🏷️ Basic Information Identification Make: BMW Model: 520i Year: 1990 Codes Chassis Code: E34 Engine Code Group: M50 👋 Introduction Market Position Segment: Executive Sedan Positioning: The BMW 5 Series (E34) represented BMW's commitment to sporty luxury, blending driving dynamics with comfort and refinement. The 520i was a key entry-level model in this premium segment. Competitive Analysis Competitors: Mercedes-Benz W124 E-Class (e.g., E200), Audi 100/A6 (C3/C4), Lexus ES250. Key Features Handling: Renowned for its balanced chassis, independent suspension, and rear-wheel-drive dynamics, offering a superior driving experience. Build Quality: Typical BMW build quality for the era, with a focus on durability and premium materials. Engine Smoothness: The M50 inline-six engine provided smooth power delivery and refined operation. Design: Classic E34 styling by Ercole Spada, characterized by clean lines, a purposeful stance, and BMW's signature kidney grille. 📋 Manual Details Coverage Areas Primary Coverage: BMW 520i (E34) 1990 Model Year Engine Coverage: 2.0L M50B20 Inline-6 Transmission Coverage: 4-Speed Automatic (A4S 310R) and 5-Speed Manual (Getrag 260/5) Page Count Estimated Page Count: 700+ Manual Type Type: Full Service & Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder head, crankshaft, pistons, connecting rods, camshafts, timing, lubrication system, cooling system, fuel delivery system. Engine Management: Bosch Motronic M3.1/M3.3 engine management system, fuel injection, ignition system, sensors (MAF, O2, Crankshaft Position, Camshaft Position, Throttle Position), actuators. Transmission Manual: Clutch, gearbox components, shift mechanism, driveshafts, U-joints, differential (for manual variants). Transmission Automatic: Transmission fluid, torque converter, valve body, planetary gears, solenoids, electronic control unit (ECU) interface for automatic transmission. Suspension: Front struts, control arms, ball joints, tie rods, rear multi-link suspension, shock absorbers, springs, bushings. Steering: Power steering system, steering rack, pump, hoses, steering column, wheel alignment procedures. Brakes: Front and rear disc brakes, ABS (Anti-lock Braking System) components, brake lines, master cylinder, brake fluid, bleeding procedures, parking brake. Electrical System: Battery, alternator, starter motor, wiring diagrams, fuses, relays, lighting system (headlights, taillights, interior), horn, wipers, washer system. Body And Chassis: Body panel removal/installation, doors, hood, trunk, bumpers, interior trim, glass replacement, rust repair techniques. HVAC: Heating, ventilation, air conditioning (HVAC) system, compressor, refrigerant, blower motor, climate control panel, heater core, evaporator core. Procedures Included Maintenance: Oil and filter changes, spark plug replacement, air filter replacement, fuel filter replacement, coolant flush and refill, brake fluid flush, transmission fluid changes, differential fluid changes. Diagnostics: Troubleshooting guides for common issues, diagnostic trouble codes (DTCs) for engine management system, electrical system diagnostics, component testing procedures. Repair: Complete engine overhaul, cylinder head gasket replacement, piston ring replacement, valve adjustments, timing belt/chain replacement (if applicable), transmission rebuilds, brake caliper replacement, steering rack replacement, electrical component repair. Rebuilding: Detailed instructions for rebuilding major components like the engine, transmission, and differential. Refurbishment: Guidance on restoring worn or damaged parts, cosmetic repairs, and potential upgrades. Restoration: Comprehensive information for complete vehicle restoration projects, including historical context and correct procedures. Technical Depth Depth: Comprehensive: Covers everything from routine maintenance to complete engine and transmission overhauls, including in-depth diagnostic procedures and wiring diagrams. 📊 Manual Specifications File Format Searchability: Searchable text content within the PDF for quick information retrieval. Printability: Printable pages for in-workshop use. Print Quality Image Resolution: High-resolution diagrams, schematics, and photographs for clarity. Binding Type Binding: N/A (Digital PDF) Paper Type Paper Quality: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated Inline-6 (M50B20) Displacement: 1991 cc (2.0 Liters) Bore X Stroke: 80.0 mm x 66.0 mm Compression Ratio: 8.8:1 Valve Train: DOHC, 4 valves per cylinder Performance Horsepower Net: 129 hp (95 kW) @ 5500 rpm Torque Net: 180 Nm (133 lb-ft) @ 4300 rpm Fuel System Fuel Delivery: Bosch Motronic M3.1/M3.3 Sequential Multi-Port Fuel Injection (MPI) Fuel Type: Unleaded Gasoline (91-95 RON recommended) Ignition System: Electronic Ignition with Knock Control 🔧 Transmission Standard Type: 5-Speed Manual (Getrag 260/5) Optional Type: 4-Speed Automatic (A4S 310R) Features Clutch: Hydraulically actuated single dry plate clutch (for manual). Gear Ratios Manual: 1st: 4.23:1, 2nd: 2.52:1, 3rd: 1.68:1, 4th: 1.24:1, 5th: 1.00:1, Reverse: 3.71:1 (Typical for Getrag 260/5) Gear Ratios Automatic: 1st: 2.48:1, 2nd: 1.48:1, 3rd: 1.00:1, 4th: 0.71:1, Reverse: 2.08:1 (Typical for A4S 310R) Transmission Fluid Manual: MTF-LT-2 or equivalent (e.g., GL-4 SAE 75W-90) Transmission Fluid Automatic: BMW ATF ETL-7045E or equivalent (e.g., Dexron III H) 📐 Dimensions Exterior Length: 4730 mm (186.2 in) Width: 1751 mm (68.9 in) Height: 1410 mm (55.5 in) Wheelbase: 2760 mm (108.7 in) Front Track: 1462 mm (57.6 in) Rear Track: 1486 mm (58.5 in) Weights Curb Weight Manual: ~1500 kg (3307 lbs) Curb Weight Automatic: ~1530 kg (3373 lbs) Gross Vehicle Weight: ~2000 kg (4409 lbs) (Estimated) Cargo Trunk Capacity: 450 liters (15.9 cu ft) (Approximate) 🛡️ Safety Features Ratings Crash Test Ratings: NHTSA/IIHS ratings not available for this specific model year and market. Refer...