Fiat 600 Repair Help: Learn How to Fix It Yourself.

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Author: oldturkey03 (and one other contributor)

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633cc "Tipo 100" Inline-4 (1955–1960): The original water-cooled engine produced 21.5 hp to 22 hp and 29 lb-ft of torque, pushing the car to a top speed of roughly 59 mph (95 km/h).
767cc "600D" Inline-4 (1960–1969): Displacement was increased to provide 29 hp and 36 lb-ft of torque, raising the top speed to 68 mph (110 km/h) to keep pace with modern traffic.
Cooling System: A rear-mounted radiator with a fan driven by the water pump; famously featured a vented engine lid (30 slots on early models, 36 on the 600D).

4-Speed Manual: A transaxle setup where the engine sits behind the rear axle. First gear was typically non-synchromesh (crash gear) on earlier models.
Rear-Wheel Drive: Direct drive to the rear wheels via swing axles, providing excellent traction but distinctive camber changes during cornering.
Clutch: Single dry-plate, cable-operated system noted for its light feel.

Suspension: Fully independent setup; the front used a transverse leaf spring that acted as a stabilizer bar, while the rear utilized coil springs and semi-trailing arms.
Braking: Four-wheel hydraulic drum brakes, which were sufficient for the vehicle’s low curb weight.
Body Styles: Available as a 2-door sedan, a "Transformable" with a folding cloth roof, and the cab-over Multipla which could seat six people by moving the driver over the front wheels.