🏷️ Basic Information Identification Make: BMW Model: 7 Series Model Variants Covered: 728, 728i, 730, 732i, 733i, 735i, 745i Generation Chassis Code: E23 👋 Introduction Market Position Segment: Luxury Sedan Competitive Analysis Competitors: Mercedes-Benz S-Class (W116/W126), Jaguar XJ, Cadillac Eldorado Key Features Design Philosophy: BMW's focus on driver engagement, performance, and refined luxury. Target Audience: Discerning buyers seeking a powerful, comfortable, and technologically advanced luxury automobile. 📋 Manual Details Coverage Areas Years Covered: 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987 Format Delivery Method: Downloadable (Digital Delivery) File Format Implied: PDF (requires Adobe Reader) Manual Type Type: Complete Workshop Service Repair Manual Language Language: English 📖 Manual Coverage Systems Covered Engine: All engine variants (M30 inline-six, including carbureted and fuel-injected versions) Transmission: All transmission types (Manual and Automatic) Electrical System: Full coverage including wiring diagrams, diagnostics, and component testing Chassis And Suspension: Detailed procedures for all suspension and steering components Braking System: Comprehensive coverage of front and rear braking systems, including ABS (where equipped) Fuel System: Carburetor and fuel injection system diagnosis and repair Cooling System: Radiator, fan, thermostat, and coolant system maintenance and repair Exhaust System: Catalytic converters, mufflers, and exhaust manifold repair and replacement Bodywork And Trim: Exterior and interior panel removal, repair, and alignment HVAC System: Heating, Ventilation, and Air Conditioning (HVAC) system diagnostics and repair Interior Systems: Seat adjustments, door mechanisms, dashboard components, and upholstery Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks, tune-ups, and inspections Engine Repair: Engine overhaul, component replacement (pistons, rings, bearings, valves), gasket replacement Transmission Repair: Manual and automatic transmission overhaul, clutch replacement, torque converter service Electrical Diagnostics: Troubleshooting electrical faults, testing components, wiring repairs Brake System Repair: Brake pad/shoe replacement, rotor/drum resurfacing/replacement, caliper/wheel cylinder service, brake line repair, ABS diagnostics Suspension And Steering Repair: Shock absorber/strut replacement, ball joint/tie rod end replacement, power steering system service Fuel System Repair: Carburetor adjustment/rebuild, fuel injector cleaning/replacement, fuel pump testing/replacement, fuel pressure regulation Cooling System Repair: Water pump replacement, radiator repair/replacement, hose replacement, thermostat replacement Body Panel Repair: Door alignment, panel replacement, rust repair, bumper repair/replacement HVAC Repair: Blower motor replacement, evaporator/condenser service, refrigerant charging, control panel repair Troubleshooting Guides: Diagnostic flowcharts and symptom-based troubleshooting Technical Depth Depth: Comprehensive (from basic maintenance to full engine/transmission rebuilds) 📊 Manual Specifications File Format Required Software: Adobe Reader (Free) Print Quality Printability: Fully printable (individual pages or chapters) Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Family: BMW M30 Straight-6 (Slant-6) Performance 728I/730: Approx. 170-184 hp (SAE Gross) 732I/733I: Approx. 184-197 hp (SAE Gross) 735I: Approx. 182-211 hp (SAE Gross) 745I: Approx. 214-252 hp (SAE Gross) Fuel System Injection Types: Bosch L-Jetronic, LE-Jetronic, Motronic (fuel injection) and Solex/Zenith carburetors (on early 728/730 models) Engine Codes Engine Code Examples: M30B28, M30B30, M30B32, M30B33, M30B34, M30B35 Displacement Cc 2.8L: 2784 cc 3.0L: 2986 cc 3.2L: 3210 cc 3.3L: 3295 cc 3.5L: 3430 cc 4.5L: 4470 cc (745i) 🔧 Transmission Standard Type: 4-speed manual (standard on some models) Optional Type: 3-speed automatic (e.g., ZF 3HP22) or 4-speed automatic (e.g., ZF 4HP22) (optional on most models) Features Automatic Features: Lock-up torque converter (on later models for improved efficiency) 📐 Dimensions Exterior Wheelbase Mm: 2865 mm (approx.) Length Mm: 4855 mm (approx.) Width Mm: 1798 mm (approx.) Height Mm: 1400 mm (approx.) Weights Curb Weight Kg: 1550 - 1750 kg (depending on model and equipment) 🛡️ Safety Features Ratings Crash Test Data: Limited formal crash test data available from this era compared to modern standards, but designed with advanced safety features for its time. Active Features ABS: Anti-lock Braking System (ABS) optional or standard on later models. Passive Features Airbags: Driver airbag (optional or standard on later models, not universally present across all E23s). Seatbelts: 3-point inertia-reel seatbelts Construction: Reinforced chassis and safety cage construction 💡 Technology Features Infotainment Audio System: Factory AM/FM stereo with cassette player, optional premium sound systems. Driver Assistance Cruise Control: Standard or optional on most models. Climate Control: Automatic climate control (optional or standard on higher trims). Connectivity Features: Limited by modern standards; primary connectivity involved diagnostic ports for early electronic systems. 🔧 Maintenance Service Intervals Oil Change: Typically every 5,000 - 7,500 miles or 6-12 months, depending on driving conditions. Air Filter: Inspect every 15,000 miles, replace as needed. Spark Plugs: Replace every 20,000 - 30,000 miles (depending on plug type). Coolant: Flush and replace every 2-3 years or 30,000 miles. Fluid Specifications Engine Oil: API SG or higher, SAE 20W-50 or 15W-40 recommended, 5.5 - 7.5 quarts (depending on engine). Transmission Fluid Auto: Dexron III (or equivalent) Coolant: BMW Blue (Glysantin G48) or equivalent ethylene glycol coolant, 50/50 mix with distilled water. Known Issues Engine Management: Age-related degradation of fuel injection components (e.g., AFM sensors, fuel distributors on early...