🏷️ Basic Information Identification Make: Porsche Model: 928 Model Variants: 928 S, 928 S4, 928 GT, 928 GTS Product Name: PORSCHE 928 Service Repair Manual-928S S4 GT GTS Online 1978-1994 Codes Chassis Codes: Type 928 👋 Introduction Market Position Positioning: The Porsche 928 was a groundbreaking luxury grand tourer, a significant departure from Porsche's traditional rear-engined sports cars, aiming to compete with established luxury GTs. This manual caters to owners who appreciate the 928's unique engineering and wish to maintain or repair it themselves. Competitive Analysis Competitors: Ferrari 400 GT, Aston Martin V8 Vantage, Maserati Quattroporte, Jaguar XJ-S. Key Features Unique Selling Points: Transaxle design for near-perfect weight distribution, advanced (for its time) technology, V8 engine, comfortable GT capabilities. 📋 Manual Details Coverage Areas Years Covered: 1978-1994 Variants Covered: 928, 928 S, 928 S4, 928 GT, 928 GTS Page Count Estimated Page Count: Extensive (likely several thousand pages across all covered models/years) Manual Type Type: Service and Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Powertrain: Engine mechanicals, fuel injection, cooling, exhaust, ignition, transmission (manual and automatic), drivetrain, differential. Chassis: Suspension (front and rear transaxle), steering, brakes (hydraulic, ABS), wheels, tires. Electrical: Wiring diagrams, battery, charging system, starting system, lighting, instruments, climate control, power accessories, diagnostic systems. Body: Body construction, exterior panels, doors, windows, glass, trim, interior components, seating, HVAC system. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, tune-ups, inspections. Repair Overhaul: Engine disassembly, reassembly, head gasket replacement, transmission overhaul, brake caliper rebuild, suspension component replacement. Diagnostics: Troubleshooting guides, symptom-based diagnostics, fault code interpretation, electrical system diagnosis. Specifications: Torque specifications, clearances, tolerances, fluid capacities, wiring harness routing. Technical Depth Depth: Comprehensive: Covers basic maintenance to complete engine and transmission rebuilds, including detailed diagnostic procedures. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable (if OCR processed) Print Quality Printability: High quality, suitable for home printing of individual sections or the entire manual. Binding Type Binding: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: V8, naturally aspirated Displacement Early Models: 4.5 Liters (4474 cc) Displacement S Models: 4.7 Liters (4664 cc) Displacement S4 Gt Gts Models: 5.0 Liters (4999 cc) Engine Code Early: M28/01, M28/02 Engine Code S: M28/09, M28/10 Engine Code S4: M28/41, M28/42 Engine Code Gt: M28/49 Engine Code Gts: M28/50 Performance Horsepower Early Models: 219-228 hp @ 5500 rpm (depending on market and spec) Horsepower S Models: 306 hp @ 6000 rpm (US spec) Horsepower S4 Models: 316 hp @ 6000 rpm (US spec) Horsepower Gt Models: 326 hp @ 6000 rpm Horsepower Gts Models: 306 hp @ 6000 rpm (later models) Torque S4 Models: 315 lb-ft @ 4500 rpm (US spec) Fuel System Fuel Injection: Bosch K-Jetronic (early) evolving to Bosch DME (Digital Motor Electronics) with L-Jetronic or similar on later S4/GT/GTS models. Fuel Type: Unleaded Premium Unleaded Gasoline Engine Construction Block Material: Aluminum Alloy Cylinder Head Material: Aluminum Alloy 🔧 Transmission Standard Transmission Type Early: 5-speed Manual Transaxle Transmission Type Later: 5-speed Manual Transaxle (e.g., G37 for GT) Optional Transmission Type Early: 3-speed Automatic Transaxle (e.g., 090 for early models) Transmission Type Later: 4-speed Automatic Transaxle (e.g., 026 for S4/GT/GTS) Features Transaxle Design: Rear-mounted transaxle combining gearbox and differential for optimal weight distribution. Fluid Specifications Automatic Transmission Fluid: Porsche ATF (refer to manual for specific type like Dexron II or equivalent), capacity approx. 8.5 liters. Manual Transmission Fluid: SAE 75W-90 GL-4 or GL-5 gear oil, capacity approx. 2.5 liters. 📐 Dimensions Exterior Length: Approx. 4700-4770 mm (varies by model year) Width: Approx. 1800 mm Height: Approx. 1280-1320 mm (varies by model year) Weights Curb Weight: Approx. 1550-1700 kg (varies significantly by model and options) Gross Vehicle Weight: Approx. 2000-2090 kg 🛡️ Safety Features Ratings Crash Test Results: N/A specific ratings for the era, but designed with structural integrity. The 928 featured a robust chassis and integrated safety cell. Active Features Braking System: Ventilated disc brakes front and rear. ABS (Anti-lock Braking System) introduced on S4 models and standard thereafter. Suspension Features: Independent suspension front and rear, often with self-leveling rear suspension on some models for stable handling under load. Passive Features Airbags: Driver's airbag introduced from 1990 model year onwards. Seatbelts: Three-point inertia reel seatbelts, sometimes with pre-tensioners on later models. 💡 Technology Features Infotainment Audio System: Factory premium sound systems (e.g., Blaupunkt, Sound System 8 speakers), often with cassette decks. Later models may have CD players and improved speaker configurations. Driver Assistance ABS: Standard on S4, GT, GTS models. Provides enhanced braking control during hard stops. Cruise Control: Standard across most models. Connectivity Diagnostics Port: On-board diagnostics (OBD) system, evolving from basic to more sophisticated DME controlled systems on later models. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 7,500 - 10,000...