🏷️ Basic Information

Make:

Porsche

Model:

928

Model Years Covered:

1977-1995

Internal Project Code:

Project 928

👋 Introduction

Segment:

Luxury Grand Tourer (GT)

Competitors:

Ferrari 400/412, Aston Martin Lagonda, Jaguar XJ-S, BMW 8 Series (later in its run), Mercedes-Benz SEC models.

Design Philosophy:

Front-engine, rear-wheel-drive transaxle layout, V8 engine, advanced aerodynamics, comfortable yet sporty GT characteristics, often featuring innovative technologies for its era.

Value Proposition:

Essential tool for maintaining and repairing the complex systems of the Porsche 928, enabling cost savings through DIY work and ensuring proper maintenance for longevity.

📋 Manual Details

Scope:

Comprehensive service and repair for the entire vehicle lifecycle.

Estimated Pages:

Likely exceeds 1000 pages, typical for factory service manuals covering such a long production run and complex vehicle.

Type:

Factory Service Manual / Workshop Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Powertrain:

Engine mechanicals, fuel delivery, ignition, cooling, lubrication, exhaust, emissions control, automatic transmission (including early transaxle types), manual transmission (where applicable), clutch, driveshafts, differential, axles.

Chassis:

Suspension (front and rear), steering system (including power steering), wheel bearings, brake system (including hydraulic, ABS where applicable, parking brake), tire and wheel specifications.

Electrical:

Wiring diagrams, lighting, starting and charging system, instrument panel, gauges, engine control unit (ECU) diagnostics, multiplex communication (CAN), power windows, central locking, wipers, washers, horn, audio/visual systems, HVAC controls, cruise control, seat belt pre-tensioners, engine immobilizer.

Body And Interior:

Body panels, doors, hood, glass, mirrors, interior trim, seats, instrument panel removal and installation, seals, weatherstripping.

Maintenance:

Scheduled maintenance intervals, fluid checks and changes (oil, coolant, brake fluid, transmission fluid), filter replacements, spark plug service, belt inspection and replacement, general inspections.

Repair And Overhaul:

Engine removal/installation, cylinder head work, piston/ring replacement, crankshaft/bearing service, fuel injector servicing, transmission overhaul, brake caliper/rotor replacement, suspension component replacement, steering rack rebuild, electrical component diagnosis and repair, HVAC system service.

Diagnostics And Troubleshooting:

Troubleshooting charts based on symptoms, diagnostic codes (OBD I), component testing procedures, electrical circuit tracing.

Depth:

Extremely detailed, covering from basic maintenance to complete engine and transmission rebuilds, including specific torque specifications, clearances, and diagnostic procedures. Suitable for professional mechanics and advanced DIY enthusiasts.

📊 Manual Specifications

Quality:

PDF format with searchable text and high-resolution diagrams, ensuring clarity for printing and digital viewing.

Printability:

Designed to be printable, allowing users to carry specific sections into the garage. Pages are formatted for standard printing.

Binding:

N/A (Digital PDF)

Paper:

N/A (Digital PDF)

⚙️ Engine Specifications

Variant 1:

4.5L V8 (M28/01-M28/03)

Variant 2:

4.7L V8 (M28/09-M28/11, M28/15, M28/16, M28/17, M28/19, M28/21)

Variant 3:

5.0L V8 (M28/41, M28/42, M28/44, M28/46)

Variant 4:

5.4L V8 (M28/52, M28/53)

Horsepower Range:

Approximately 219 hp (early 4.5L) to 326 hp (late GTS 5.4L).

Torque Range:

Approximately 236 lb-ft (early 4.5L) to 369 lb-ft (late GTS 5.4L).

Induction Early:

Bosch K-Jetronic (CIS) mechanical fuel injection

Induction Later:

Bosch Motronic electronic fuel injection

Block Material:

Aluminum alloy

Head Material:

Aluminum alloy

🔧 Transmission

Type:

Automatic Transaxle (e.g., 3-speed, 4-speed automatic with manual shifting modes in later models)

Type:

5-speed Manual Transaxle (available on select models/markets, particularly early production and specific trims).

