Operation Section
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D24A Diesel Engine
Introduction
The D24A engine which is a high-power engine in compliance with the TIER4 Engine Emissions Standard is
provided with various systems. The D24A engine is equipped with a turbo-charger intercooler system that
compresses and cools air and feed it to the intake manifold. Here, AMF sensor and temperature/pressure
sensors detect the air condition and transmit the data to the ECU which controls fuel injection rate according
to the engine load, speed and air quantity. Fuel is supplied to a high pressure pump through a fuel filter. The
fuel compressed in the high pressure pump is transferred to common rail and injected by injectors in
controlled order. Surplus fuel after injection returns to the fuel tank via a return hose. The exhaust gas
recirculation (EGR) system controls the quantity of recirculating air according to the engine speed and load in
order to comply with applicable exhaust gas emission standards. The figure below shows the positions of the
electronic control system and sensors.
NOTICE
It is normal to hear a slight knocking or pinging sound from the Engine during operation.
This is the ECU regulating the amount of fuel necessary for fuel injection to meet emission standards.
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