WorksheetsDiesel Lubrication Systems
Total questions: 20
Worksheet time: 10mins
To minimize engine wear and the creation of heat, lubrication systems reduce __________ between moving engine parts.
A. Friction
B. Lubricity
C. Cushioning
D. Sealing
Technician A says that engine oils need to be compatible with the latest exhaust aftertreatment systems and biofuels. Technician B says aftertreatment systems do not play a role in the type of oil used in an engine. Who is correct?
A. Technician A
B. Technician B
C. Both Technician A and Technician B
D. Neither Technician A nor Technician B
Which of the following statements about lubrication systems is correct?
Lubrication systems assist sealing of the combustion chamber by forming a film between the piston rings and the cylinder wall.
Lubrication systems absorb shock loads between bearings and gears, thus cushioning and protecting engine parts while minimizing engine noise production.
Both A and B
Neither A nor B
Technician A says that at a microscopic level, highly polished metal surfaces are fairly smooth. Technician B says oil works by forming a separating film between parts to minimize direct contact between moving parts. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
When discussing lubrication systems, Technician A says that the lubrication system lubricates moving parts, but cannot remove heat from the engine. Technician B says part of the lubrication system's job is to minimize corrosion of internal engine parts. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
Which of the following statements about the benefits of synthetic oil is NOT correct?
Users of synthetic oil have claimed increases in their fuel mileage ranging from 3% to 8%.
There are longer intervals between oil changes due to higher resistance to oxidation.
There is greater resistance to chemical breakdown, oxidation, coking, and deposit formation.
There is reduced friction and engine wear because of a lower coefficient of friction.
Technician A says multi-grade oils are formulated with a feature to control viscosity change. Technician B says this change is measured by the viscosity index (VI), which refers to the change in oil viscosity with temperature. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
Motor oils are typically made up of what percentage of chemical additives?
10-15%
15-25%
20-30%
25-45%
Which of the following statements about common oil additives is correct?
Detergents and dispersants keep internal engine components clean and prevent thickening and sludging of oil.
Emulsifiers prevent water from combining with engine oil.
Corrosion and rust inhibitors protect engine parts against the effects of condensation.
All of these are correct.
Engine oil with the assigned S-series designate tells us it is __________.
Slippery
Used in spark-ignited engines
Used in single-cylinder engines
Used in sequential-fired engines
The oil pressure regulating valve is normally located in the outlet of the oil pump or in the __________.
Primary oil filter
Secondary oil filter
Main oil gallery
Engine's oil cooler
What is a symptom of a plugged engine oil cooler?
An increase in oil pressure when hot
A decrease in oil pressure when hot
No change in oil pressure
A cold engine oil operating temperature
What percentage of the cost of a spin-on filter is due to the steel canister and valves?
10%
20%
50%
80%
Which of the following is NOT a common contaminant that is removed by the oil filtration system?
Soot
Water
Sludge
Dirt
Oil pressure regulating valves operate by which force?
Oil temperature
Centrifugal force
Spring force
Engine RPM
Technician A says failing to service engine oil can dramatically shorten engine life and lead to catastrophic and costly component failures. Technician B says it is very uncommon for a technician to diagnose high oil consumption or excess engine oil in the crankcase or low oil pressure. Who is correct?
Technician A
Technician B
Both A and B
Neither A nor B
What is the best method to determine the location of an oil leak?
Tracing dye
Odor
Color
Texture
Which of the following statements about spin-on oil filters is NOT correct?
Oil filters on diesel engines are changed every time the oil is changed.
Some manufacturers even recommend changing the oil filters between oil changes if a vehicle uses conventional oil.
Both A and B
Neither A nor B
What is the maximum soot loading of engine oil?
2%
3.5%
7%
5-8%
Technician A says owners are motivated to sample engine oil to determine whether any oil properties are depleted. Technician B says engine oil needs to be changed even if oil properties are intact. Who is correct?
Technician A
Technician B
Both Technician A and Technician B
Neither Technician A nor Technician B
