Exam 7: Diesel Engine Cooling and Lubrication Systems

Antifreeze should be added to a minimum of ________ concentration because of the corrosion inhibitors it contains.

Which antifreeze will require the highest concentration to maintain 0°F (−18°C) freeze protection?

Technician A says that antifreeze is added to coolant to protect the coolant from freezing and to lower its boiling point. Technician B says antifreeze lowers the freeze point and raises the boiling point of coolant. Who is correct?

The "F" in FA-4 designates the oil as a(n):

Which of the following major lubrication system components does NOT function to meet durability requirements?

Technician A says that viscosity index (VI) improvers thicken oil when it becomes hot and thins it when it becomes cold. Technician B says that VI improvers thin oil when it's hot and thicken it when it's cold. Who is correct?

An oil analysis has been done and the results show a decrease in viscosity. Which of the following CANNOT be the cause?

Technician A says that blue antifreeze is long-life antifreeze. Technician B says that blue antifreeze is propylene glycol-based antifreeze. Who is correct?

Technician A says that antifreeze is added to coolant to protect the coolant from freezing and to lower its boiling point. Technician B says antifreeze lowers the freeze point and raises the boiling point of coolant. Who is correct?

Which of the following is the normal operating oil temperature of a diesel engine?

The lube oil is supplied under pressure to moving parts through drilled passageways in the engine called oil:

What is caused by the collapse of tiny water vapor bubbles formed when the coolant heats rapidly next to hot surfaces and/or when the coolant is subjected to a rapid drop in pressure?

A two-stage variable-displacement oil pump is being described. Technician A says that the space between the pump vanes is increased or decreased to change pump output volume. Technician B says that a hydraulic control valve rotates the ring against spring pressure to vary the space swept by the pump vanes. Who is right?

The presence of cavitation on the coolant side of the cylinder wall is most likely caused by __________.

Technician A says that many engines have experienced catastrophic oil-related failures subsequent to seemingly minor repairs when the oil has not been changed. Technician B says that engine oil change intervals may need to be shortened significantly if blends of biodiesel higher than B20 are used. Who is right?

Technician A says that the pressure rating of a radiator cap at which the pressure-relief valve opens is stamped on the radiator. Technician B says that a vacuum valve incorporated into the cap allows air or coolant to reenter the cooling system when the pressure drops after the engine cools. Who is right?

Which series of engine oils is used in a diesel engine?

Which of the following has imposed new demands on the lubrication system?

Two technicians are explaining the diesel engine lubrication system. Technician A says that it removes dirt, abrasives, and contaminants from inside the engine Technician B says the cooling system assists in sealing the combustion chamber by forming a film between the piston rings and the cylinder wall. Who is right?

Which of the following is the most recent engine oil made for a diesel engine?