Description
Factory Porsche 928 Workshop Manual (1978–1995)
This factory-level service manual is your definitive technical reference for every Porsche 928 built between 1978 and 1995, covering the full model run from the original base car through the high-output GTS finale. Written for hands-on workshop use, it delivers torque specs, wiring schematics, and step-by-step procedures in a single searchable PDF.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | 4.5L M28/01–M28/18 V8; 5.0L M28/41–M28/47 V8; 5.4L M28/49–M28/50 V8 |
| Diesel | N/A |
| Transmissions | 5-speed manual transaxle; 3-speed automatic; 4-speed automatic |
| Drive | RWD (rear-mounted transaxle) |
| Model Years | 1978–1995 |
| Badge Twins | N/A |
Common 928 Repairs Covered
| System | Procedures |
|---|---|
| Timing Belt & Tensioner | Belt replacement intervals, tensioner adjustment, and cam timing verification for all M28-series V8s — a critical service on these engines |
| LH-Jetronic / K-Jetronic Fuel Injection | Injector cleaning, fuel pressure testing, mass air sensor diagnosis, and cold-start system repair |
| Torque Tube & Rear Transaxle | Torque tube bearing replacement, transaxle fluid service, and clutch hydraulic bleeding procedures |
| Cooling System | Thermostat replacement, water pump overhaul, radiator hose inspection, and coolant flush sequences to address known overheating tendencies |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Which 928 variants are included in this manual?
All production variants are covered: the base 928 (1978), 928 S (1980+), 928 S4 (1987+), 928 GT (1989+), and the top-spec 928 GTS (1992–1995). Every chassis within the 928 lineage is addressed with model-specific procedures and specifications.
Does this manual cover the rear-mounted transaxle unique to the 928?
Yes. The 928’s distinctive rear-mounted transaxle layout — including the torque tube connecting it to the front engine — receives full coverage. Rebuild specs, bearing tolerances, and clutch/hydraulic procedures are all documented for both manual and automatic configurations.
Are wiring diagrams included for the 928’s complex electrical systems?
Yes. Complete circuit diagrams cover engine management (K-Jetronic and LH-Jetronic), ABS, climate control, central locking, and the 928’s signature instrument cluster. Connector pinouts and ground locations are included to simplify fault tracing.
What format is the manual?
This manual is a PDF file delivered via instant download after purchase. It is fully searchable, printable, and compatible with Windows, Mac, iOS, and Android devices. No proprietary software is required — any standard PDF reader will open it. Lifetime re-download access is included with your purchase.
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