Positioning:
Flagship Grand Tourer from Porsche, representing a significant departure from traditional rear-engine sports cars
Competitors:
Jaguar XJ-S, BMW 6 Series, Mercedes-Benz SEC models
Design Philosophy:
Front-engine, rear-wheel-drive V8 powertrain, transaxle design for optimal weight distribution, advanced technology for its era
Target Audience:
Luxury grand touring enthusiasts seeking performance, comfort, and innovative engineering
Usefulness:
Essential for DIY enthusiasts and professional mechanics to maintain and repair the complex systems of the Porsche 928
Primary Coverage:
Workshop service and repair
Secondary Coverage:
Maintenance, diagnostics, troubleshooting, adjustments, removal/installation, disassembly/assembly
Type:
Workshop Service Repair Manual
Accessibility:
Instant Download
Engine:
Complete engine systems, including V8 mechanicals, fuel injection, ignition, cooling, lubrication, exhaust
Transmission:
Automatic and manual transmission systems, clutch, driveshafts, differential
Chassis:
Suspension (front and rear transaxle), steering, braking systems (including ABS if applicable for later years within this range)
Electrical:
Wiring diagrams, lighting, instrumentation, power windows, climate control, starter, alternator
Bodywork:
Body panel removal/installation, glass, doors, interior trim, bumpers
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, tune-ups
Repair:
Step-by-step repair procedures for all major vehicle components
Diagnostics:
Troubleshooting guides, symptom-based diagnostics, fault code interpretation (if applicable)
Adjustments:
Alignment, idle speed, brake adjustments, shift linkage adjustments
Special Tools:
Identification and usage of required special service tools
Depth:
Comprehensive from bumper-to-bumper, including internal component rebuilds
Documentation Style:
Detailed step-by-step explanations, pictorial diagrams, exploded views, photos
Information Types:
Special notes, important points, service data, precautions, wear limits, tightening torques
Engine Type:
V8 (V-engine with 90-degree cylinder bank angle)
Displacement Early Models:
4.5 Liters (4474 cc)
Aspiration:
Naturally Aspirated
Horsepower Early Models:
Approx. 240 hp (DIN) at 5500 rpm
Torque Early Models:
Approx. 360 Nm (266 lb-ft) at 4000 rpm
Fuel Delivery:
Bosch L-Jetronic Fuel Injection
Fuel Type:
Unleaded gasoline
Ignition System:
Electronic ignition (e.g., Breakerless)
Standard Transmission:
5-speed manual transaxle
Optional Transmission:
3-speed automatic transaxle (e.g., by ZF)
Drive Layout:
Rear-wheel drive with rear-mounted transaxle (engine front, transmission rear)
Gear Ratios:
Specific ratios detailed within the manual
Transmission Fluid Type:
Refer to manual for specific automatic transmission fluid (e.g., Dexron II) and manual gearbox oil specifications
Crash Testing:
Information on era-specific safety standards and design considerations, though formal ratings like modern NCAP were not prevalent
Brakes:
Four-wheel disc brakes, power assisted. ABS available on later models within this range (e.g., 1980 onwards).
Steering:
Power-assisted rack-and-pinion steering
Restraints:
Seat belts (3-point front), safety cage construction
Lighting:
Halogen headlamps (pop-up design)
Audio System:
Factory fitted radio/cassette players, often with premium sound options for the era.
Cruise Control:
Standard on many models.
Connectivity Features:
Limited by era; primarily focused on basic vehicle functions.
Climate Control:
Air conditioning, often with automatic temperature control on higher trims.
Power Accessories:
Power windows, power mirrors, power seats (optional/standard depending on trim).
Oil Change:
Typically every 10,000-15,000 km (6,000-9,000 miles) or annually. Specifics in manual.
Timing Belt Replacement:
Crucial for V8 engines; interval typically around 50,000-80,000 km (30,000-50,000 miles). Refer to manual for precise interval and procedure.
Engine Oil Type:
High-quality multi-viscosity oil, e.g., 10W-40 or 20W-50, API SF or SG specification. Manual confirmation essential.
Engine Oil Capacity:
Approx. 8.5 Liters (9 US Quarts) with filter. Exact capacity detailed in manual.
Coolant Type:
Ethylene glycol-based antifreeze, typically a 50/50 mix with distilled water. Specific Porsche approved coolant recommended.
Brake Fluid Type:
DOT 3 or DOT 4, depending on specific system requirements. Manual verification is critical.
Common Wear Items:
Timing belt, tensioners, water pump, fuel injectors, suspension bushings, HVAC blower motor, electronic control units (ECUs) of the era.
Electrical Concerns:
Degradation of wiring insulation and connectors, especially in hot engine bay environments.
Brand Focus:
Porsche is renowned for its high-performance sports cars, precision engineering, and racing heritage.
928 Genesis:
Developed to be a more luxurious and comfortable GT successor to the 911, but ultimately co-existed for many years.
Early Years Impact:
Introduced with a bold design and front-engine V8 layout, setting Porsche apart.
Production Period Relevant:
1978-1995 (This manual covers the initial 5 years of production)
