🏷️ Basic Information Identification Make: BMW Model: 7 Series Chassis Code: E23 Year: 1979 Codes Engine Codes: M30B28, M30B30, M30B32, M30B33 👋 Introduction Market Position Manual Value Proposition: Provides dealership-level technical information for the classic BMW E23 7 Series, enabling owners to perform maintenance, diagnosis, and repairs themselves, saving on labor costs and extending vehicle life. Competitive Analysis Manual Advantage: Vehicle-specific and factory-sourced, offering unparalleled accuracy and detail compared to generic repair guides. Offers the convenience of a digital, searchable, and printable format. Key Features Unique Selling Points: Contains comprehensive step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications. All information is contained within a single, easy-to-use PDF. 📋 Manual Details Coverage Areas Coverage Scope: All models and all repairs A-Z for the 1979 BMW 7 Series E23 Page Count Estimated Page Count: Likely several hundred pages, characteristic of comprehensive factory service manuals. Manual Type Manual Format: PDF Language Language: English Format Digital Format: Downloadable PDF, compatible with Windows Vista/XP/ME/98/NT/2000 and Mac. 📖 Manual Coverage Systems Covered Engine And Control: Engine overhaul, maintenance, fuel system service specifications, emission control systems, intake, exhaust, cooling, lubrication, ignition, starting, charging, engine immobilizer, cruise control. Drivetrain: Automatic transmission, manual transmission, clutch, transfer case (if applicable to specific E23 variants), propeller shaft, driveshaft, differential, axle, suspension. Chassis And Brakes: Tires and wheels, brake control systems, hydraulic brakes, parking brake, steering column, power steering. Electrical And Electronics: Complete electrical system, wiring schematics, multiplexing/CAN communication, battery, starter, alternator, lighting, instrumentation, audio/visual systems, horn, door locks, power windows, power mirrors. Body And Interior: Air conditioning, supplemental restraint system (airbags, seat belts), interior trim, seats, engine hood, doors, exterior body panels, glass, mirrors, instrument panel, wipers and washers. Procedures Included Diagnostic And Repair: Step-by-step repair instructions, diagnostic procedures, troubleshooting guides, component removal and installation, adjustment procedures, and rebuild instructions. Technical Depth Depth Of Information: Factory-level detail, equivalent to what dealership technicians use. Covers basic maintenance to complete engine and transmission rebuilds, electrical diagnostics, and chassis work. 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: All pages are printable, allowing for enlarged diagram printing. Binding Type Binding Analogy: Digital, eliminating the need for physical binding. Users print only necessary pages. Paper Type Paper Analogy: Digital, preventing grease stains and tears associated with physical manuals. ⚙️ Engine Specifications Primary Engine Engine Family: BMW M30 Straight-6 (Slant-6) Performance Common Engine Variants: M30B28 (2.8L), M30B30 (3.0L), M30B32 (3.2L), M30B33 (3.3L) Fuel System Fuel Delivery: Typically Bosch L-Jetronic or Motronic fuel injection, depending on the specific engine and model year within the E23 range. Engine Construction Block And Head Material: Cast iron block, aluminum alloy cylinder head. Engine Timing Valve Actuation: Single overhead camshaft (SOHC) driven by a timing chain. 🔧 Transmission Standard Transmission Options: Typically a 3-speed or 4-speed automatic transmission (e.g., ZF 3HP22 or 4HP22). A 4-speed manual transmission was also available on some models. Optional Manual Transmission Gears: 4-speed manual Features Automatic Transmission Control: Hydraulic control, often with 'Sport' and 'Economy' modes. 📐 Dimensions Exterior Wheelbase: Approximately 2,863 mm (112.7 inches) for most E23 models. Overall Length: Varies by specific E23 model and market, typically around 4,840 mm (190.5 inches). Weights Curb Weight: Ranging from approximately 1,550 kg to 1,750 kg (3,417 to 3,858 lbs) depending on engine and equipment. 🛡️ Safety Features Ratings Crash Safety Era: While official crash test ratings from modern organizations are not available for this era, BMW historically prioritized safety features and structural integrity. Passive Features Passive Safety Equipment: Safety crumple zones, padded interior, laminated windshield, three-point seat belts (often manual retracting), reinforced door beams. Supplemental Restraint System: Seat belts. Early E23 models might not have had standard airbags, but later versions or specific market models could. 💡 Technology Features Infotainment Audio System: Early aftermarket or factory-installed AM/FM radio with cassette player. Basic speaker systems. Driver Assistance Driver Aid Features: Power steering, power brakes. Anti-lock braking system (ABS) was an optional feature for later E23 models, possibly available in 1979 on higher trims or specific markets. Connectivity Early Automotive Connectivity: Minimal to non-existent by modern standards. Focus was on mechanical and electrical systems. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions and oil used (check manual for exact recommendation). Major Service Milestones: Spark plugs, timing belt/chain inspection, coolant flush, brake fluid flush at intervals typically specified in tens of thousands of miles (e.g., 30,000-60,000 miles). The M30 uses a timing chain, which is generally long-lasting but requires inspection. Fluid Specifications Engine Oil Specification: API SF or SG rated multi-viscosity oil, e.g., 20W-50 or 15W-40, depending on climate. Refer to manual for precise BMW-approved oils and grades. Coolant Specification: BMW Blue coolant or equivalent ethylene glycol-based antifreeze mixed 50/50 with distilled water. Transmission Fluid Automatic: Dexron III or equivalent ATF. Consult manual for exact specification...