🏷️ Basic Information Identification Make: BMW Model: 3 Series Model Variant: 323i Generation Generation Code: E21 Codes Chassis Code: E21 👋 Introduction Market Position Segment: Compact Executive Sports Sedan Target Audience: Enthusiasts seeking to maintain and repair their classic BMW 3 Series. Competitive Analysis Competitors: Mercedes-Benz W123 series, Audi 80/90, Alfa Romeo Alfetta. Key Features Vehicle Philosophy: Sporty handling, driver-focused interior, reliable performance. Manual Value Proposition Benefit: Empowers owners and mechanics with comprehensive, accurate information for DIY repairs and professional servicing. Delivery: Instant download eliminates shipping costs and delays, providing immediate access to critical repair data. 📋 Manual Details Coverage Areas Years Covered: 1975-1984 Page Count Total Pages: 910 Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul procedures, cylinder head, block, crankshaft, camshaft, pistons, connecting rods, timing system, oil pump. Fuel System: Fuel injection (Bosch L-Jetronic), fuel pump, fuel filter, fuel lines, injectors, fuel pressure regulator. Ignition System: Spark plugs, ignition coils, distributor, ignition timing, electronic ignition control. Cooling System: Radiator, thermostat, water pump, coolant hoses, fan, temperature sensor. Exhaust System: Exhaust manifolds, catalytic converter (if applicable for later models), muffler, pipes, hangers. Transmission Manual: Clutch operation, gearbox overhaul, gear selection linkage, driveshafts. Transmission Automatic: Torque converter, hydraulic control, planetary gearsets, valve body, transmission fluid and filter changes. Drivetrain: Differential, rear axle, wheel bearings. Suspension Front: MacPherson struts, control arms, ball joints, steering knuckles, springs, shock absorbers. Suspension Rear: Trailing arms, coil springs, shock absorbers, anti-roll bar. Steering System: Steering rack, tie rods, steering column, power steering pump (if equipped). Brakes Front: Ventilated disc brakes, calipers, brake pads, brake lines, master cylinder. Brakes Rear: Disc brakes, calipers, brake pads, brake lines, parking brake mechanism. Electrical System: Battery, alternator, starter motor, wiring diagrams, fuses, relays, lighting system, dashboard instruments. Body And Chassis: Body panel removal and installation, structural components, doors, windows, locks, interior trim. HVAC System: Heating system, ventilation, blower motor, heater core, control cables. Procedures Included Preventive Maintenance: Oil changes, filter replacements, tune-ups, fluid checks and top-offs, belt inspections. Troubleshooting: Diagnostic charts for common problems, symptom-based troubleshooting guides. Component Repair Overhaul: Detailed step-by-step instructions for rebuilding or replacing major components. Diagnostic Procedures: Engine timing adjustments, fuel system pressure testing, electrical system continuity checks. Wiring Diagrams: Comprehensive electrical schematics for various systems. Technical Depth Depth: Comprehensive coverage from basic maintenance to full engine and transmission rebuilds, including detailed diagnostics. 📊 Manual Specifications File Format File Type: PDF Searchable: Yes (text-searchable for quick information retrieval). Print Quality Quality: High-resolution scans of original factory documentation, ensuring clarity of text and diagrams. Binding Type Binding: N/A (Digital PDF format) Paper Type Paper: N/A (Digital PDF format) ⚙️ Engine Specifications Primary Engine Engine Code: M20B23 Engine Type: Inline 6-cylinder, SOHC Displacement: 2.3 Liters (2315 cc) Performance Horsepower: 143 hp @ 5700 rpm (approx.) Torque: 195 Nm @ 4500 rpm (approx.) Fuel System Injection System: Bosch L-Jetronic Fuel Type: Unleaded Gasoline (Premium) Technical Details Bore X Stroke: 80.0 mm x 76.8 mm Compression Ratio: 8.8:1 🔧 Transmission Standard Type: 4-speed Manual Optional Type: 3-speed Automatic (ZF 3HP22) Features Manual Clutch: Hydraulically operated single dry plate clutch. Automatic Cooling: Transmission fluid cooler integrated with the radiator. 📐 Dimensions Exterior Length: 4360 mm (171.7 in) Width: 1610 mm (63.4 in) Height: 1380 mm (54.3 in) Wheelbase: 2570 mm (101.2 in) Weights Curb Weight: 1200 - 1300 kg (approx., depending on transmission and equipment) Gross Vehicle Weight: 1700 kg (approx.) 🛡️ Safety Features Ratings Crash Test Era: Pre-dates modern mandatory crash testing, focused on passive safety features of its era. Active Features Brakes: Front ventilated discs, rear discs. ABS was not standard, but some later models may have offered it as an option. Steering: Recirculating ball steering (non-power assisted standard, optional power steering). Passive Features Seatbelts: Three-point inertia reel seatbelts at the front, lap belts at the rear. Body Structure: Reinforced passenger safety cell, energy-absorbing steering column. 💡 Technology Features Infotainment Audio System: Factory fitted AM/FM radio with cassette player, often with aftermarket upgrades. Climate Control: Manual ventilation and heating system with adjustable air flow and temperature. Driver Assistance ABS: Optional on some later models, not standard. Cruise Control: Optional on some higher-spec models. Connectivity N/A: No modern connectivity features such as Bluetooth or USB ports in original specification. 🔧 Maintenance Service Intervals Oil Change: Every 5,000 - 7,500 miles or 6-12 months, whichever comes first (depending on driving conditions). Spark Plugs: Inspect every 15,000 miles, replace as needed (recommend Bosch W7DC or equivalent). Timing Belt Chain: M20 engines use a timing chain, designed for the life of the engine; inspect tensioner and guides periodically. Coolant Flush: Every 2 years or 30,000 miles. Fluid Specifications Engine Oil: API SG or higher, SAE 15W-40 or 20W-50 (check owner's manual for specific viscosity recommendations based on climate)....