Buyers Guide to:
1977 to 1995
Porsche Club Great Britain
The Porsche 928 was actually intended by the company as a replacement for the rear-engine 911, which would certainly have upset the enthusiasts. Luckily, Porsche changed their minds and the impressive grand tourer would stay in production alongside the air-cooled model until 1995. The coupe was launched at the 1977 Geneva Motor Show, featuring innovations such as polyurethane bumpers and an instrument pod that moved when the steering wheel was adjusted. It was clever stuff back then, and helped the 928 to win the 1978 Car of the Year award – the only sports car to do so. Powered by a front-mounted 4.5-litre V8 at launch, engine size and power outputs would grow during production with the last models featuring a 345bhp, 5.4-litre engine.
- See checklist below
- The condition of the bodywork very carefully as major repairs will be eye-wateringly expensive. The 928 uses aluminium panels over a galvanised steel frame, and although corrosion is rare, the car could have suffered crash damage
- That the big polyurethane bumpers are undamaged – they are very expensive to replace. And ensure the pop-up headlamps are working okay as replacement motors are pricey
- The luggage area for damp, as damaged or perished tailgate seals will let water in
- The V8 engine for oil and coolant leaks which can be time-consuming to cure thanks to the lack of space in the engine bay. Signs of head gasket failure is very bad news, while a detailed service history is crucial for peace of mind as these cars can’t be run on shoestring
- That cam belt changes have been done on time. The engine won’t suffer major damage if it fails, but it’s a tricky and expensive job and may have been ignored
- For a corroded or leaking exhaust system – it’s a four-figure bill to replace
- The engine runs cleanly as engine management faults can be time-consuming and costly to rectify
- For worn synchromesh or a baulky gearshift on manual cars. And ensure the clutch isn’t juddering or slipping. The gearbox is mounted in a transaxle at the rear, and it needs checking for oil leaks, tooThat an automatic model drives without any odd noises or vibration. The Mercedes-Benz ‘box is generally long-lasting but can suffer from incorrect tension/cracking of the flex-plate at the flywheel, which can ultimately lead to wear of the crankshaft thrust bearing and engine failure
- For judders that signify wear of the drive shaft bearings within the torque tube connecting the engine to the transaxle. It’s possible to replace the bearings separately, and much cheaper than a new torque tube
- The suspension for evidence of wear in the front wishbone bushes, and in the ‘Weissach’ rear axle. Leaking dampers also need checking for, and bear in mind that a suspension overhaul will cost four figures
- The condition of the brakes. The 928 is a heavy car and will eat through discs and pads if used hard
- For signs of uneven tyre wear signifying suspension geometry that’s gone awry. Kerbed wheels can be refurbished at a reasonable cost, but ensure there are no fluid leaks from the power steering pump or hoses
- The condition of the trim as renovating it will be costly. The chequerboard ‘Pasha’ cloth trim on some cars can be sourced from specialists, at a price
- That everything works in the cabin, paying particular attention to the vacuum-operated central locking, and the air-conditioning. There was lots of equipment, and a penny-pinching owner might have ignored failed items
- There’s no sign of electrical problems. The system is complex and tracing/repairing faults can get very expensive
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