Exam 7: Diesel Engine Cooling and Lubrication Systems

Many new engine designs use flow rate-controlled oil pumps or _______, which operate at either a high-pressure or low-pressure setting, depending on operating requirements.

The 15W in 15W-40 engine oil stands for which of the following?

Technician A says the oil-pressure regulator automatically reduces oil pressure at low-speed and low-load conditions. Technician B says that two-stage pressure regulation is performed electronically to reduce fuel consumption. Who is correct?

What series oils are designated for use in compression-ignition engines?

Which of the following conditions does NOT require the oil to be changed?

Technician A says that low-sulfur oil needs to be used today to prevent damage to exhaust aftertreatment systems. Technician B says that today's oils should have low ash content. Who is correct?

What percentage of the cost of a spin-on filter is in the steel canister and valves?

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

Technician A says that a drop in the coolant level in the surge tank or coolant overflow reservoir when the engine cools indicates an internal engine leak. Technician B says that the drop in the level is normal. Who is correct?

What has two different scales for measuring the freeze protection of PG and EG coolants?

Technician A says that a drop in the coolant level in the surge tank or coolant overflow reservoir when the engine cools indicates an internal engine leak. Technician B says that the drop in the level is normal. Who is correct?

Which of the following standards is designed for compatibility with biofuels and the latest exhaust aftertreatment systems?

Oil coolers have a(n) ________ for either coolant or oil, which will not allow oil cooling until the engine oil or coolant has reached operating temperature.

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

Diesel engine oil has which job of the following extra jobs to perform, which gasoline engines are not necessarily required to perform?

Which of the following ingredients is added to diesel engine coolant to prevent cavitation?

Cooling systems must deaerate the coolant to prevent the pumps and coolant passageways in the cylinder head from becoming:

Technician A says that the cooling system pressurizes to enable coolant to remove more heat from the engine. Technician B says pressurization is needed to keep the coolant from boiling. Who is correct?

What speeds up warm-up, when the engine is below its normal operating temperature, by blocking coolant flow from the engine to the radiator?

Technician A says that diesel engine oil turns black faster than oil in an SI engine because the oil composition and quality are different between the two oils. Technician B says that there is no difference between diesel engine and SI engine oil. Who is correct?