Engine type: 4-stroke diesel
Number of cylinders: 6
Displacement: 11.84 liters (722 cubic inches)
Bore and stroke: 130 mm x 150 mm (5.12 in x 5.91 in)
Compression ratio: 16.6:1
Max power output: 459 kW (615 hp) @ 1,800 rpm
Max torque: 2,870 Nm (2,116 lb-ft) @ 1,500 rpm
Emissions compliance: Tier 1 (Non-road)
Cooling system: Liquid-cooled with pressurized radiator
Fuel system: Direct injection with high-pressure common rail
Lubrication system: Full-flow filtration with replaceable element and spin-on filter
Electrical system: 24-volt starting and charging system
Dry weight: 1,665 kg (3,670 lbs)
The engine model S12A2-Y1TAA1 is a variation of the S12A2 engine with a turbocharger, aftercooler, and air-to-air charge cooler. The engine model S12A2-PTA is another variation with a power take-off provision.
The part number 9237308 is often used in Komatsu equipment, such as the EX1900 excavator. Here are some specifications for the EX1900 with the S12A2 engine:
Operating weight: 190,000 kg (418,878 lbs)
Engine output: 463 kW (620 hp) @ 1,800 rpm
Max torque: 2,815 Nm (2,076 lb-ft) @ 1,500 rpm
Bucket capacity: 15.0 - 19.0 m³ (19.6 - 24.8 yd³)
Max digging depth: 8.06 m (26 ft 5 in)
