Description
Factory Ferrari 328 GTB / GTS Workshop Manual (1985-1989)
This is the factory-level service manual covering the Ferrari 328 GTB and 328 GTS across the full 1985-1989 production run – the essential technical reference for US owners, independent shops, and enthusiasts maintaining one of Ferrari’s most celebrated mid-engine V8 sports cars.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | Tipo F105CB 3.2L naturally aspirated 90° V8, DOHC, 4 valves per cylinder, Bosch KE-Jetronic fuel injection (~270 hp) |
| Diesel | N/A |
| Transmissions | 5-speed manual transaxle (rear-mounted, mid-engine layout) |
| Drive | RWD |
| Model Years | 1985, 1986, 1987, 1988, 1989 |
| Badge Twins | N/A |
Common 328 Repairs Covered
| System | Procedures |
|---|---|
| Cam Belt & Tensioner | Timing belt replacement interval inspection, tensioner adjustment, and complete cam belt renewal procedure – a critical service item on the F105CB V8 |
| Bosch KE-Jetronic Fuel Injection | Fuel distributor testing, warm-up regulator diagnosis, injector flow testing, and idle mixture adjustment |
| Clutch & Transaxle | Clutch disc and pressure plate replacement, transaxle removal, gear synchronizer inspection and rebuild specifications |
| Cooling System | Thermostat replacement, radiator and coolant hose service, water pump inspection – addressing known overheating concerns on high-mileage 328s |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Does this manual cover both the GTB coupe and the GTS targa?
Yes. The manual addresses both the 328 GTB (Gran Turismo Berlinetta fixed-roof coupe) and the 328 GTS (Gran Turismo Spider targa-top) body styles. Body-specific information such as roof panel removal, glass, and trim procedures is included alongside the shared mechanical content.
How critical is the cam belt service on the 328’s V8?
Extremely critical. The Tipo F105CB is an interference engine, meaning a failed timing belt causes catastrophic valve and piston damage. Ferrari specified replacement intervals that many owners extend at their peril. This manual contains the complete belt renewal procedure, tensioner torque specs, and alignment marks needed to perform this job correctly.
Are wiring diagrams and electrical schematics included?
Yes. Full electrical documentation is provided, covering ignition, KE-Jetronic fuel injection wiring, lighting circuits, dashboard instrumentation, power windows, and climate control. Connector pinouts, wire color codes, and ground locations are all detailed to support fault diagnosis on both GTB and GTS variants.
What format is the manual?
The manual is a PDF document delivered by instant download upon purchase. It is fully searchable, zoomable, and compatible with any PDF reader on Windows, Mac, Linux, iOS, or Android. Individual pages or complete sections can be printed for bench use.
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