Transaxle Layout:

Rear-mounted transaxle combining clutch, gearbox, and differential for optimal weight distribution.

Automatic Transmission Fluid:

Typically Dexron II or equivalent, consult manual for exact specification by year and model. Capacity approximately 8-10 liters.

Manual Transmission Fluid:

GL-4 or GL-5 gear oil, consult manual for viscosity (e.g., 75W-90). Capacity approximately 2.5 liters.

📐 Dimensions

Length:

Approx. 4655-4760 mm (183.3-187.4 inches) depending on year.

Width:

Approx. 1775-1820 mm (69.9-71.7 inches) depending on year.

Height:

Approx. 1280-1320 mm (50.4-52.0 inches) depending on year.

Curb Weight:

Approx. 1530-1750 kg (3373-3858 lbs) depending on engine and transmission.

Gross Vehicle Weight Rating:

Typically around 2050-2150 kg (4519-4740 lbs).

🛡️ Safety Features

Braking System:

Four-wheel disc brakes. Later models featured ABS (Anti-lock Braking System).

Suspension:

Advanced suspension geometry, often including front MacPherson struts and rear trailing arms/transverse links, designed for stability and handling.

Body Structure:

Designed with a robust safety cage and crumple zones.

Restraint Systems:

Seat belts (3-point), padded interior surfaces, later models introduced driver and passenger airbags.

💡 Technology Features

Early Systems:

Basic AM/FM radio, cassette player. Later models offered more integrated audio systems.

ABS:

Available on later models (S4 onwards) as an option, improving braking safety.

Multiplex Communication:

Later models incorporated multiplex wiring systems and CAN communication for integrated control of various vehicle functions, enhancing diagnostics and features.

🔧 Maintenance

Oil Change:

Typically every 5,000-7,500 miles or annually. Consult manual for specific mileage and time intervals by model year.

Timing Belt Replacement:

Crucial for V8 engines; typically every 30,000-50,000 miles or 4-5 years. Failure can cause severe engine damage. Manual will specify exact interval and replacement procedure.

Coolant Flush:

Every 2-3 years or 30,000 miles.

Engine Oil:

Multi-viscosity oil, typically 10W-40 or 10W-50, API service classification SF or higher. Consult manual for precise specifications. Oil capacity approximately 8-10 liters.

Coolant:

Ethylene glycol based coolant, typically a 50/50 mix with distilled water. Porsche Type 2 coolant or equivalent. Capacity around 12-15 liters.

Brake Fluid:

DOT 3 or DOT 4, consult manual for specific type and replacement interval (typically every 2 years).

Fuel System Components:

Aging fuel lines, injectors, and fuel pumps can cause starting issues or rough running, especially on K-Jetronic systems.

Timing Belt Tensioner:

Failure of the timing belt tensioner or pulleys can lead to belt failure and engine damage. Regular inspection and replacement are critical.

Electrical Gremlins:

Due to age and complex wiring, electrical issues can arise, affecting everything from lighting to engine management. Thorough diagnostics are key.

Suspension Bushings:

Wear in rubber suspension bushings can lead to poor handling and increased road noise.

📚 Vehicle History

Manufacturer:

Porsche AG, Germany

Design Concept:

Intended as a modern, comfortable, and high-performance GT that could replace the 911 as Porsche's flagship. Featured a V8 engine and front-engine layout, a departure from Porsche's traditional rear-engine sports cars.

Generations:

The 928 spanned multiple evolutionary stages, with significant updates to engines, transmissions, suspension, brakes, and interior features throughout its 18-year production run (e.g., 928 S, S2, S3, S4, GT, GTS).

Production Years:

1977-1995

Manufacturing Location:

Stuttgart, Germany

🏆 Awards & Recognition

Designer Award:

The Porsche 928 was named 'European Car of the Year' in 1978, a significant achievement for a sports car and a testament to its innovative design and engineering.