Market Position:
The Porsche 928 GT was a high-performance grand tourer, positioned as a more comfortable and technologically advanced alternative to the 911, but with the performance expected of the Porsche marque. It targeted a more mature buyer seeking luxury and speed.
Competitive Analysis:
Competed against other luxury grand tourers of its era, such as the Jaguar XJ-S, Aston Martin Virage, and certain models from Mercedes-Benz and BMW. The 928 GT stood out with its unique V8 engine, transaxle layout, and advanced technology for its time.
Key Features:
Front-engine, rear-wheel drive, V8 power, advanced suspension, aerodynamic design, luxurious interior, strong performance figures.
Engine:
4.7L V8 (M28.42), including disassembly, assembly, diagnosis, and troubleshooting
Fuel System:
Bosch LH-Jetronic fuel injection, fuel pump, lines, injectors, diagnosis and repair
Ignition System:
Electronic ignition system, coil, distributor, spark plugs, diagnosis and adjustment
Cooling System:
Radiator, water pump, thermostat, coolant lines, fan, diagnosis and service
Exhaust System:
Exhaust manifolds, catalytic converter, mufflers, pipes, inspection and repair
Transmission:
5-speed manual transaxle, clutch, gearshift mechanism, removal, installation, and overhaul
Drivetrain:
Driveshafts, CV joints, differential, inspection and service
Suspension Front:
Independent front suspension, control arms, ball joints, springs, shock absorbers, alignment
Suspension Rear:
Transaxle rear suspension, trailing arms, shock absorbers, springs, alignment
Steering System:
Power steering, steering rack, hydraulic pump, hoses, diagnosis and repair
Braking System:
Front and rear disc brakes, ABS (Anti-lock Braking System), brake lines, calipers, pads, rotors, bleeding procedures
Electrical System:
Battery, alternator, starter, wiring diagrams, lighting, fuses, relays, diagnosis
Climate Control:
Air conditioning system, heater, blower motor, controls, diagnosis and service
Bodywork Exterior:
Body panels, doors, hood, trunk, bumpers, glass, trim, alignment and repair
Bodywork Interior:
Seats, dashboard, door panels, trim, headliner, carpeting, removal and installation
Body Electronics:
Power windows, power locks, mirrors, wipers, horn, central locking system
Maintenance:
Routine maintenance, oil changes, filter replacements, fluid checks, tune-ups
Troubleshooting:
Diagnostic procedures, fault finding, common issues, error codes
Repair:
Component repair, system overhauls, part replacement
Disassembly Assembly:
Detailed step-by-step instructions for removing and installing all major components
Adjustments:
Engine, transmission, suspension, and brake adjustments
Technical Depth:
Full workshop level, covering all aspects from basic maintenance to complete engine and transmission rebuilds. Includes detailed torque specifications, clearances, and testing procedures.
Oil Change Interval:
Every 5,000-7,500 miles or annually, whichever comes first (refer to manual for exact specification).
Timing Belt Replacement:
Critical for V8 engines; typically every 30,000-60,000 miles or 4-5 years. Failure can cause catastrophic engine damage. Manual specifies interval.
Engine Oil Type:
Porsche A40 or similar synthetic oil, e.g., 5W-40 or 10W-40 (refer to manual for precise viscosity and API service classification).
Engine Oil Capacity:
Approx. 10.5 quarts (9.9 liters) with filter change.
Transmission Fluid Type:
GL-4 or GL-5 gear oil, SAE 75W-90 or 80W-90 (refer to manual).
Brake Fluid Type:
DOT 4 brake fluid.
Coolant Type:
Ethylene Glycol based antifreeze (e.g., Porsche approved coolant).
Known Issues:
Timing belt tensioner and idler pulley failure (critical), fuel accumulator, cooling fan relay, electrical harness degradation, A/C system leaks, suspension bushings wear, ABS sensor issues.
Torque Specifications:
The manual contains detailed torque specifications for all critical fasteners, essential for proper assembly and preventing damage.
