems (Rear defroster), Horn Comfort Convenience: Heating System, Ventilation, Air Conditioning (HVAC), Audio Systems Maintenance Lubrication: Detailed lubrication schedules, fluid specifications, maintenance procedures Procedures Included Diagnostic Troubleshooting: Troubleshooting charts, symptom-based diagnostics, electrical fault finding Repair Replacement: Step-by-step repair instructions for all major components and systems Maintenance Tasks: Scheduled maintenance, fluid changes, filter replacements, tune-ups Electrical Wiring: Detailed wiring diagrams for all circuits Technical Depth Depth: Intermediate to Advanced: Covers routine maintenance, component removal/installation, and in-depth diagnostic procedures. 📊 Manual Specifications File Format File Type: PDF Print Quality Searchability: Searchable text for quick information retrieval Image Resolution: High-resolution diagrams and illustrations Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) - Printable sections ⚙️ Engine Specifications Primary Engine Engine Families: M10 (4-cylinder), M20 (6-cylinder) Common Engine Variants: 315: M10B18 (1.8L), 316: M10B18 (1.8L), 318: M10B18 (1.8L), 320i: M20B20 (2.0L), 323i: M20B23 (2.3L) Performance Power Output Range: Approximately 90 HP to 145 HP (depending on engine and market) Torque Output Range: Approximately 130 Nm to 190 Nm (depending on engine) Fuel System Fuel Delivery: Carbureted (Zenith, Solex) for base models, Bosch L-Jetronic Fuel Injection for 'i' models Fuel Type: Unleaded gasoline (Premium unleaded recommended) Maintenance Spark Plug Type: Bosch W8AC or equivalent (refer to manual for specific engine) Engine Oil Capacity: Approximately 4.25 - 5.0 Liters (4.5 - 5.3 Quarts) (refer to manual for specific engine) Engine Oil Viscosity: SAE 20W-50 or 10W-40 (depending on climate and application, consult manual) 🔧 Transmission Standard Gearbox: 4-speed manual transmission Optional Gearbox: 5-speed manual transmission, 3-speed automatic transmission (ZF) Features Clutch Type: Single dry plate, hydraulically actuated Maintenance Manual Transmission Fluid: GL-4 Gear Oil (e.g., Castrol EPX 80W-90 or equivalent) Automatic Transmission Fluid: Dexron III or equivalent (consult manual for exact specification) 📐 Dimensions Exterior Body Styles: 2-door sedan, 4-door sedan Wheelbase: Approx. 2565 mm (100.98 inches) Weights Curb Weight Range: Approx. 1100 - 1250 kg (2425 - 2755 lbs) (depending on model and equipment) Gross Vehicle Weight Rating: Varies by model, consult manual 🛡️ Safety Features Ratings Crash Test Data: Limited official crash test data available for this era, but known for robust construction. Active Features Braking System: Front ventilated disc brakes, rear drum brakes (later models and higher trims may have rear discs) Parking Brake: Mechanical handbrake operating on rear wheels Passive Features Seatbelts: Standard 3-point front seatbelts, lap belts for rear passengers Steering Column: Collapsible steering column for improved impact protection 💡 Technology Features Infotainment Audio System: Optional factory radio, typically AM/FM with cassette player. Aftermarket options common. Driver Assistance ABS: Anti-lock Braking System (ABS) was not standard and was a rare option, typically found on later E21 models or specific performance variants. Cruise Control: Optional on some higher-trim models. Connectivity Connectivity Features: None (Era appropriate technology, no modern connectivity features) 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000 - 10,000 km (3,000 - 6,000 miles) or annually (consult manual for exact recommendation) Filter Replacement: Oil filter with every oil change, air filter and fuel filter periodically (e.g., 20,000 - 40,000 km) Timing Belt Chain: M10 engines use a timing chain (generally long-lasting), M20 engines use a timing belt (recommend replacement every 60,000 - 80,000 km or 4-5 years). Fluid Specifications Coolant Type: Ethylene glycol based coolant, typically a 50/50 mix with distilled water Brake Fluid Type: DOT 3 or DOT 4 brake fluid (consult manual for exact specification) Known Issues Common Problems: Rust (especially wheel arches, rocker panels, strut towers), fuel system leaks (especially with age), vacuum leaks, cooling system component deterioration (hoses, radiator), electrical gremlins (corroded connections), worn suspension bushings. Carburetor Tuning: Carburetors may require periodic adjustment and rebuild due to wear and gumming. 📚 Vehicle History...