🏷️ Basic Information Identification Make: BMW Model: 5-Series Chassis Code: E34 Model Variant: 525i Model Years Covered: 1988, 1989, 1990, 1991 Codes Engine Code Relevant: M50B25 👋 Introduction Market Position Positioning E34: The E34 generation represented BMW's fifth generation of the 5-Series executive sedan, known for its blend of luxury, performance, and engineering refinement. The 525i was a popular mid-range model, offering a balance of power and efficiency powered by BMW's acclaimed inline-six engines. Competitive Analysis Competitors Era: Competed against luxury sedans such as the Mercedes-Benz W124 E-Class, Audi V8 Quattro, Lexus LS 400, and Jaguar XJ. Key Features Vehicle Design Philosophy: Iconic BMW ' Hofmeister kink' design, aerodynamic styling, driver-focused cockpit. Driving Dynamics: Renowned for balanced handling, rear-wheel drive chassis, and a refined ride quality. Key Features Manual Manual Value Proposition: Provides the authoritative information required for accurate diagnosis, repair, and maintenance, ensuring the longevity and optimal performance of the E34 525i. 📋 Manual Details Coverage Areas Manual Type: Official Factory Service Repair Manual Language: English Format: Digital (printable) Content Depth: Comprehensive Target Audience: Professional Technicians and Experienced DIY Enthusiasts 📖 Manual Coverage Systems Covered Engine: Complete service, repair, and overhaul for the M50B25 inline-6 engine Fuel System: Fuel injection (Bosch Motronic), fuel pump, injectors, lines, tank, pressure regulation Ignition System: Electronic ignition control, coil packs, spark plugs, sensors Cooling System: Radiator, water pump, thermostat, hoses, fan clutch, coolant specifications Exhaust System: Exhaust manifold, catalytic converter, mufflers, pipework, emissions control Transmission Manual: Service and repair for Getrag 260 5-speed manual gearbox, clutch assembly, driveline Transmission Automatic: Service and repair for ZF 4HP22 EH 4-speed automatic transmission, torque converter, valve body, control systems Suspension: Front McPherson struts, rear multi-link suspension, springs, dampers, bushings, alignment specifications Steering: Power steering system, steering rack, pump, fluid specifications, steering column Brakes: Front ventilated discs, rear solid discs, ABS (Anti-lock Braking System) operation, hydraulic system, bleeding procedures Electrical System: Wiring diagrams, fuse box locations, starter, alternator, battery, lighting systems Climate Control: HVAC system, A/C compressor, refrigerant, heater core, blower motor, controls Body And Chassis: Body panel removal/installation, door mechanisms, glass, seals, chassis structure, corrosion protection Interior: Seat removal/installation, dashboard components, trim panels, sound insulation Procedures Included Maintenance: Oil changes, filter replacements, spark plug replacement, fluid checks and top-offs, belt inspections Troubleshooting: Diagnostic flowcharts for common symptoms (e.g., starting issues, poor performance, warning lights) Repair: Detailed step-by-step repair procedures for all major systems, including component removal, overhaul, and reassembly Diagnostics: Fault code retrieval (where applicable for the era), sensor testing, component testing procedures Rebuilds: Engine, transmission, differential, and major component rebuild procedures with specifications Specifications: Torque values, clearances, tolerances, fluid capacities, and diagnostic parameters Technical Depth Depth: Full factory level detail, covering everything from routine maintenance to complete engine rebuilds and complex diagnostics 📊 Manual Specifications File Format Digital Format: PDF Searchability: Text-searchable for quick information retrieval Print Quality Print Readability: High-resolution for clear text and diagrams Print Scalability: Printable on demand, allowing users to print specific sections or the entire manual Binding Type Physical Binding: N/A (Digital Product) Paper Type Physical Paper Type: N/A (Digital Product) Completeness Manual Completeness: Complete official factory service manual ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, naturally aspirated Engine Code: M50B25 Displacement: 2494 cc (2.5 Liters) Bore X Stroke: 84.0 mm x 75.0 mm Compression Ratio: 8.8:1 (Euro spec), 10.0:1 (US spec) Performance Horsepower Hp: 170 hp @ 5500 rpm (Euro spec), 189 hp @ 6000 rpm (US spec for M50) Torque Lb Ft: 170 lb-ft @ 4300 rpm (Euro spec), 181 lb-ft @ 4700 rpm (US spec for M50) Fuel System Fuel Delivery: Bosch Motronic Electronic Fuel Injection (EFI) Fuel Type: Unleaded Gasoline (Premium Unleaded Recommended) Fuel Pump Type: In-tank electric Engine Management ECU Type: Bosch Motronic M2.7 / M3.3 Cooling System Coolant Capacity: Approximately 8.5 liters (17.9 pints) Lubrication System Oil Capacity: Approximately 6.5 liters (6.9 US Quarts) with filter change 🔧 Transmission Standard Type: Getrag 260 5-speed Manual Transmission Optional Type: ZF 4HP22 EH 4-speed Automatic Transmission Features Manual Gear Ratios: Typical ratios: 1st: 4.23:1, 2nd: 2.52:1, 3rd: 1.66:1, 4th: 1.22:1, 5th: 1.00:1, Reverse: 3.71:1 Automatic Transmission Control: Electronic Hydraulic control with Comfort/Sport modes on later E34 models Fluid Specification Manual Transmission Fluid Type: BMW MTF LT-2 or equivalent API GL-4 SAE 75W-90 gear oil Fluid Specification Automatic Transmission Fluid Type: BMW LT 71141 or equivalent Dexron III/Mercon ATF 📐 Dimensions Exterior Length: Approx. 4720 mm (185.8 inches) Width: Approx. 1751 mm (68.9 inches) Height: Approx. 1410 mm (55.5 inches) Wheelbase: Approx. 2763 mm (108.8 inches) Weights Curb Weight Manual: Approx. 1500-1550 kg (3307-3417 lbs) Curb Weight Automatic: Approx. 1550-1600 kg (3417-3527 lbs) Gross Vehicle Weight Rating: Varies by configuration, typically around 2000-2050 kg Cargo Trunk Volume: Approx. 500 liters (17.7 cubic feet) 🛡️ Safety Features Ratings Crash Test Era: Safety standards and testing methodologies...