Ferrari Dino 308 GT4 (1973–1980) Workshop Manual (P/N 95990809)

• Covers Ferrari Dino 308 GT4 vehicles identified by the F106 AL chassis and F106 A V8 engine.
• Details engine diagnosis, internal inspection, reassembly, valve-shim and timing-belt work, ignition timing, Weber carburetor setting and synchronization, and bench running-in checks.
• Covers clutch adjustment, five-speed gearbox synchronizer inspection and assembly, limited-slip differential service, rack-and-pinion steering, suspension alignment, Koni shock absorber setting, and hydraulic brake bleeding.
• 209-page PDF identified as Part No. 95990809, Batch No. MP2158, with special-tool references, component-specific tightening-torque tables, electrical test data, air-conditioning diagnosis, body service, and emission-control sections.

Technical Coverage

The title and identification pages place this workshop manual specifically with the Ferrari Dino 308 GT4, chassis type F106 AL and engine type F106 A. The publication imprint identifies the printed edition as a MAR Parts Ltd. reprint for owners, issued after original factory stocks were exhausted.

The engine material goes well beyond routine maintenance. Fault charts cover starting, stalling, loss of power, misfiring, abnormal mechanical noise, vibration, and oil-pressure concerns. Internal repair coverage then moves through the crankcase and cylinder liners, pistons and connecting rods, crankshaft and main bearings, cylinder heads, valve guides and springs, camshafts, valve-clearance pads, toothed timing belts, final engine assembly, ignition timing, and bench running-in. The related tables supply fits, clearances, wear limits, balance checks, and tightening sequences for those assemblies.

Separate lubrication, cooling, and fuel-system sections cover oil-pump inspection, crankcase emission control, water-pump and belt checks, radiator and thermostat operation, cooling-system filling, electric fans, fuel-pump service, and the Weber 40 DCNF 35/36/37/38 carburetors. Carburetor coverage includes fault diagnosis, operating circuits, factory setting data, float-level work, throttle balance, synchronization, and cylinder-by-cylinder mixture checking.

The clutch chapter provides fault diagnosis and repair information for the mechanical control, release mechanism, flywheel, driven plate, and pressure plate. Gearbox coverage includes the five forward speeds and reverse, floating-ring synchronizers, gear and bearing inspection, synchronizer wear and load checks, internal assembly, and linkage adjustment. The rear-axle section covers the limited-slip differential, crown-and-pinion inspection, bearing preload, seals, and axle shafts. It also marks a critical production change: the differential used through gearbox No. 692 differs from the version fitted from gearbox No. 693, and the two are not interchangeable without the matching crown gear and gearbox layshaft.

Steering and suspension sections address rack-and-pinion diagnosis and clearance adjustment, front and rear wishbones, flexible bushings, ball joints, wheel bearings, camber, toe-in, caster, and wheel-setting checks. The Koni hydraulic shock absorber chapter explains compression and rebound operation, inspection, setting, and rating diagrams. Brake repair coverage includes the dual hydraulic circuits, calipers, servo, parking brake, system bleeding, pedal free travel, disc and pad inspection, and pad replacement. Wheel balancing, tire service, and fault charts are included as well.

Electrical coverage includes battery and alternator inspection, starter-motor diagnosis and maintenance, distributor synchronization, automatic-advance testing, ignition coils and spark plugs, retractable-headlamp service and alignment, radio installation, fuse and relay locations, wiring-diagram component legends, vehicle component identification, and cable-color references. The PDF includes fuse/relay and vehicle-component layouts plus the seat-belt warning circuit modification; the full-car foldout schematics themselves are not included.

The heating, ventilation, and air-conditioning chapters cover system-efficiency testing, pressure/temperature diagnosis, compressor and clutch service, evacuation, charging, leak checking, and belt adjustment. Body sections address doors, fixed and sliding glass, windshield and rear-window installation, the front hood and engine cover, bumpers, instrument panel, seats, upholstery, and paint repair. Structural chassis repair is outside the body procedure scope; the publication directs chassis operations to Ferrari service. Emission-control material covers carburetor and fast-idle adjustment, distributor microswitch operation, air-injection pumps and diverter valves, and the evaporative system with its three-way valve, activated-carbon trap, and liquid-vapor separator. The electrical supplement identifies a seat-belt warning-system change from car No. 10178.

Specification Highlights

Reference illustrations include the engine longitudinal and cross sections, camshaft-drive layout and timing-checking diagram, gearbox assembly section, serial-specific limited-slip differential section views, front and rear suspension cross sections, and the electrical component/fuse layout with the seat-belt warning circuit modification. The manual also provides special-tool part numbers for engine, clutch, gearbox, differential, steering, and suspension work, plus tightening-torque tables, capacities, alignment data, inspection limits, electrical test values, and air-conditioning diagnostic charts.

Several repair traps are made explicit. The timing-belt pulleys use different edge profiles and assigned camshaft positions; swapping them can force the belts off their intended track, damage the belt edges, and leave valve timing incorrectly indexed. The clutch driven plate is directional, and installing its hub toward the wrong side can prevent full release and damage the disc hub or adjacent clutch parts. The brake chapter also warns against gasoline, diesel fuel, and chlorinated cleaning solvents on caliper components because they can damage the hydraulic cylinder seals.

This material assumes advanced mechanical knowledge. Support the vehicle correctly, isolate electrical power, relieve hydraulic pressure, and use approved refrigerant equipment before brake, suspension, electrical, or air-conditioning repair.