Exam 7: Diesel Engine Cooling and Lubrication Systems

Technician A says the problem with new long-life antifreeze is it can produce silicate dropout, which plugs cooling system passages. Technician B says that the problem with some types of long-life antifreeze is that it is not compatible with all cooling system materials. Who is correct?

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?

Oils now need to be compatible with the latest:

Technician A says that raw or refined vegetable oils produce the least amount of harm when used in a diesel engine. Technician B says that water in the oil or a mechanical failure that produces internal debris are all circumstances that necessitate an oil change. Who is right?

In current diesel engines, the coolant must reach _____ to enable onboard diagnostic (OBD) monitors or any emission control strategy within a reasonable time.

What area of the API donut identifies the oil's viscosity, which is a standard defined by the SAE?

Increasing the pressure of the cooling system increases the coolant's:

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

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?

Which of the following is used as an additive by both new and old formulations of antifreeze for diesel engines to minimize cavitation erosion?

Technician A says that spin-on oil filters in metal cans are being eliminated because they are less convenient and messy. Technician B says that cartridge-type filters are becoming more commonly used to allow them to be more easily disposed in a more environmentally friendly way. Who is correct?

What is the maximum percentage of soot loading that means engine oil needs to be changed?

Which of the following will likely cause excessively high oil pressures?

The use of _______ can introduce more soot into the oil, which requires oil to be better able to dissolve and hold soot in the lubricating oil until it can be removed by the filter.

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

Technician A says that emission legislation and durability requirements impose new demands on the lubrication system. Technician B says that engine oil needs to be compatible with the latest exhaust aftertreatment systems. Who is right?

The oil quality sensor operates like a variable capacitor, using oil as the dielectric element measuring alternating current conductivity across the sensor at frequencies between:

What should be done to prevent hot oil from scalding hands when a spin-on filter is removed?

Ethylene glycol (EG) antifreeze is an environmental hazard; therefore, old antifreeze must be properly disposed of:

What color is hybrid organic acid technology (HOAT) antifreeze coolant used in Daimler-Chrysler engines?