🏷️ Basic Information Identification Make: BMW Model: 5 Series Model Variant: 520 / 520i Chassis Code: E34 Codes Engine Code: M50B20 (likely for 520i) 👋 Introduction Market Position Market Segment: Executive/Luxury Sedan Target Audience: BMW owners, independent repair shops, automotive technicians specializing in BMW vehicles. Competitive Analysis Competitors: Mercedes-Benz W124 E-Class, Audi 100/200, Volvo 740/940. Key Features Design Philosophy: Focus on driving dynamics, build quality, and sophisticated engineering. Target Market Region: Primarily European market for 520/520i variants, but manual covers broader E34 platform. 📋 Manual Details Coverage Areas Covered Years: 1988, 1989, 1990, 1991 Covered Models: BMW 520, BMW 520i Page Count Page Count: 227 Manual Type Manual Type: Workshop Service Repair Manual Language Language: English (assumed based on typical manual publishing for this market) Format Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine overhaul, cylinder head, pistons, crankshaft, camshafts, timing system, lubrication, cooling system, fuel injection (specific to 520i). Engine Management: Engine Control Unit (ECU) diagnosis, sensor testing and replacement, ignition system, fuel delivery and control for M50B20 engine. Transmission: Manual and automatic transmission overhaul, clutch operation, driveline, driveshafts, differentials. Suspension: Front and rear suspension components, shock absorbers, springs, control arms, anti-roll bars, steering system, power steering. Brakes: Hydraulic system, ABS (if equipped), brake calipers, rotors, pads, lines, master cylinder, brake fluid specifications. Electrical System: Wiring diagrams, battery, charging system (alternator), starting system, lighting, fuses, relays, horn, wipers, power windows, mirrors. Bodywork: Body panel removal and installation, doors, hood, trunk, bumpers, glass, interior trim, body repair specifications. HVAC: Heating, ventilation, and air conditioning system diagnosis and repair, refrigerant handling. Fuel System: Fuel tank, fuel pump, fuel lines, injectors, fuel pressure regulator. Procedures Included Maintenance: Routine maintenance schedules, oil changes, filter replacements, spark plug replacement, fluid checks and top-ups. Troubleshooting: Diagnostic procedures for common problems, fault finding based on symptoms, specific diagnostic codes (if applicable). Repair: Step-by-step repair instructions for all major systems, component replacement, adjustments, and calibrations. Assembly Disassembly: Detailed instructions for removing and reassembling various vehicle components and systems. Technical Depth Depth: Comprehensive, suitable for professional technicians and advanced DIY enthusiasts. Covers diagnostics, repair, and overhaul. Diagnostics: Detailed diagnostic flowcharts and procedures, including electrical system diagnostics. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High-resolution, suitable for printing (assuming original source quality). Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, naturally aspirated petrol Engine Code Common: M20B20 (for earlier 520 models) or M50B20 (for 520i, likely from 1990 onwards) Displacement: 2.0 Liters (1990 cc) Performance Horsepower M50B20: Approx. 150 PS (148 hp) @ 6000 rpm Torque M50B20: Approx. 190 Nm (140 lb-ft) @ 4300 rpm Fuel System Fuel Delivery: Bosch Motronic fuel injection (specific version dependent on year/engine) Fuel Type: Unleaded Petrol (RON 91 or higher) Engine Mechanical Valvetrain: DOHC, 4 valves per cylinder 🔧 Transmission Standard Type: 5-speed Manual Optional Type: 4-speed Automatic (e.g., ZF 4HP22) Features Driveline: Rear-wheel drive (RWD) 📐 Dimensions Exterior Length: Approx. 4720 mm (185.8 in) Width: Approx. 1751 mm (68.9 in) Height: Approx. 1410 mm (55.5 in) Weights Curb Weight Approx: 1450-1550 kg (depending on transmission and equipment) Gross Vehicle Weight Rating Approx: 1900-2000 kg 🛡️ Safety Features Ratings Crash Test History: E34 platform generally well-regarded for its era, though formal ratings from independent agencies like NHTSA/IIHS may be limited for this specific generation and model variant. Active Features ABS: Available, often standard on later models or optional. Passive Features Airbags: Driver airbag standard from 1990/1991, passenger airbag optional/later addition. Seatbelts: Three-point front and rear seatbelts. 💡 Technology Features Infotainment Audio System: Optional BMW Bavaria C or RDS radios with cassette players. Speaker upgrades and aftermarket head unit integration are common. Driver Assistance Traction Control: Optional ASC (Automatic Stability Control) or ASC+T (with traction control) became available on later E34 models. Features Climate Control: Optional automatic climate control (Climatronic) available on higher trims or as an option. Lighting: Optional Xenon headlamps were introduced late in the E34 lifecycle, but standard on earlier models are H4 halogen units. Power-adjustable headlights with integrated washers. 🔧 Maintenance Service Intervals Oil Change: Typically every 10,000-15,000 km or 12 months, depending on driving conditions and oil used. Check manual for specific recommendation. Spark Plugs: Intervals vary by plug type (copper, platinum, iridium). Typically 20,000-40,000 km for older copper plugs, potentially longer for precious metal types. Coolant Change: Every 2-3 years or 40,000-60,000 km. Brake Fluid Change: Every 2 years. Fluid Specifications Engine Oil: API SG/SH or higher. Viscosity grades such as 5W-30, 5W-40, 10W-40, or 15W-40 depending on climate. Refer to manual for precise BMW approvals (e.g., BMW Special Oil). Coolant: BMW Blue Antifreeze/Coolant (G48) or equivalent ethylene glycol-based coolant, mixed 50/50 with distilled water. Transmission Fluid Manual: API GL-4 or GL-5 gear oil, e.g.,...