🏷️ Basic Information Identification Make: BMW Model: 3-Series Chassis Code: E30 Variant: 320i Model Years Covered: 1987-1991 Codes Engine Code: M20B20 👋 Introduction Market Position Segment: Compact Executive Sedan/Coupe Reputation: Renowned for driving dynamics, build quality, and sporting heritage Competitive Analysis Key Competitors: Mercedes-Benz W201 (190E), Audi 80/90, Alfa Romeo 75, Volvo 240 Key Features E30 Handling: Excellent chassis balance, independent rear suspension, driver-focused feel Design: Iconic 'Neue Klasse' design language, clean lines, compact proportions Powertrain: Reliable M20 inline-six engines known for smooth power delivery 📋 Manual Details Coverage Areas Primary Focus: Comprehensive Factory Service and Repair Scope: All mechanical, electrical, and body systems Page Count Estimated Pages: 700+ Manual Type Type: Factory Service Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed overhaul, tuning, component testing, lubrication system, cooling system, fuel delivery system, exhaust system Engine Management: L-Jetronic fuel injection system, ignition system, sensor diagnostics, ECU functionality Transmission Manual: Clutch operation, gearbox overhaul, shift linkage adjustment, gear ratios Transmission Automatic: Operation, fluid service, basic troubleshooting (if applicable to 320i E30 models) Drivetrain: Driveshafts, CV joints, differential maintenance and repair Suspension: Front and rear suspension components, geometry adjustments, shock absorber and spring replacement, bushings Steering: Steering rack, power steering system, linkage components, alignment procedures Brakes: Front and rear brake systems (discs/drums), hydraulic system, ABS (if equipped), parking brake, bleeding procedures Electrical System: Battery, charging system (alternator), starting system (starter motor), lighting systems, fuse box diagrams, wiring schematics Body And Chassis: Body panel removal and installation, interior trim, rust repair techniques, jacking points HVAC: Heating, ventilation, and air conditioning system service and repair Procedures Included Maintenance: Routine service (oil changes, filter replacements, tune-ups), fluid checks and changes, belt and hose inspection Troubleshooting: System-specific diagnostic charts, common fault identification, root cause analysis Repair: Component replacement, adjustment procedures, overhaul instructions Diagnostics: On-board diagnostics (OBD) interpretation (early systems), multimeter usage, component testing methods Specifications: Torque values, clearances, fluid types and capacities, electrical specifications Special Tools: Identification and usage of BMW-specific tools required for certain repairs Technical Depth Level: Professional Factory Level - Suitable for DIY and professional mechanics Rebuild Procedures: Complete engine and transmission rebuild procedures Electrical Schematics: Detailed, high-resolution wiring diagrams for all vehicle systems 📊 Manual Specifications File Format Type: Portable Document Format (PDF) Searchability: Fully text-searchable for quick information retrieval Print Quality Resolution: High-resolution, suitable for printing individual pages or the entire manual Binding Type Digital Format Advantage: No physical binding; easily accessible on multiple devices Paper Type Digital Format Advantage: Environmentally friendly, no physical paper required Completeness Content: Complete official factory documentation ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, SOHC Displacement: 1990 cc (2.0 Liters) Bore X Stroke: 80.0 mm x 66.0 mm Compression Ratio: 8.8:1 or 9.1:1 (depending on market/exact version) Performance Horsepower: Approx. 129 PS (127 hp) at 6000 rpm (DIN) Torque: Approx. 174 Nm (128 lb-ft) at 4300 rpm (DIN) Fuel System Injection System: Bosch L-Jetronic (or Motronic MA 1.3/2.1 depending on year/market) Fuel Type: Unleaded Petrol (Octane rating varies by market, typically 95 RON recommended) Ignition System Type: Electronic Ignition (Distributor-based) 🔧 Transmission Standard Type: 4-Speed Manual (Getrag 245) Optional Type: 3-Speed Automatic (ZF 3HP22) Features Manual Gear Ratios: Refer to manual for specific ratios (e.g., 1st: ~3.72, 2nd: ~2.05, 3rd: ~1.32, 4th: 1.00) Fluid Specification Manual: BMW MTF LT-2 or equivalent (e.g., Pentosin ATF T-4) Automatic: Dexron II or equivalent 📐 Dimensions Exterior Length: Approx. 4325 mm (170.3 in) Width: Approx. 1675 mm (65.9 in) Height: Approx. 1380 mm (54.3 in) Wheelbase: Approx. 2570 mm (101.2 in) Weights Curb Weight: Approx. 1200-1280 kg (2645-2822 lbs) Gross Vehicle Weight Rating: Refer to vehicle specific plate 🛡️ Safety Features Ratings Crash Test Data: Limited official data from the period; E30 known for robust construction and driver engagement over electronic aids. Active Features ABS: Optional on later models, standard on some variants Passive Features Seatbelts: Three-point seatbelts with pretensioners (later models) Body Structure: Reinforced safety cell, crumple zones 💡 Technology Features Infotainment System: Basic analog/digital radio systems, cassette player Driver Assistance Features: Limited by modern standards; ABS was optional Connectivity Features: N/A (pre-internet era) 🔧 Maintenance Service Intervals Oil Change: Typically every 10,000-15,000 km (6,000-9,000 miles) or annually Air Filter: Inspect every 10,000 km, replace as needed (approx. 30,000 km) Spark Plugs: Replace typically every 30,000-50,000 km depending on type Coolant Flush: Every 2-3 years or 40,000-60,000 km Fluid Specifications Engine Oil: SAE 10W-40 or 15W-40 API SG/SH rated (Check manual for specific viscosity and API rating) Engine Oil Capacity: Approx. 4.5 Liters (with filter change) Coolant: BMW Blue Antifreeze or equivalent (50/50 mix with distilled water) Brake Fluid: DOT 3 or DOT 4 Known Issues Common Problems: Cracked dashboards (UV damage), fuel pump failure, injector seal leaks, coolant hose degradation, rear subframe mount fatigue, tendency for rust (wheel...