Red Seal Heavy Duty Equipment Technician Practice Exam

Which of the following is not a main component of a diesel engine?

1. Fuel injector

2. Cylinder block

3. Torque converter

4. Piston

The correct answer is: Torque converter

In a diesel engine, the main components include the fuel injector, cylinder block, and piston, all of which are essential for the engine's operation. The fuel injector is responsible for delivering fuel into the combustion chamber at high pressure, allowing for efficient combustion. The cylinder block houses the cylinders where combustion occurs and provides structural integrity to the engine. The piston moves up and down within the cylinder, enabling the conversion of fuel energy into mechanical work. The torque converter, however, is not a main component of a diesel engine. Instead, it is a device typically found in automatic transmissions that allows for the transfer of power from the engine to the transmission. The torque converter uses fluid dynamics to enable smooth changes in torque and speed, but it does not directly contribute to the combustion process or the fundamental operation of a diesel engine. Thus, it stands out as the correct answer when identifying the component that is not fundamental to the workings of a diesel engine.