🏷️ Basic Information Identification Make: BMW Model: 325i Model Variant: 325 Year: 1991 Codes Chassis Code: E30 Engine Code Common: M20B25 👋 Introduction Market Position Vehicle Class: Compact Executive Sedan/Coupe Target Audience: Enthusiasts, DIY mechanics, professional workshops Competitive Analysis Competitors 1991: Mercedes-Benz 190E, Audi 90, Lexus ES250, Acura Legend Key Features Vehicle Driving Dynamics: Renowned for its balanced chassis, rear-wheel-drive dynamics, and driver engagement Chassis Design: Monocoque chassis with front MacPherson struts and rear semi-trailing arms Key Features Manual Usefulness: Essential for owners and technicians seeking to maintain and repair the vehicle to factory specifications 📋 Manual Details Coverage Areas Manual Type: Service Repair Workshop Manual Language: English Format: Likely Digital (PDF) or Print Page Count Estimated Page Count: 500+ 📖 Manual Coverage Systems Covered Engine: Complete overhaul, diagnosis, and repair of M20B25 engine Fuel System: Bosch Motronic fuel injection system, fuel pump, injectors, fuel lines Ignition System: Ignition coil, distributor, spark plugs, ignition timing Cooling System: Radiator, water pump, thermostat, hoses, fan clutch Exhaust System: Exhaust manifolds, catalytic converter, mufflers, pipes Transmission Manual: Getrag 260, clutch assembly, gearbox overhaul, gear linkage Transmission Automatic: ZF 4HP22 EH, torque converter, hydraulic controls, valve body Drivetrain: Driveshafts, universal joints, differential, axle shafts Suspension: Front struts, rear trailing arms, shock absorbers, springs, bushings Steering: Steering rack, power steering pump, steering column, tie rods Brakes: Front ventilated discs, rear discs, ABS system, brake calipers, master cylinder Electrical System: Wiring diagrams, fuse box, relays, starter motor, alternator Lighting System: Headlights, taillights, interior lighting, wiring Body And Chassis: Body panel removal and installation, chassis alignment, corrosion repair Interior: Seat removal, dashboard components, trim panels HVAC: Air conditioning system, heater core, blower motor, controls Emissions Control: Catalytic converter, oxygen sensors, EGR system (where applicable), emissions testing procedures Procedures Included Maintenance: Oil changes, filter replacements, spark plug service, belt adjustments Troubleshooting: Diagnostic charts for common symptoms, fault codes (where applicable) Repair: Step-by-step instructions for component removal, repair, and reinstallation Overhaul: Complete engine and transmission rebuild procedures Adjustment: Valve clearance adjustment, timing belt tensioning, brake adjustments Wheel Alignment: Specifications and procedures for front and rear wheel alignment Torque Specifications: Detailed torque values for all critical fasteners Technical Depth Depth: Comprehensive, from basic maintenance to full engine/transmission rebuilds and electrical diagnostics Diagnostic Tools: Information on using basic diagnostic tools, multimeters, and specific BMW diagnostic aids (if any described) 📊 Manual Specifications File Format Digital Format Details: Searchable PDF with high-resolution diagrams and schematics Searchability: Text-searchable for quick information retrieval Print Quality Print Details: Professionally printed on durable paper stock with clear, crisp text and images Diagram Clarity: High-resolution, detailed exploded views and wiring diagrams Binding Type Binding: Staple-bound, perfect-bound, or comb-bound for ease of use Paper Type Paper Quality: Glossy or matte finish paper, resistant to shop grease and fluids ⚙️ Engine Specifications Primary Engine Engine Name: M20B25 Engine Type: Inline 6-cylinder, SOHC Displacement: 2494 cc (2.5 Liters) Performance Horsepower: 170 hp @ 5800 rpm Torque: 167 lb-ft @ 4750 rpm Fuel System Fuel Delivery: Bosch Motronic 1.3 Fuel Injection Fuel Type: Unleaded Premium (91 Octane minimum) Ignition System Ignition Type: Electronic Ignition Cooling System Coolant Type: BMW Antifreeze/Coolant (G48 or equivalent) Lubrication Oil Type: SAE 15W-50 or SAE 10W-40 (API SG or higher) 🔧 Transmission Standard Transmission Type: 5-Speed Manual (Getrag 260) Optional Transmission Type: 4-Speed Automatic (ZF 4HP22 EH) Features Manual Transmission Fluid: BMW Synchromesh Fluid (G52 or equivalent) Automatic Transmission Fluid: Dexron III/Mercon (or equivalent) 📐 Dimensions Exterior Length: 171.5 inches (4356 mm) Width: 67.3 inches (1709 mm) Height: 55.0 inches (1397 mm) Weights Curb Weight: Approx. 3000-3200 lbs (1360-1450 kg) Wheelbase: 101.2 inches (2570 mm) Wheels Tires Wheel Size: 15-inch Alloy Wheels Tire Size Std: 205/55VR15 Bolt Pattern: 5x120 🛡️ Safety Features Ratings Crash Test Data: NHTSA ratings not standardized in 1991; historical data may be limited Active Features ABS: Standard Anti-lock Braking System (ABS) Passive Features Airbags: Driver-side airbag standard Seatbelts: 3-point seatbelts front and rear 💡 Technology Features Infotainment Radio System: Factory AM/FM cassette stereo, optional CD player Onboard Computer: Optional On-Board Computer (OBC) with diagnostics Driver Assistance Cruise Control: Available Connectivity Early Electronic Systems: Limited by 1991 standards, focused on core vehicle functions 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000-7,500 miles or annually Coolant Flush: Every 2 years or 30,000 miles Spark Plug Replacement: Every 30,000 miles Timing Belt Replacement: Critical: Every 60,000 miles or 5 years (failure can cause catastrophic engine damage) Fluid Specifications Brake Fluid: DOT 4 Power Steering Fluid: ATF Dexron II or III Known Issues Common Wear Items: Bushings (control arm, trailing arm), heater control valve, fuel pump, front strut mounts Engine Specific: Head gasket leaks (less common on M20 than some later BMW engines), vacuum leaks Electrical Common: Failing OBC (On-Board Computer) display, MAF sensor issues 📚 Vehicle History Brand Heritage Bmw Legacy: BMW's reputation for...