🏷️ Basic Information Identification Make: BMW Model: 3 Series (E21) Variant: 320i, 323i Generation Code: E21 Production Years Covered: 1975-1983 👋 Introduction Market Position Target Audience: BMW E21 owners, DIY enthusiasts, independent repair shops, classic car restorers Value Proposition: Empowers owners to perform their own maintenance and repairs, saving significant costs associated with dealership or specialized shop labor. Provides in-depth knowledge for proper vehicle care and restoration. Competitive Analysis Unique Selling Points: Covers a wide range of years and models within the E21 generation, offering complete A-Z repair coverage. High-quality, detailed instructions with visual aids. Key Features Benefit Focus: Ease of use, cost savings, comprehensive repair guidance, longevity of vehicle ownership. 📋 Manual Details Coverage Manual Type: Complete Workshop Service Repair Manual Coverage Areas: All Models, Engines, Trim, Transmission Types (320i, 323i) Format Language: English Format Type: Downloadable Digital File (PDF compatible) File Availability: Instant Email Delivery Print Capability: Printable (individual pages, chapters, or entire manual) Device Compatibility: All PC & MAC Computers, Tablets, Mobile Phones Software Requirement: Adobe Reader (or compatible PDF viewer) 📖 Manual Coverage Systems Systems Covered: Engine, Transmission, Drivetrain, Fuel System, Cooling System, Electrical System, Ignition System, Exhaust System, Suspension, Steering, Brakes, Bodywork, Chassis, HVAC, Interior Components, Exterior Trim Procedures Procedures Included: Routine Maintenance, Scheduled Servicing, Inspections, Diagnostics, Troubleshooting, Component Removal and Installation, Overhaul Procedures, Repair Work, Adjustments, Lubrication, Wiring Diagrams, Torque Specifications Depth Technical Depth: Comprehensive: From basic fluid changes to complete engine and transmission rebuilds, including detailed electrical troubleshooting and body repair procedures. 📊 Manual Specifications Digital File Format: PDF Searchability: Likely searchable text content if sourced from official documentation. Resolution: High quality, suitable for clear viewing and printing. ⚙️ Engine Specifications 320I Engine Code Primary: M10 Engine Type Primary: Inline 4-cylinder, naturally aspirated Displacement Primary: 1990 cc (2.0 Liters) Bore X Stroke Primary: 89.0 mm x 79.0 mm Compression Ratio Primary: 8.3:1 (typical, can vary by market/year) Horsepower Primary: 101-110 hp @ 5800 rpm (varies by year and fuel injection/carburetor) Torque Primary: 160-170 Nm @ 3000-3500 rpm (varies by year and fuel injection/carburetor) Fuel System Primary: Bosch L-Jetronic Fuel Injection (later years) or Solex Zenith Carburetor (earlier years) Ignition System Primary: Distributor-based electronic ignition 323I Engine Code Primary: M20 Engine Type Primary: Inline 6-cylinder, naturally aspirated Displacement Primary: 2316 cc (2.3 Liters) Bore X Stroke Primary: 80.0 mm x 76.8 mm Compression Ratio Primary: 8.8:1 Horsepower Primary: 143 hp @ 5300 rpm Torque Primary: 205 Nm @ 4000 rpm Fuel System Primary: Bosch K-Jetronic Fuel Injection Ignition System Primary: Distributor-based electronic ignition 🔧 Transmission Standard Type Standard: 4-speed Manual (Getrag 245) Optional Type Optional: 3-speed ZF 3HP22 Automatic Features Clutch Type: Single dry plate, hydraulically operated Final Drive Ratio: Varies by engine and transmission; typically 3.64 for manual, 3.45 for automatic (E21 320i) 📐 Dimensions Exterior Wheelbase: 2563 mm (100.9 inches) Length: 4355 mm (171.5 inches) Width: 1612 mm (63.5 inches) Height: 1380 mm (54.3 inches) Weights Curb Weight: Approx. 1150-1300 kg (2535-2866 lbs), depending on model and options Wheels Tires Wheel Bolt Pattern: 4x100 Standard Wheel Size: 13 inch or 14 inch (steel or alloy) Standard Tire Size: e.g., 175/70R13, 185/70R13, 175/70R14, 185/70R14 🛡️ Safety Features Features Active Safety Features: Front disc brakes, rear drum brakes; Independent front suspension (MacPherson struts); Independent rear suspension (Semi-trailing arms) Passive Safety Features: Reinforced safety cell, padded dashboard, collapsible steering column, front and rear crumple zones. Ratings Crash Test Data: While formal crash test data from modern agencies is limited for this era, the E21 was designed with significant safety advancements for its time, including structural integrity improvements over its predecessor (the 02 Series). 💡 Technology Features Infotainment Original System: Basic AM/FM radio, optional cassette player. Speakers typically located in doors and rear parcel shelf. Features Instrument Cluster: Analog gauges for speedometer, tachometer, fuel level, coolant temperature. Warning lights for oil pressure, charging system, brake failure, etc. Other Features: Optional electric windows, sunroof, air conditioning (rare), limited-slip differential (on some 323i models). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, depending on driving conditions and oil type. Spark Plug Replacement: Every 15,000-30,000 miles (24,000-48,000 km), depending on plug type. Timing Belt Replacement: The M10 and M20 engines use a timing chain, not a belt. The chain requires inspection for stretch and tensioner wear periodically, but typically has a very long service life, often lasting the life of the engine if oil changes are regular. Fluid Specifications Engine Oil Type: API SF/SG, SAE 15W-40 or 20W-50 recommended (consult manual for exact specifications). Engine Oil Capacity: Approx. 4.5-5.0 liters (4.7-5.3 US quarts) for 4-cylinder; Approx. 5.0-5.5 liters (5.3-5.8 US quarts) for 6-cylinder. Coolant Type: Ethylene glycol-based antifreeze (BMW coolant or equivalent). Brake Fluid Type: DOT 3 or DOT 4 Transmission Fluid Manual: GL-4 Gear Oil (e.g., SAE 75W-90 or 80W-90) Transmission...