Exam 14: Servicing and Maintenance

What does the slang term wet service refer to in the context of a diesel engine?

Technician A says that it is good practice to refuel a diesel fueled truck with the engine running in cold weather. Technician B says that some modern diesel fuel systems may be under moderate pressure so care must be taken when removing the fill cap. Who is correct?

Technician A says that diesel fuel can be safely pumped at rates of up to 20 gallons per minute at a refueling station. Technician B says that a portable diesel fuel container must be lined with zinc to prevent degradation. Who is correct?

What is the estimated safe shelf life for storing diesel fuel?

What is the reason that accelerator pedal input may be disabled during cranking when temperatures drop below 32 degrees Fahrenheit (0 degrees Celsius)?

When draining collected water from the sump of a fuel/water separator, which of the following is recommended?

When a highway diesel engine DEF warning strategy defaults to trimback mode, what should be done?

What does the cross-hatched area marked between low and high levels on a commercial vehicle oil dipstick typically convert to in oil quantity?

When a diesel engine is operated exposed to dense grain chaff, which of the following devices can help extend air filter life?

What is the recommended minimum amount of time to allow an oil pan to drain after removing the sump plug?

Technician A says that some OEM dealerships recommend that oil samples be mailed in for laboratory testing. Technician B says that atomic emission spectrographic oil analysis can be performed in the service garage using Truck Check On-site analysis. Who is correct?

What is required to access the data bus and download data on a vehicle chassis?

Identify the organization responsible for classifying all engine oils sold in North America:

Technician A says that high detergent oils aerate more easily. Technician B says that high detergent oils should be used in engines equipped with a HEUI fuel system. Who is correct?

If a diesel engine is equipped with a diesel particulate filter (DPF) which of the following lube oil classifications must NOT be used?

Which type of diesel engine coolant is said to be able to last for the life of the engine?

When does a PG mix maximize its antifreeze protection?

When should the engine crankcase oil level be checked?

Identify the organization that sets the standards by which manufacturers grade engine oils by viscosity?

What is another way of saying air filter restriction gauge?