1982–1989 Ferrari 308 / 328 Quattrovalvole GTB GTS Service Manual (P/N 95990873)

• Official 115-page Ferrari OEM publication (Cat. 550/89, Cod. N. 95990873) covering the 1982–1989 Ferrari 308 Quattrovalvole, 328 GTB, and 328 GTS models.
• Documents the F 105 V8 engine family, detailing specific mechanical differences between the 308 and 328 series, including bore/stroke variations and gear ratios.
• Contains 40 exploded-view diagrams and 12 specification tables for engine, lubrication, cooling, and transmission systems.
• Covers essential mechanical components including the limited-slip differential, Lobro axle shafts, centrifugal water pump, gear-driven oil pump, gearbox synchronizers, expansion tank, and thermostat.
• Outlines inspection and assembly procedures for Nikasil cylinder liners, constant-contact thrust bearings, timing belt tensioners, valve springs, chassis hitch points, and Magnaflux crack inspections.

Technical Documentation Overview

This PDF service manual breaks down the mechanical systems of the F 105 V8, organized directly for professional workshop application. Having the exact factory tolerances grouped alongside the assembly sequence prevents costly machining errors during a complete drivetrain repair or routine troubleshooting. The documentation covers general vehicle identification, complete engine assembly, lubrication and cooling circuits, clutch configuration, and gearbox mechanicals. Working on high-performance Italian drivetrains requires strict precision. Always verify factory lifting points and secure the vehicle on approved jack stands before initiating any under-chassis inspections or fluid drains outlined in these chapters.

To properly support complex bench work, the text features specific visual aids, including engine cross-section views, lubrication circuit schematics, cooling system flow charts, valve timing diagrams, and gearbox internal control drawings.

Technical data is dense and highly specific. You will find complete parameters for cylinder head assembly, timing systems, and valve clearance adjustments. Instead of relying on expensive specialized dealerships, technicians can utilize the detailed procedures to independently set the precise timing belt tension using a Gates 150 tensiometer, dial in valve timing angles with a goniometer, and set the correct bearing preload on the differential. Need exact numbers? The manual lists the 308 Quattrovalvole displacement at 2926.9 cc with a 9.2:1 compression ratio. Peak torque for the 328 GTB/GTS is documented at 304 Nm at 5500 rpm. It also covers essential capacities, noting a 22-liter cooling system, and specifies vital internal tolerances, such as the F 105 main bearing assembly clearance of 0.029–0.064 mm.