Only one AC3 was fully assembled, and that tank is currently preserved at the Australian War Memorial in Campbell, Australia. The Australian Cruiser Tank Mark III (AC3) powered by the Perrier-Cadillac 41-75 engine. It produced 135 hp (101 kW) and weighed around 890 lb (404 kg). The Cadillac 75 engine had a 3.5 in (89 mm) bore, a 4.5 in (114 mm) stroke, and a displacement of 346 cu in (5.7 L). The engine was designed to be built more economically than Cadillac’s V-12 and other V-8 engines. The V-8 also incorporated hydraulic valve lifters for durability. The engine was a monobloc design with cylinder banks cast integral with the crankcase. It was a flat head (side valve) engine with the intake and exhaust valves located on the Vee side of the cylinder. The Cadillac 75 engine had made its debut in 1936. The Australians referred to the engine as the Cadillac 75 because of its use in the Cadillac Series 75 sedan, but it was also used in the Series 70 and various Series 60 automobiles. A solution was found in the unlikely form of a Cadillac V-8 engine originally used to power various coupes and sedans. But a continuous supply of R-975 engines, Guiberson diesel engines, or any powerful engines could not be assured to Australia. The M3 was powered by a 400 hp (298 kW) Wright R-975 radial engine, built under license by Continental Motors. The AC1 Sentinel was based on the United States M3 medium tank, but selecting a power plant for the AC1 proved to be a challenge. All three drive shafts connect to the transfer box (bottom of image). The rear engine (top of image) is not visible, but its long drive shaft can be seen passing between the other two engines. The “clover leaf” Cadillac drive system of the Australian Cruiser Tank Mark I.
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