Oil System Flashcards
How does an oil coooler provided cooling capabilities?
It is exposed to the airflow
What part of the oil system is exposed to the airflow?
Oil coooler
How is oil viscosity affected by temperature?
High temperatures reduce viscosity
What viscosity is preferred in especially cold operations?
Low viscosity
Where does oil gather after doing work in the engine?
The sump
What is a wet sump engine?
A sump that stores oil
What is a dry sump engine?
Scavenge pumps draw oil from sump and baack to the oil tank
What alleviates high oil pressure?
Oil pressure relief valve
Where does an oil pressure gauge sit in the oil system?
After the pump and before the engine
What instrument sits after the oil pump and before the enginee?
Oil pressure gauge
What type of gauge is often used for oil pressure?
Bourdon tube gauge
In a dry sump system, what are required to ensure the oil tank receives oil?
Scavenge pumps
Where does an oil temp gauge sit in the oil system?
After the cooler and before the hot sections of the engine
What instrument sits after the cooler and before the hot sections of the engine?
Oil temp gauge
Of oil temp and pressure, what changes more gradually?
Oil temperature
When reading oil temp and pressure, what gauge will adjust more quickly?
Oil pressure
What is indicated by these symptoms:
Clogged oil line
Low quantity of oil
Malfunctioning temp gauge
High oil temperature
High oil temperature may be a result of what major issue?
Low quantity of oil
What is indicated by these issues:
Incorrect type of oil being used
Low oil temperature
Low oil temperature indicates what?
Incorrect type of oil being used for cold weather
How does a Bourdon tube gauge measure oil temperature?
Heated oil produces vapour
As temp increases, vapour pressure increases
Bourdon tube expands as vapour pressure rises (and vice versa)
What substance does a Bourdon tube gauge rely on in measuring oil temp?
Oil vapour
In relation to Bourdon tube gauges, what does oil produce when heated?
Vapour
What is the principle of an electrical resistance thermometer?
Resistance increases as temperature increass
An electrical oil thermometer reads oil temperature instead of what?
Resistance (ohms)
What chemical changes does oil undergo over an operational period?
Oxidation and water absorption
What consideration should be taken for oil when running in a new engine?
Straight oil should be used
How are Ts and Ps affected if oil quantity is too low?
Ts are high and Ps are low
Of all the Ts and Ps readings, what necessitates an emergency response?
Low oil pressure
What usually accompanies a low oil pressure reading?
High oil temperature
Aside from low oil quantity, what else might cause a high oil temperature reading?
Prolonged operation at excessive CHTs
If climbing with high power and low airspeed, what might happen to Ts and Ps?
High oil temperature
How could a low oil pressure reading be assumed to be faulty?
If oil temperature remains normal
What issue would give a constant oil pressure reading but a rising oil temperature?
Gradual loss of oil
A gradual loss of oil will have what effect on Ts and Ps?
Ts will rise, Ps will remain constant until oil is at critical level at which point Ps will suddenly drop
