Chapter #14 - Servicing & Maintance
What does the cross-hatched area marked between low and high levels on a commercial vehicle oil dipstick typically convert to in oil quantity?
4 quarts
When does an EG to water mix maximise its antifreeze protection?
60:40 EG to water mix
Technician A says that adding kerosene to diesel fuel will enable faster cold starts during winter conditions without damaging the engine. Technician B says that an APU can reduce overall cranking time in sub-zero weather. Who is correct?
B only
Technician A says that the type of antifreeze can always be determined by its color. Technician B says that both PG and EG should be mixed with distilled water in order to maximize its service life. Who is correct?
B only
Technician A says that when a DPF is regenerated, any accummulated ash is burned off. Technician B says that when a DPF is regenerated, entrapped soot is burned off. Who is correct?
B only
If a diesel engine is equipped with a diesel particulate filter (DPF) which of the following lube oil classifications must be used?
CJ-4
What API oil classification is suitable for engines fueled by ultra low sulfur (ULS) fuel?
CJ-4
Which type of diesel engine coolant is said to be able to last for the life of the engine?
WEC
When a diesel engine is operated exposed to dense grain chaff, which of the following devices can help extend air filter life?
air filter pre-cleaner
Technician A says that some OEM dealerships recommend that oil samples be mailed in for laboratory testing. Technician B says that accurate spectrographic oil analysis can be performed in the service garage using Truck Check On-site analysis. Who is correct?
both A and B
Technician A says that some oil pan plugs on newer diesel engines only require a 1/4 turn to fully tighten. Technician B says that most oil pan sump plugs are removed and re-torqued using a 3/8-inch square socket drive. Who is correct?
both A and B
What is the reason that accelerator pedal input may be disabled during cranking when temperatures drop below 32 degrees Farenheit (0 degrees Celsius)?
cold start strategy
What is the usual OEM recommendation when installing secondary fuel filters?
install dry, then prime the fuel system
What is the main reason for the recommendation to thoroughly wash with soap and water after skin comes into contact with used engine oil?
it is a known carcinogen
Which of the following is good practice when breaking-in a new or recondtioned diesel engine?
load down the engine to seat rings
What is the recommended procedure when preparing an EG and distilled water coolant for installation into an engine?
mix EG and distilled water outside the radiator: pour into radiator as a mixture
What is the maximum amount of time biodiesel should be retained in a diesel engine fuel tank?
one month
When a highway diesel engine DEF warning strategy defaults to trimback mode, what should be done?
replenish the DEF tank
What is a synthetic oil likely to achieve when compared to a petroleum base diesel engine oil?
resistance to breakdown better tolerance to extreme temperatures extended service life
When draining collected water from the sump of a fuel/water separator, which of the following is recommended?
turn off the engine
